seaweedfs

Commit Graph

Author	SHA1	Message	Date
chrislu	0d3947afab	retry parameters	2 weeks ago
chrislu	ba2dcfc26c	refactor: make circuit breaker parameters configurable in FilerClient The circuit breaker failure threshold (3) and reset timeout (30s) were hardcoded, making it difficult to tune the client's behavior in different deployment environments without modifying the code. Problem: func shouldSkipUnhealthyFiler(index int32) bool { if failureCount < 3 { // Hardcoded threshold return false } if time.Since(lastFailureTime) > 30time.Second { // Hardcoded timeout return false } } Different environments have different needs: - High-traffic production: may want lower threshold (2) for faster failover - Development/testing: may want higher threshold (5) to tolerate flaky networks - Low-latency services: may want shorter reset timeout (10s) - Batch processing: may want longer reset timeout (60s) Solution: 1. Added fields to FilerClientOption: - FailureThreshold int32 (default: 3) - ResetTimeout time.Duration (default: 30s) 2. Added fields to FilerClient: - failureThreshold int32 - resetTimeout time.Duration 3. Applied defaults in NewFilerClient with option override: failureThreshold := int32(3) resetTimeout := 30 time.Second if opt.FailureThreshold > 0 { failureThreshold = opt.FailureThreshold } if opt.ResetTimeout > 0 { resetTimeout = opt.ResetTimeout } 4. Updated shouldSkipUnhealthyFiler to use configurable values: if failureCount < fc.failureThreshold { ... } if time.Since(lastFailureTime) > fc.resetTimeout { ... } Benefits: ✓ Tunable for different deployment environments ✓ Backward compatible (defaults match previous hardcoded values) ✓ No breaking changes to existing code ✓ Better maintainability and flexibility Example usage: // Aggressive failover for low-latency production fc := wdclient.NewFilerClient(filers, dialOpt, dc, &wdclient.FilerClientOption{ FailureThreshold: 2, ResetTimeout: 10 * time.Second, }) // Tolerant of flaky networks in development fc := wdclient.NewFilerClient(filers, dialOpt, dc, &wdclient.FilerClientOption{ FailureThreshold: 5, ResetTimeout: 60 * time.Second, })	2 weeks ago
chrislu	e5073e75bc	refactor: address code review feedback on comments and style Fixed several code quality issues identified during review: 1. Corrected backoff algorithm description in filer_client.go: - Changed "Exponential backoff" to "Multiplicative backoff with 1.5x factor" - The formula waitTime * 3/2 produces 1s, 1.5s, 2.25s, not exponential 2^n - More accurate terminology prevents confusion 2. Removed redundant nil check in vidmap_client.go: - After the for loop, node is guaranteed to be non-nil - Loop either returns early or assigns non-nil value to node - Simplified: if node != nil { node.cache.Store(nil) } → node.cache.Store(nil) 3. Added startup logging to IAM server for consistency: - Log when master client connection starts - Matches pattern in S3ApiServer (line 100 in s3api_server.go) - Improves operational visibility during startup - Added missing glog import 4. Fixed indentation in filer/reader_at.go: - Lines 76-91 had incorrect indentation (extra tab level) - Line 93 also misaligned - Now properly aligned with surrounding code 5. Updated deprecation comment to follow Go convention: - Changed "DEPRECATED:" to "Deprecated:" (standard Go format) - Tools like staticcheck and IDEs recognize the standard format - Enables automated deprecation warnings in tooling - Better developer experience All changes are cosmetic and do not affect functionality.	2 weeks ago
chrislu	5426dc4027	fix: use client ID instead of timeout for gRPC signature parameter The pb.WithGrpcFilerClient signature parameter is meant to be a client identifier for logging and tracking (added as 'sw-client-id' gRPC metadata in streaming mode), not a timeout value. Problem: timeoutMs := int32(fc.grpcTimeout.Milliseconds()) // 5000 (5 seconds) err := pb.WithGrpcFilerClient(false, timeoutMs, filerAddress, ...) - Passing timeout (5000ms) as signature/client ID - Misuse of API: signature should be a unique client identifier - Timeout is already handled by timeoutCtx passed to gRPC call - Inconsistent with other callers (all use 0 or proper client ID) How WithGrpcFilerClient uses signature parameter: func WithGrpcClient(..., signature int32, ...) { if streamingMode && signature != 0 { md := metadata.New(map[string]string{"sw-client-id": fmt.Sprintf("%d", signature)}) ctx = metadata.NewOutgoingContext(ctx, md) } ... } It's for client identification, not timeout control! Fix: 1. Added clientId int32 field to FilerClient struct 2. Initialize with rand.Int31() in NewFilerClient for unique ID 3. Removed timeoutMs variable (and misleading comment) 4. Use fc.clientId in pb.WithGrpcFilerClient call Before: err := pb.WithGrpcFilerClient(false, timeoutMs, ...) ^^^^^^^^^ Wrong! (5000) After: err := pb.WithGrpcFilerClient(false, fc.clientId, ...) ^^^^^^^^^^^^ Correct! (random int31) Benefits: - Correct API usage (signature = client ID, not timeout) - Timeout still works via timeoutCtx (unchanged) - Consistent with other pb.WithGrpcFilerClient callers - Enables proper client tracking on filer side via gRPC metadata - Each FilerClient instance has unique ID for debugging Examples of correct usage elsewhere: weed/iamapi/iamapi_server.go:145 pb.WithGrpcFilerClient(false, 0, ...) weed/command/s3.go:215 pb.WithGrpcFilerClient(false, 0, ...) weed/shell/commands.go:110 pb.WithGrpcFilerClient(streamingMode, 0, ...) All use 0 (or a proper signature), not a timeout value.	2 weeks ago
chrislu	f0c27ffbb2	fix: create fresh timeout context for each filer retry attempt The timeout context was created once at function start and reused across all retry attempts, causing subsequent retries to run with progressively shorter (or expired) deadlines. Problem flow: Line 244: timeoutCtx, cancel := context.WithTimeout(ctx, 5s) defer cancel() Retry 1, filer 0: client.LookupVolume(timeoutCtx, ...) ← 5s available ✅ Retry 1, filer 1: client.LookupVolume(timeoutCtx, ...) ← 3s left Retry 1, filer 2: client.LookupVolume(timeoutCtx, ...) ← 0.5s left Retry 2, filer 0: client.LookupVolume(timeoutCtx, ...) ← EXPIRED! ❌ Result: Retries always fail with DeadlineExceeded, defeating the purpose of retries. Fix: Moved context.WithTimeout inside the per-filer loop, creating a fresh timeout context for each attempt: for x := 0; x < n; x++ { timeoutCtx, cancel := context.WithTimeout(ctx, fc.grpcTimeout) err := pb.WithGrpcFilerClient(..., func(client) { resp, err := client.LