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New `needle_map.CompactMap()` implementation for reduced memory usage (#6842)
New `needle_map.CompactMap()` implementation for reduced memory usage (#6842)
* Rework `needle_map.CompactMap()` to maximize memory efficiency. * Use a memory-efficient structure for `CompactMap` needle value entries. This slightly complicates the code, but makes a **massive** difference in memory efficiency - preliminary results show a ~30% reduction in heap usage, with no measurable performance impact otherwise. * Clean up type for `CompactMap` chunk IDs. * Add a small comment description for `CompactMap()`. * Add the old version of `CompactMap()` for comparison purposes.pull/6714/merge
Lisandro Pin
4 days ago
committed by
GitHub
GitHub
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
7 changed files with 1298 additions and 439 deletions
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476weed/storage/needle_map/compact_map.go
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5weed/storage/needle_map/compact_map_cases_test.go
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1weed/storage/needle_map/compact_map_perf_test.go
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588weed/storage/needle_map/compact_map_test.go
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332weed/storage/needle_map/old/compact_map.go
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92weed/storage/needle_map/old/compact_map_perf_test.go
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243weed/storage/needle_map/old/compact_map_test.go
@ -1,330 +1,284 @@ |
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package needle_map |
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/* CompactMap is an in-memory map of needle indeces, optimized for memory usage. |
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* |
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* It's implemented as a map of sorted indeces segments, which are in turn accessed through binary |
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* search. This guarantees a best-case scenario (ordered inserts/updates) of O(N) and a worst case |
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* scenario of O(log n) runtime, with memory usage unaffected by insert ordering. |
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* |
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* Note that even at O(log n), the clock time for both reads and writes is very low, so CompactMap |
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* will seldom bottleneck index operations. |
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*/ |
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|
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import ( |
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"fmt" |
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"math" |
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"slices" |
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"sort" |
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"sync" |
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|
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. "github.com/seaweedfs/seaweedfs/weed/storage/types" |
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"github.com/seaweedfs/seaweedfs/weed/storage/types" |
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) |
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|
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const ( |
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MaxSectionBucketSize = 1024 * 8 |
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LookBackWindowSize = 1024 // how many entries to look back when inserting into a section
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MaxCompactKey = math.MaxUint16 |
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SegmentChunkSize = 50000 // should be <= MaxCompactKey
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) |
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type SectionalNeedleId uint32 |
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const SectionalNeedleIdLimit = 1<<32 - 1 |
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type CompactKey uint16 |
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type CompactOffset [types.OffsetSize]byte |
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type CompactNeedleValue struct { |
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key CompactKey |
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offset CompactOffset |
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size types.Size |
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} |
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type SectionalNeedleValue struct { |
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Key SectionalNeedleId |
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OffsetLower OffsetLower `comment:"Volume offset"` //since aligned to 8 bytes, range is 4G*8=32G
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Size Size `comment:"Size of the data portion"` |
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OffsetHigher OffsetHigher |
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type Chunk uint64 |
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type CompactMapSegment struct { |
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list []CompactNeedleValue |
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chunk Chunk |
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firstKey CompactKey |
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lastKey CompactKey |
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} |
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|
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type CompactSection struct { |
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type CompactMap struct { |
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sync.RWMutex |
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values []SectionalNeedleValue |
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overflow Overflow |
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start NeedleId |
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end NeedleId |
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segments map[Chunk]*CompactMapSegment |
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} |
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type Overflow []SectionalNeedleValue |
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func (ck CompactKey) Key(chunk Chunk) types.NeedleId { |
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return (types.NeedleId(SegmentChunkSize) * types.NeedleId(chunk)) + types.NeedleId(ck) |
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} |
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|
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func NewCompactSection(start NeedleId) *CompactSection { |
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return &CompactSection{ |
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values: make([]SectionalNeedleValue, 0), |
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overflow: Overflow(make([]SectionalNeedleValue, 0)), |
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start: start, |
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} |
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func OffsetToCompact(offset types.Offset) CompactOffset { |
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var co CompactOffset |
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types.OffsetToBytes(co[:], offset) |
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return co |
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} |
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// return old entry size
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func (cs *CompactSection) Set(key NeedleId, offset Offset, size Size) (oldOffset Offset, oldSize Size) { |
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cs.Lock() |
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defer cs.Unlock() |
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func (co CompactOffset) Offset() types.Offset { |
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return types.BytesToOffset(co[:]) |
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} |
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|
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if key > cs.end { |
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cs.end = key |
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} |
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skey := SectionalNeedleId(key - cs.start) |
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if i := cs.binarySearchValues(skey); i >= 0 { |
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// update
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oldOffset.OffsetHigher, oldOffset.OffsetLower, oldSize = cs.values[i].OffsetHigher, cs.values[i].OffsetLower, cs.values[i].Size |
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cs.values[i].OffsetHigher, cs.values[i].OffsetLower, cs.values[i].Size = offset.OffsetHigher, offset.OffsetLower, size |
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return |
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func (cnv CompactNeedleValue) NeedleValue(chunk Chunk) NeedleValue { |
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return NeedleValue{ |
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Key: cnv.key.Key(chunk), |
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Offset: cnv.offset.Offset(), |
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Size: cnv.size, |
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} |
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} |
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|
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var lkey SectionalNeedleId |
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if len(cs.values) > 0 { |
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lkey = cs.values[len(cs.values)-1].Key |
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func newCompactMapSegment(chunk Chunk) *CompactMapSegment { |
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return &CompactMapSegment{ |
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list: []CompactNeedleValue{}, |
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chunk: chunk, |
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firstKey: MaxCompactKey, |
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lastKey: 0, |
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} |
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} |
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hasAdded := false |
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switch { |
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case len(cs.values) < MaxSectionBucketSize && lkey <= skey: |
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// non-overflow insert
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cs.values = append(cs.values, SectionalNeedleValue{ |
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Key: skey, |
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OffsetLower: offset.OffsetLower, |
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Size: size, |
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OffsetHigher: offset.OffsetHigher, |
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}) |
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hasAdded = true |
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case len(cs.values) < MaxSectionBucketSize: |
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// still has capacity and only partially out of order
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lookBackIndex := len(cs.values) - LookBackWindowSize |
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if lookBackIndex < 0 { |
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lookBackIndex = 0 |
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} |
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if cs.values[lookBackIndex].Key <= skey { |
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for ; lookBackIndex < len(cs.values); lookBackIndex++ { |
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if cs.values[lookBackIndex].Key >= skey { |
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break |
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} |
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} |
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cs.values = append(cs.values, SectionalNeedleValue{}) |
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copy(cs.values[lookBackIndex+1:], cs.values[lookBackIndex:]) |
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cs.values[lookBackIndex].Key, cs.values[lookBackIndex].Size = skey, size |
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cs.values[lookBackIndex].OffsetLower, cs.values[lookBackIndex].OffsetHigher = offset.OffsetLower, offset.OffsetHigher |
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hasAdded = true |
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} |
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} |
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func (cs *CompactMapSegment) len() int { |
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return len(cs.list) |
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} |
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// overflow insert
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if !hasAdded { |
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if oldValue, found := cs.findOverflowEntry(skey); found { |
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oldOffset.OffsetHigher, oldOffset.OffsetLower, oldSize = oldValue.OffsetHigher, oldValue.OffsetLower, oldValue.Size |
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} |
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cs.setOverflowEntry(skey, offset, size) |
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} else { |
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// if we maxed out our values bucket, pin its capacity to minimize memory usage
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if len(cs.values) == MaxSectionBucketSize { |
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bucket := make([]SectionalNeedleValue, len(cs.values)) |
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copy(bucket, cs.values) |
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cs.values = bucket |
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} |
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} |
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func (cs *CompactMapSegment) cap() int { |
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return cap(cs.list) |
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} |
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return |
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func (cs *CompactMapSegment) compactKey(key types.NeedleId) CompactKey { |
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return CompactKey(key - (types.NeedleId(SegmentChunkSize) * types.NeedleId(cs.chunk))) |
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} |
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func (cs *CompactSection) setOverflowEntry(skey SectionalNeedleId, offset Offset, size Size) { |
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needleValue := SectionalNeedleValue{Key: skey, OffsetLower: offset.OffsetLower, Size: size, OffsetHigher: offset.OffsetHigher} |
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insertCandidate := sort.Search(len(cs.overflow), func(i int) bool { |
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return cs.overflow[i].Key >= needleValue.Key |
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}) |
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// bsearchKey returns the CompactNeedleValue index for a given ID key.
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// If the key is not found, it returns the index where it should be inserted instead.
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func (cs *CompactMapSegment) bsearchKey(key types.NeedleId) (int, bool) { |
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ck := cs.compactKey(key) |
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if insertCandidate != len(cs.overflow) && cs.overflow[insertCandidate].Key == needleValue.Key { |
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cs.overflow[insertCandidate] = needleValue |
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return |
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switch { |
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case len(cs.list) == 0: |
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return 0, false |
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case ck == cs.firstKey: |
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return 0, true |
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case ck <= cs.firstKey: |
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return 0, false |
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case ck == cs.lastKey: |
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return len(cs.list) - 1, true |
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case ck > cs.lastKey: |
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return len(cs.list), false |
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} |
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cs.overflow = append(cs.overflow, SectionalNeedleValue{}) |
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copy(cs.overflow[insertCandidate+1:], cs.overflow[insertCandidate:]) |
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cs.overflow[insertCandidate] = needleValue |
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} |
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func (cs *CompactSection) findOverflowEntry(key SectionalNeedleId) (nv SectionalNeedleValue, found bool) { |
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foundCandidate := sort.Search(len(cs.overflow), func(i int) bool { |
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return cs.overflow[i].Key >= key |
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i := sort.Search(len(cs.list), func(i int) bool { |
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return cs.list[i].key >= ck |
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}) |
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if foundCandidate != len(cs.overflow) && cs.overflow[foundCandidate].Key == key { |
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return cs.overflow[foundCandidate], true |
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} |
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return nv, false |
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return i, cs.list[i].key == ck |
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} |
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func (cs *CompactSection) deleteOverflowEntry(key SectionalNeedleId) { |
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length := len(cs.overflow) |
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deleteCandidate := sort.Search(length, func(i int) bool { |
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return cs.overflow[i].Key >= key |
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}) |
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if deleteCandidate != length && cs.overflow[deleteCandidate].Key == key { |
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if cs.overflow[deleteCandidate].Size.IsValid() { |
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cs.overflow[deleteCandidate].Size = -cs.overflow[deleteCandidate].Size |
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} |
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// set inserts/updates a CompactNeedleValue.
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// If the operation is an update, returns the overwritten value's previous offset and size.
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func (cs *CompactMapSegment) set(key types.NeedleId, offset types.Offset, size types.Size) (oldOffset types.Offset, oldSize types.Size) { |
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i, found := cs.bsearchKey(key) |
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if found { |
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// update
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o := cs.list[i].offset.Offset() |
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oldOffset.OffsetLower = o.OffsetLower |
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oldOffset.OffsetHigher = o.OffsetHigher |
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oldSize = cs.list[i].size |
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o.OffsetLower = offset.OffsetLower |
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o.OffsetHigher = offset.OffsetHigher |
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cs.list[i].offset = OffsetToCompact(o) |
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cs.list[i].size = size |
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return |
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} |
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} |
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// return old entry size
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func (cs *CompactSection) Delete(key NeedleId) Size { |
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cs.Lock() |
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defer cs.Unlock() |
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ret := Size(0) |
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if key > cs.end { |
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return ret |
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// insert
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if len(cs.list) >= SegmentChunkSize { |
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panic(fmt.Sprintf("attempted to write more than %d entries on CompactMapSegment %p!!!", SegmentChunkSize, cs)) |
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} |
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skey := SectionalNeedleId(key - cs.start) |
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if i := cs.binarySearchValues(skey); i >= 0 { |
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if cs.values[i].Size > 0 && cs.values[i].Size.IsValid() { |
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ret = cs.values[i].Size |
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cs.values[i].Size = -cs.values[i].Size |
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} |
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if len(cs.list) == SegmentChunkSize-1 { |
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// if we max out our segment storage, pin its capacity to minimize memory usage
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nl := make([]CompactNeedleValue, SegmentChunkSize, SegmentChunkSize) |
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copy(nl, cs.list[:i]) |
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copy(nl[i+1:], cs.list[i:]) |
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cs.list = nl |
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} else { |
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cs.list = append(cs.list, CompactNeedleValue{}) |
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copy(cs.list[i+1:], cs.list[i:]) |
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} |
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if v, found := cs.findOverflowEntry(skey); found { |
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cs.deleteOverflowEntry(skey) |
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ret = v.Size |
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ck := cs.compactKey(key) |
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cs.list[i] = CompactNeedleValue{ |
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key: ck, |
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offset: OffsetToCompact(offset), |
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size: size, |
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} |
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return ret |
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} |
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func (cs *CompactSection) Get(key NeedleId) (*NeedleValue, bool) { |
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cs.RLock() |
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defer cs.RUnlock() |
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if key > cs.end { |
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return nil, false |
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if ck < cs.firstKey { |
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cs.firstKey = ck |
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} |
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skey := SectionalNeedleId(key - cs.start) |
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if v, ok := cs.findOverflowEntry(skey); ok { |
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nv := toNeedleValue(v, cs) |
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return &nv, true |
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if ck > cs.lastKey { |
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cs.lastKey = ck |
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} |
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if i := cs.binarySearchValues(skey); i >= 0 { |
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nv := toNeedleValue(cs.values[i], cs) |
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return &nv, true |
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return |
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} |
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// get seeks a map entry by key. Returns an entry pointer, with a boolean specifiying if the entry was found.
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func (cs *CompactMapSegment) get(key types.NeedleId) (*CompactNeedleValue, bool) { |
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if i, found := cs.bsearchKey(key); found { |
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return &cs.list[i], true |
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} |
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return nil, false |
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} |
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func (cs *CompactSection) binarySearchValues(key SectionalNeedleId) int { |
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x := sort.Search(len(cs.values), func(i int) bool { |
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return cs.values[i].Key >= key |
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}) |
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if x >= len(cs.values) { |
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return -1 |
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} |
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if cs.values[x].Key > key { |
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return -2 |
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// delete deletes a map entry by key. Returns the entries' previous Size, if available.
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func (cs *CompactMapSegment) delete(key types.NeedleId) types.Size { |
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if i, found := cs.bsearchKey(key); found { |
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if cs.list[i].size > 0 && cs.list[i].size.IsValid() { |
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ret := cs.list[i].size |
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cs.list[i].size = -cs.list[i].size |
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return ret |
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} |
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} |
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return x |
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} |
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// This map assumes mostly inserting increasing keys
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// This map assumes mostly inserting increasing keys
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type CompactMap struct { |
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list []*CompactSection |
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return types.Size(0) |
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} |
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func NewCompactMap() *CompactMap { |
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return &CompactMap{} |
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return &CompactMap{ |
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segments: map[Chunk]*CompactMapSegment{}, |
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} |
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} |
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func (cm *CompactMap) Set(key NeedleId, offset Offset, size Size) (oldOffset Offset, oldSize Size) { |
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x := cm.binarySearchCompactSection(key) |
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if x < 0 || (key-cm.list[x].start) > SectionalNeedleIdLimit { |
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// println(x, "adding to existing", len(cm.list), "sections, starting", key)
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cs := NewCompactSection(key) |
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cm.list = append(cm.list, cs) |
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x = len(cm.list) - 1 |
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//keep compact section sorted by start
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for x >= 0 { |
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if x > 0 && cm.list[x-1].start > key { |
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cm.list[x] = cm.list[x-1] |
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// println("shift", x, "start", cs.start, "to", x-1)
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x = x - 1 |
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} else { |
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cm.list[x] = cs |
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// println("cs", x, "start", cs.start)
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break |
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} |
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} |
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func (cm *CompactMap) Len() int { |
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l := 0 |
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for _, s := range cm.segments { |
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l += s.len() |
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} |
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// println(key, "set to section[", x, "].start", cm.list[x].start)
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return cm.list[x].Set(key, offset, size) |
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return l |
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} |
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func (cm *CompactMap) Delete(key NeedleId) Size { |
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x := cm.binarySearchCompactSection(key) |
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if x < 0 { |
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return Size(0) |
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func (cm *CompactMap) Cap() int { |
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c := 0 |
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for _, s := range cm.segments { |
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c += s.cap() |
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} |
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return cm.list[x].Delete(key) |
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return c |
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} |
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func (cm *CompactMap) Get(key NeedleId) (*NeedleValue, bool) { |
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x := cm.binarySearchCompactSection(key) |
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if x < 0 { |
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return nil, false |
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func (cm *CompactMap) String() string { |
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if cm.Len() == 0 { |
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return "empty" |
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} |
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return cm.list[x].Get(key) |
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return fmt.Sprintf( |
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"%d/%d elements on %d segments, %.02f%% efficiency", |
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cm.Len(), cm.Cap(), len(cm.segments), |
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float64(100)*float64(cm.Len())/float64(cm.Cap())) |
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} |
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func (cm *CompactMap) binarySearchCompactSection(key NeedleId) int { |
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l, h := 0, len(cm.list)-1 |
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if h < 0 { |
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return -5 |
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} |
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if cm.list[h].start <= key { |
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if len(cm.list[h].values) < MaxSectionBucketSize || key <= cm.list[h].end { |
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return h |
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} |
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return -4 |
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|
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func (cm *CompactMap) segmentForKey(key types.NeedleId) *CompactMapSegment { |
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chunk := Chunk(key / SegmentChunkSize) |
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if cs, ok := cm.segments[chunk]; ok { |
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return cs |
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} |
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for l <= h { |
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m := (l + h) / 2 |
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if key < cm.list[m].start { |
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h = m - 1 |
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} else { // cm.list[m].start <= key
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if cm.list[m+1].start <= key { |
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l = m + 1 |
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} else { |
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return m |
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} |
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} |
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|
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cs := newCompactMapSegment(chunk) |
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cm.segments[chunk] = cs |
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return cs |
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} |
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|
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// Set inserts/updates a NeedleValue.
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// If the operation is an update, returns the overwritten value's previous offset and size.
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func (cm *CompactMap) Set(key types.NeedleId, offset types.Offset, size types.Size) (oldOffset types.Offset, oldSize types.Size) { |
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cm.RLock() |
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defer cm.RUnlock() |
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|
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cs := cm.segmentForKey(key) |
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return cs.set(key, offset, size) |
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} |
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|
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// Get seeks a map entry by key. Returns an entry pointer, with a boolean specifiying if the entry was found.
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func (cm *CompactMap) Get(key types.NeedleId) (*NeedleValue, bool) { |
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cm.RLock() |
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defer cm.RUnlock() |
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|
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cs := cm.segmentForKey(key) |
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if cnv, found := cs.get(key); found { |
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nv := cnv.NeedleValue(cs.chunk) |
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return &nv, true |
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} |
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return -3 |
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return nil, false |
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} |
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|
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// Visit visits all entries or stop if any error when visiting
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// Delete deletes a map entry by key. Returns the entries' previous Size, if available.
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func (cm *CompactMap) Delete(key types.NeedleId) types.Size { |
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cm.RLock() |
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defer cm.RUnlock() |
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|
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cs := cm.segmentForKey(key) |
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return cs.delete(key) |
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} |
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|
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// AscendingVisit runs a function on all entries, in ascending key order. Returns any errors hit while visiting.
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func (cm *CompactMap) AscendingVisit(visit func(NeedleValue) error) error { |
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for _, cs := range cm.list { |
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cs.RLock() |
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var i, j int |
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for i, j = 0, 0; i < len(cs.overflow) && j < len(cs.values); { |
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if cs.overflow[i].Key < cs.values[j].Key { |
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if err := visit(toNeedleValue(cs.overflow[i], cs)); err != nil { |
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cs.RUnlock() |
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return err |
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} |
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i++ |
|||
} else if cs.overflow[i].Key == cs.values[j].Key { |
|||
j++ |
|||
} else { |
|||
if err := visit(toNeedleValue(cs.values[j], cs)); err != nil { |
|||
cs.RUnlock() |
|||
return err |
|||
} |
|||
j++ |
|||
} |
|||
} |
|||
for ; i < len(cs.overflow); i++ { |
|||
if err := visit(toNeedleValue(cs.overflow[i], cs)); err != nil { |
|||
cs.RUnlock() |
|||
return err |
|||
} |
|||
} |
|||
for ; j < len(cs.values); j++ { |
|||
if err := visit(toNeedleValue(cs.values[j], cs)); err != nil { |
|||
cs.RUnlock() |
|||
cm.RLock() |
|||
defer cm.RUnlock() |
|||
|
|||
chunks := []Chunk{} |
|||
for c := range cm.segments { |
|||
chunks = append(chunks, c) |
|||
} |
|||
slices.Sort(chunks) |
|||
|
|||
for _, c := range chunks { |
|||
cs := cm.segments[c] |
|||
for _, cnv := range cs.list { |
|||
nv := cnv.NeedleValue(cs.chunk) |
|||
if err := visit(nv); err != nil { |
|||
return err |
|||
} |
|||
} |
|||
cs.RUnlock() |
|||
} |
|||
return nil |
|||
} |
|||
|
|||
func toNeedleValue(snv SectionalNeedleValue, cs *CompactSection) NeedleValue { |
|||
offset := Offset{ |
|||
OffsetHigher: snv.OffsetHigher, |
|||
OffsetLower: snv.OffsetLower, |
|||
} |
|||
return NeedleValue{Key: NeedleId(snv.Key) + cs.start, Offset: offset, Size: snv.Size} |
|||
} |
|||
|
|||
func (nv NeedleValue) toSectionalNeedleValue(cs *CompactSection) SectionalNeedleValue { |
|||
return SectionalNeedleValue{ |
|||
Key: SectionalNeedleId(nv.Key - cs.start), |
|||
OffsetLower: nv.Offset.OffsetLower, |
|||
Size: nv.Size, |
|||
OffsetHigher: nv.Offset.OffsetHigher, |
|||
} |
|||
} |
|||
@ -0,0 +1,332 @@ |
|||
package needle_map |
|||
|
|||
import ( |
|||
"sort" |
|||
"sync" |
|||
|
|||
. "github.com/seaweedfs/seaweedfs/weed/storage/types" |
|||
|
|||
new_map "github.com/seaweedfs/seaweedfs/weed/storage/needle_map" |
|||
) |
|||
|
|||
const ( |
|||
MaxSectionBucketSize = 1024 * 8 |
|||
LookBackWindowSize = 1024 // how many entries to look back when inserting into a section
|
|||
) |
|||
|
|||
type SectionalNeedleId uint32 |
|||
|
|||
const SectionalNeedleIdLimit = 1<<32 - 1 |
|||
|
|||
type SectionalNeedleValue struct { |
|||
Key SectionalNeedleId |
|||
OffsetLower OffsetLower `comment:"Volume offset"` //since aligned to 8 bytes, range is 4G*8=32G
|
|||
Size Size `comment:"Size of the data portion"` |
|||
OffsetHigher OffsetHigher |
|||
} |
|||
|
|||
type CompactSection struct { |
|||
sync.RWMutex |
|||
values []SectionalNeedleValue |
|||
overflow Overflow |
|||
start NeedleId |
|||
end NeedleId |
|||
} |
|||
|
|||
type Overflow []SectionalNeedleValue |
|||
|
|||
func NewCompactSection(start NeedleId) *CompactSection { |
|||
return &CompactSection{ |
|||
values: make([]SectionalNeedleValue, 0), |
|||
overflow: Overflow(make([]SectionalNeedleValue, 0)), |
|||
start: start, |
|||
} |
|||
} |
|||
|
|||
// return old entry size
|
|||
func (cs *CompactSection) Set(key NeedleId, offset Offset, size Size) (oldOffset Offset, oldSize Size) { |
|||
cs.Lock() |
|||
defer cs.Unlock() |
|||
|
|||
if key > cs.end { |
|||
cs.end = key |
|||
} |
|||
skey := SectionalNeedleId(key - cs.start) |
|||
if i := cs.binarySearchValues(skey); i >= 0 { |
|||
// update
|
|||
oldOffset.OffsetHigher, oldOffset.OffsetLower, oldSize = cs.values[i].OffsetHigher, cs.values[i].OffsetLower, cs.values[i].Size |
|||
cs.values[i].OffsetHigher, cs.values[i].OffsetLower, cs.values[i].Size = offset.OffsetHigher, offset.OffsetLower, size |
|||
return |
|||
} |
|||
|
|||
var lkey SectionalNeedleId |
|||
if len(cs.values) > 0 { |
|||
lkey = cs.values[len(cs.values)-1].Key |
|||
} |
|||
|
|||
hasAdded := false |
|||
switch { |
|||
case len(cs.values) < MaxSectionBucketSize && lkey <= skey: |
|||
// non-overflow insert
|
|||
cs.values = append(cs.values, SectionalNeedleValue{ |
|||
Key: skey, |
|||
OffsetLower: offset.OffsetLower, |
|||
Size: size, |
|||
OffsetHigher: offset.OffsetHigher, |
|||
}) |
|||
hasAdded = true |
|||
case len(cs.values) < MaxSectionBucketSize: |
|||
// still has capacity and only partially out of order
|
|||
lookBackIndex := len(cs.values) - LookBackWindowSize |
|||
if lookBackIndex < 0 { |
|||
lookBackIndex = 0 |
|||
} |
|||
if cs.values[lookBackIndex].Key <= skey { |
|||
for ; lookBackIndex < len(cs.values); lookBackIndex++ { |
|||
if cs.values[lookBackIndex].Key >= skey { |
|||
break |
|||
} |
|||
} |
|||
cs.values = append(cs.values, SectionalNeedleValue{}) |
|||
copy(cs.values[lookBackIndex+1:], cs.values[lookBackIndex:]) |
|||
cs.values[lookBackIndex].Key, cs.values[lookBackIndex].Size = skey, size |
|||
cs.values[lookBackIndex].OffsetLower, cs.values[lookBackIndex].OffsetHigher = offset.OffsetLower, offset.OffsetHigher |
|||
hasAdded = true |
|||
} |
|||
} |
|||
|
|||
// overflow insert
|
|||
if !hasAdded { |
|||
if oldValue, found := cs.findOverflowEntry(skey); found { |
|||
oldOffset.OffsetHigher, oldOffset.OffsetLower, oldSize = oldValue.OffsetHigher, oldValue.OffsetLower, oldValue.Size |
|||
} |
|||
cs.setOverflowEntry(skey, offset, size) |
|||
} else { |
|||
// if we maxed out our values bucket, pin its capacity to minimize memory usage
|
|||
if len(cs.values) == MaxSectionBucketSize { |
|||
bucket := make([]SectionalNeedleValue, len(cs.values)) |
|||
copy(bucket, cs.values) |
|||
cs.values = bucket |
|||
} |
|||
} |
|||
|
|||
return |
|||
} |
|||
|
|||
func (cs *CompactSection) setOverflowEntry(skey SectionalNeedleId, offset Offset, size Size) { |
|||
needleValue := SectionalNeedleValue{Key: skey, OffsetLower: offset.OffsetLower, Size: size, OffsetHigher: offset.OffsetHigher} |
|||
insertCandidate := sort.Search(len(cs.overflow), func(i int) bool { |
|||
return cs.overflow[i].Key >= needleValue.Key |
|||
}) |
|||
|
|||
if insertCandidate != len(cs.overflow) && cs.overflow[insertCandidate].Key == needleValue.Key { |
|||
cs.overflow[insertCandidate] = needleValue |
|||
return |
|||
} |
|||
|
|||
cs.overflow = append(cs.overflow, SectionalNeedleValue{}) |
|||
copy(cs.overflow[insertCandidate+1:], cs.overflow[insertCandidate:]) |
|||
cs.overflow[insertCandidate] = needleValue |
|||
} |
|||
|
|||
func (cs *CompactSection) findOverflowEntry(key SectionalNeedleId) (nv SectionalNeedleValue, found bool) { |
|||
foundCandidate := sort.Search(len(cs.overflow), func(i int) bool { |
|||
return cs.overflow[i].Key >= key |
|||
}) |
|||
if foundCandidate != len(cs.overflow) && cs.overflow[foundCandidate].Key == key { |
|||
return cs.overflow[foundCandidate], true |
|||
} |
|||
return nv, false |
|||
} |
|||
|
|||
func (cs *CompactSection) deleteOverflowEntry(key SectionalNeedleId) { |
|||
length := len(cs.overflow) |
|||
deleteCandidate := sort.Search(length, func(i int) bool { |
|||
return cs.overflow[i].Key >= key |
|||
}) |
|||
if deleteCandidate != length && cs.overflow[deleteCandidate].Key == key { |
|||
if cs.overflow[deleteCandidate].Size.IsValid() { |
|||
cs.overflow[deleteCandidate].Size = -cs.overflow[deleteCandidate].Size |
|||
} |
|||
} |
|||
} |
|||
|
|||
// return old entry size
|
|||
func (cs *CompactSection) Delete(key NeedleId) Size { |
|||
cs.Lock() |
|||
defer cs.Unlock() |
|||
ret := Size(0) |
|||
if key > cs.end { |
|||
return ret |
|||
} |
|||
skey := SectionalNeedleId(key - cs.start) |
|||
if i := cs.binarySearchValues(skey); i >= 0 { |
|||
if cs.values[i].Size > 0 && cs.values[i].Size.IsValid() { |
|||
ret = cs.values[i].Size |
|||
cs.values[i].Size = -cs.values[i].Size |
|||
} |
|||
} |
|||
if v, found := cs.findOverflowEntry(skey); found { |
|||
cs.deleteOverflowEntry(skey) |
|||
ret = v.Size |
|||
} |
|||
return ret |
|||
} |
|||
func (cs *CompactSection) Get(key NeedleId) (*new_map.NeedleValue, bool) { |
|||
cs.RLock() |
|||
defer cs.RUnlock() |
|||
if key > cs.end { |
|||
return nil, false |
|||
} |
|||
skey := SectionalNeedleId(key - cs.start) |
|||
if v, ok := cs.findOverflowEntry(skey); ok { |
|||
nv := toNeedleValue(v, cs) |
|||
return &nv, true |
|||
} |
|||
if i := cs.binarySearchValues(skey); i >= 0 { |
|||
nv := toNeedleValue(cs.values[i], cs) |
|||
return &nv, true |
|||
} |
|||
return nil, false |
|||
} |
|||
func (cs *CompactSection) binarySearchValues(key SectionalNeedleId) int { |
|||
x := sort.Search(len(cs.values), func(i int) bool { |
|||
return cs.values[i].Key >= key |
|||
}) |
|||
if x >= len(cs.values) { |
|||
return -1 |
|||
} |
|||
if cs.values[x].Key > key { |
|||
return -2 |
|||
} |
|||
return x |
|||
} |
|||
|
|||
// This map assumes mostly inserting increasing keys
|
|||
// This map assumes mostly inserting increasing keys
|
|||
type CompactMap struct { |
|||
list []*CompactSection |
|||
} |
|||
|
|||
func NewCompactMap() *CompactMap { |
|||
return &CompactMap{} |
|||
} |
|||
|
|||
func (cm *CompactMap) Set(key NeedleId, offset Offset, size Size) (oldOffset Offset, oldSize Size) { |
|||
x := cm.binarySearchCompactSection(key) |
|||
if x < 0 || (key-cm.list[x].start) > SectionalNeedleIdLimit { |
|||
// println(x, "adding to existing", len(cm.list), "sections, starting", key)
|
|||
cs := NewCompactSection(key) |
|||
cm.list = append(cm.list, cs) |
|||
x = len(cm.list) - 1 |
|||
//keep compact section sorted by start
|
|||
for x >= 0 { |
|||
if x > 0 && cm.list[x-1].start > key { |
|||
cm.list[x] = cm.list[x-1] |
|||
// println("shift", x, "start", cs.start, "to", x-1)
|
|||
x = x - 1 |
|||
} else { |
|||
cm.list[x] = cs |
|||
// println("cs", x, "start", cs.start)
|
|||
break |
|||
} |
|||
} |
|||
} |
|||
// println(key, "set to section[", x, "].start", cm.list[x].start)
|
|||
return cm.list[x].Set(key, offset, size) |
|||
} |
|||
func (cm *CompactMap) Delete(key NeedleId) Size { |
|||
x := cm.binarySearchCompactSection(key) |
|||
if x < 0 { |
|||
return Size(0) |
|||
} |
|||
return cm.list[x].Delete(key) |
|||
} |
|||
func (cm *CompactMap) Get(key NeedleId) (*new_map.NeedleValue, bool) { |
|||
x := cm.binarySearchCompactSection(key) |
|||
if x < 0 { |
|||
return nil, false |
|||
} |
|||
return cm.list[x].Get(key) |
|||
} |
|||
func (cm *CompactMap) binarySearchCompactSection(key NeedleId) int { |
|||
l, h := 0, len(cm.list)-1 |
|||
if h < 0 { |
|||
return -5 |
|||
} |
|||
if cm.list[h].start <= key { |
|||
if len(cm.list[h].values) < MaxSectionBucketSize || key <= cm.list[h].end { |
|||
return h |
|||
} |
|||
return -4 |
|||
} |
|||
for l <= h { |
|||
m := (l + h) / 2 |
|||
if key < cm.list[m].start { |
|||
h = m - 1 |
|||
} else { // cm.list[m].start <= key
|
|||
if cm.list[m+1].start <= key { |
|||
l = m + 1 |
|||
} else { |
|||
return m |
|||
} |
|||
} |
|||
} |
|||
return -3 |
|||
} |
|||
|
|||
// Visit visits all entries or stop if any error when visiting
|
|||
func (cm *CompactMap) AscendingVisit(visit func(new_map.NeedleValue) error) error { |
|||
for _, cs := range cm.list { |
|||
cs.RLock() |
|||
var i, j int |
|||
for i, j = 0, 0; i < len(cs.overflow) && j < len(cs.values); { |
|||
if cs.overflow[i].Key < cs.values[j].Key { |
|||
if err := visit(toNeedleValue(cs.overflow[i], cs)); err != nil { |
|||
cs.RUnlock() |
|||
return err |
|||
} |
|||
i++ |
|||
} else if cs.overflow[i].Key == cs.values[j].Key { |
|||
j++ |
|||
} else { |
|||
if err := visit(toNeedleValue(cs.values[j], cs)); err != nil { |
|||
cs.RUnlock() |
|||
return err |
|||
} |
|||
j++ |
|||
} |
|||
} |
|||
for ; i < len(cs.overflow); i++ { |
|||
if err := visit(toNeedleValue(cs.overflow[i], cs)); err != nil { |
|||
cs.RUnlock() |
|||
return err |
|||
} |
|||
} |
|||
for ; j < len(cs.values); j++ { |
|||
if err := visit(toNeedleValue(cs.values[j], cs)); err != nil { |
|||
cs.RUnlock() |
|||
return err |
|||
} |
|||
} |
|||
cs.RUnlock() |
|||
} |
|||
return nil |
|||
} |
|||
|
|||
func toNeedleValue(snv SectionalNeedleValue, cs *CompactSection) new_map.NeedleValue { |
|||
offset := Offset{ |
|||
OffsetHigher: snv.OffsetHigher, |
|||
OffsetLower: snv.OffsetLower, |
|||
} |
|||
return new_map.NeedleValue{Key: NeedleId(snv.Key) + cs.start, Offset: offset, Size: snv.Size} |
|||
} |
|||
|
|||
func toSectionalNeedleValue(nv new_map.NeedleValue, cs *CompactSection) SectionalNeedleValue { |
|||
return SectionalNeedleValue{ |
|||
Key: SectionalNeedleId(nv.Key - cs.start), |
|||
OffsetLower: nv.Offset.OffsetLower, |
|||
Size: nv.Size, |
|||
OffsetHigher: nv.Offset.OffsetHigher, |
|||
} |
|||
} |
|||
@ -0,0 +1,92 @@ |
|||
package needle_map |
|||
|
|||
import ( |
|||
"fmt" |
|||
"log" |
|||
"os" |
|||
"runtime" |
|||
"testing" |
|||
"time" |
|||
|
|||
. "github.com/seaweedfs/seaweedfs/weed/storage/types" |
|||
) |
|||
|
|||
/* |
|||
|
|||
To see the memory usage: |
|||
|
|||
go test -run TestMemoryUsage |
|||
The Alloc section shows the in-use memory increase for each iteration. |
|||
|
|||
go test -run TestMemoryUsage -memprofile=mem.out |
|||
go tool pprof --alloc_space needle.test mem.out |
|||
|
|||
|
|||
*/ |
|||
|
|||
func TestMemoryUsage(t *testing.T) { |
|||
|
|||
var maps []*CompactMap |
|||
totalRowCount := uint64(0) |
|||
|
|||
startTime := time.Now() |
|||
for i := 0; i < 10; i++ { |
|||
indexFile, ie := os.OpenFile("../../../../test/data/sample.idx", os.O_RDWR|os.O_RDONLY, 0644) |
|||
if ie != nil { |
|||
log.Fatalln(ie) |
|||
} |
|||
m, rowCount := loadNewNeedleMap(indexFile) |
|||
maps = append(maps, m) |
|||
totalRowCount += rowCount |
|||
|
|||
indexFile.Close() |
|||
|
|||
PrintMemUsage(totalRowCount) |
|||
now := time.Now() |
|||
fmt.Printf("\tTaken = %v\n", now.Sub(startTime)) |
|||
startTime = now |
|||
} |
|||
|
|||
} |
|||
|
|||
func loadNewNeedleMap(file *os.File) (*CompactMap, uint64) { |
|||
m := NewCompactMap() |
|||
bytes := make([]byte, NeedleMapEntrySize) |
|||
rowCount := uint64(0) |
|||
count, e := file.Read(bytes) |
|||
for count > 0 && e == nil { |
|||
for i := 0; i < count; i += NeedleMapEntrySize { |
|||
rowCount++ |
|||
key := BytesToNeedleId(bytes[i : i+NeedleIdSize]) |
|||
offset := BytesToOffset(bytes[i+NeedleIdSize : i+NeedleIdSize+OffsetSize]) |
|||
size := BytesToSize(bytes[i+NeedleIdSize+OffsetSize : i+NeedleIdSize+OffsetSize+SizeSize]) |
|||
|
|||
if !offset.IsZero() { |
|||
m.Set(NeedleId(key), offset, size) |
|||
} else { |
|||
m.Delete(key) |
|||
} |
|||
} |
|||
|
|||
count, e = file.Read(bytes) |
|||
} |
|||
|
|||
return m, rowCount |
|||
|
|||
} |
|||
|
|||
func PrintMemUsage(totalRowCount uint64) { |
|||
|
|||
runtime.GC() |
|||
var m runtime.MemStats |
|||
runtime.ReadMemStats(&m) |
|||
// For info on each, see: https://golang.org/pkg/runtime/#MemStats
|
|||
fmt.Printf("Each %.02f Bytes", float64(m.Alloc)/float64(totalRowCount)) |
|||
fmt.Printf("\tAlloc = %v MiB", bToMb(m.Alloc)) |
|||
fmt.Printf("\tTotalAlloc = %v MiB", bToMb(m.TotalAlloc)) |
|||
fmt.Printf("\tSys = %v MiB", bToMb(m.Sys)) |
|||
fmt.Printf("\tNumGC = %v", m.NumGC) |
|||
} |
|||
func bToMb(b uint64) uint64 { |
|||
return b / 1024 / 1024 |
|||
} |
|||
@ -0,0 +1,243 @@ |
|||
package needle_map |
|||
|
|||
import ( |
|||
"fmt" |
|||
"log" |
|||
"os" |
|||
"testing" |
|||
|
|||
"github.com/seaweedfs/seaweedfs/weed/sequence" |
|||
. "github.com/seaweedfs/seaweedfs/weed/storage/types" |
|||
|
|||
new_map "github.com/seaweedfs/seaweedfs/weed/storage/needle_map" |
|||
) |
|||
|
|||
func TestSnowflakeSequencer(t *testing.T) { |
|||
m := NewCompactMap() |
|||
seq, _ := sequence.NewSnowflakeSequencer("for_test", 1) |
|||
|
|||
for i := 0; i < 200000; i++ { |
|||
id := seq.NextFileId(1) |
|||
oldOffset, oldSize := m.Set(NeedleId(id), ToOffset(8), 3000073) |
|||
if oldSize != 0 { |
|||
t.Errorf("id %d oldOffset %v oldSize %d", id, oldOffset, oldSize) |
|||
} |
|||
} |
|||
|
|||
} |
|||
|
|||
func TestOverflow2(t *testing.T) { |
|||
m := NewCompactMap() |
|||
_, oldSize := m.Set(NeedleId(150088), ToOffset(8), 3000073) |
|||
if oldSize != 0 { |
|||
t.Fatalf("expecting no previous data") |
|||
} |
|||
_, oldSize = m.Set(NeedleId(150088), ToOffset(8), 3000073) |
|||
if oldSize != 3000073 { |
|||
t.Fatalf("expecting previous data size is %d, not %d", 3000073, oldSize) |
|||
} |
|||
m.Set(NeedleId(150073), ToOffset(8), 3000073) |
|||
m.Set(NeedleId(150089), ToOffset(8), 3000073) |
|||
m.Set(NeedleId(150076), ToOffset(8), 3000073) |
|||
m.Set(NeedleId(150124), ToOffset(8), 3000073) |
|||
m.Set(NeedleId(150137), ToOffset(8), 3000073) |
|||
m.Set(NeedleId(150147), ToOffset(8), 3000073) |
|||
m.Set(NeedleId(150145), ToOffset(8), 3000073) |
|||
m.Set(NeedleId(150158), ToOffset(8), 3000073) |
|||
m.Set(NeedleId(150162), ToOffset(8), 3000073) |
|||
|
|||
m.AscendingVisit(func(value new_map.NeedleValue) error { |
|||
println("needle key:", value.Key) |
|||
return nil |
|||
}) |
|||
} |
|||
|
|||
func TestIssue52(t *testing.T) { |
|||
m := NewCompactMap() |
|||
m.Set(NeedleId(10002), ToOffset(10002), 10002) |
|||
if element, ok := m.Get(NeedleId(10002)); ok { |
|||
fmt.Printf("key %d ok %v %d, %v, %d\n", 10002, ok, element.Key, element.Offset, element.Size) |
|||
} |
|||
m.Set(NeedleId(10001), ToOffset(10001), 10001) |
|||
if element, ok := m.Get(NeedleId(10002)); ok { |
|||
fmt.Printf("key %d ok %v %d, %v, %d\n", 10002, ok, element.Key, element.Offset, element.Size) |
|||
} else { |
|||
t.Fatal("key 10002 missing after setting 10001") |
|||
} |
|||
} |
|||
|
|||
func TestCompactMap(t *testing.T) { |
|||
m := NewCompactMap() |
|||
for i := uint32(0); i < 100*MaxSectionBucketSize; i += 2 { |
|||
m.Set(NeedleId(i), ToOffset(int64(i)), Size(i)) |
|||
} |
|||
|
|||
for i := uint32(0); i < 100*MaxSectionBucketSize; i += 37 { |
|||
m.Delete(NeedleId(i)) |
|||
} |
|||
|
|||
for i := uint32(0); i < 10*MaxSectionBucketSize; i += 3 { |
|||
m.Set(NeedleId(i), ToOffset(int64(i+11)), Size(i+5)) |
|||
} |
|||
|
|||
// for i := uint32(0); i < 100; i++ {
|
|||
// if v := m.Get(Key(i)); v != nil {
|
|||
// glog.V(4).Infoln(i, "=", v.Key, v.Offset, v.Size)
|
|||
// }
|
|||
// }
|
|||
|
|||
for i := uint32(0); i < 10*MaxSectionBucketSize; i++ { |
|||
v, ok := m.Get(NeedleId(i)) |
|||
if i%3 == 0 { |
|||
if !ok { |
|||
t.Fatal("key", i, "missing!") |
|||
} |
|||
if v.Size != Size(i+5) { |
|||
t.Fatal("key", i, "size", v.Size) |
|||
} |
|||
} else if i%37 == 0 { |
|||
if ok && v.Size.IsValid() { |
|||
t.Fatal("key", i, "should have been deleted needle value", v) |
|||
} |
|||
} else if i%2 == 0 { |
|||
if v.Size != Size(i) { |
|||
t.Fatal("key", i, "size", v.Size) |
|||
} |
|||
} |
|||
} |
|||
|
|||
for i := uint32(10 * MaxSectionBucketSize); i < 100*MaxSectionBucketSize; i++ { |
|||
v, ok := m.Get(NeedleId(i)) |
|||
if i%37 == 0 { |
|||
if ok && v.Size.IsValid() { |
|||
t.Fatal("key", i, "should have been deleted needle value", v) |
|||
} |
|||
} else if i%2 == 0 { |
|||
if v == nil { |
|||
t.Fatal("key", i, "missing") |
|||
} |
|||
if v.Size != Size(i) { |
|||
t.Fatal("key", i, "size", v.Size) |
|||
} |
|||
} |
|||
} |
|||
|
|||
} |
|||
|
|||
func TestOverflow(t *testing.T) { |
|||
cs := NewCompactSection(1) |
|||
|
|||
cs.setOverflowEntry(1, ToOffset(12), 12) |
|||
cs.setOverflowEntry(2, ToOffset(12), 12) |
|||
cs.setOverflowEntry(3, ToOffset(12), 12) |
|||
cs.setOverflowEntry(4, ToOffset(12), 12) |
|||
cs.setOverflowEntry(5, ToOffset(12), 12) |
|||
|
|||
if cs.overflow[2].Key != 3 { |
|||
t.Fatalf("expecting o[2] has key 3: %+v", cs.overflow[2].Key) |
|||
} |
|||
|
|||
cs.setOverflowEntry(3, ToOffset(24), 24) |
|||
|
|||
if cs.overflow[2].Key != 3 { |
|||
t.Fatalf("expecting o[2] has key 3: %+v", cs.overflow[2].Key) |
|||
} |
|||
|
|||
if cs.overflow[2].Size != 24 { |
|||
t.Fatalf("expecting o[2] has size 24: %+v", cs.overflow[2].Size) |
|||
} |
|||
|
|||
cs.deleteOverflowEntry(4) |
|||
|
|||
if len(cs.overflow) != 5 { |
|||
t.Fatalf("expecting 5 entries now: %+v", cs.overflow) |
|||
} |
|||
|
|||
x, _ := cs.findOverflowEntry(5) |
|||
if x.Key != 5 { |
|||
t.Fatalf("expecting entry 5 now: %+v", x) |
|||
} |
|||
|
|||
for i, x := range cs.overflow { |
|||
println("overflow[", i, "]:", x.Key) |
|||
} |
|||
println() |
|||
|
|||
cs.deleteOverflowEntry(1) |
|||
|
|||
for i, x := range cs.overflow { |
|||
println("overflow[", i, "]:", x.Key, "size", x.Size) |
|||
} |
|||
println() |
|||
|
|||
cs.setOverflowEntry(4, ToOffset(44), 44) |
|||
for i, x := range cs.overflow { |
|||
println("overflow[", i, "]:", x.Key) |
|||
} |
|||
println() |
|||
|
|||
cs.setOverflowEntry(1, ToOffset(11), 11) |
|||
|
|||
for i, x := range cs.overflow { |
|||
println("overflow[", i, "]:", x.Key) |
|||
} |
|||
println() |
|||
|
|||
} |
|||
|
|||
func TestCompactSection_Get(t *testing.T) { |
|||
var maps []*CompactMap |
|||
totalRowCount := uint64(0) |
|||
indexFile, ie := os.OpenFile("../../../../test/data/sample.idx", |
|||
os.O_RDWR|os.O_RDONLY, 0644) |
|||
defer indexFile.Close() |
|||
if ie != nil { |
|||
log.Fatalln(ie) |
|||
} |
|||
|
|||
m, rowCount := loadNewNeedleMap(indexFile) |
|||
maps = append(maps, m) |
|||
totalRowCount += rowCount |
|||
m.Set(1574318345753513987, ToOffset(10002), 10002) |
|||
nv, ok := m.Get(1574318345753513987) |
|||
if ok { |
|||
t.Log(uint64(nv.Key)) |
|||
} |
|||
|
|||
nv1, ok := m.Get(1574318350048481283) |
|||
if ok { |
|||
t.Error(uint64(nv1.Key)) |
|||
} |
|||
|
|||
m.Set(1574318350048481283, ToOffset(10002), 10002) |
|||
nv2, ok1 := m.Get(1574318350048481283) |
|||
if ok1 { |
|||
t.Log(uint64(nv2.Key)) |
|||
} |
|||
|
|||
m.Delete(nv2.Key) |
|||
nv3, has := m.Get(nv2.Key) |
|||
if has && nv3.Size > 0 { |
|||
t.Error(uint64(nv3.Size)) |
|||
} |
|||
} |
|||
|
|||
// Test after putting 1 ~ LookBackWindowSize*3 items in sequential order, but missing item LookBackWindowSize
|
|||
// insert the item LookBackWindowSize in the middle of the sequence
|
|||
func TestCompactSection_PutOutOfOrderItemBeyondLookBackWindow(t *testing.T) { |
|||
m := NewCompactMap() |
|||
|
|||
// put 1 ~ 10
|
|||
for i := 1; i <= LookBackWindowSize*3; i++ { |
|||
if i != LookBackWindowSize { |
|||
m.Set(NeedleId(i), ToOffset(int64(i)), Size(i)) |
|||
} |
|||
} |
|||
|
|||
m.Set(NeedleId(LookBackWindowSize), ToOffset(int64(LookBackWindowSize)), Size(LookBackWindowSize)) |
|||
|
|||
// check if 8 is in the right place
|
|||
if v, ok := m.Get(NeedleId(LookBackWindowSize)); !ok || v.Offset != ToOffset(LookBackWindowSize) || v.Size != Size(LookBackWindowSize) { |
|||
t.Fatalf("expected to find LookBackWindowSize at offset %d with size %d, but got %v", LookBackWindowSize, LookBackWindowSize, v) |
|||
} |
|||
} |
|||
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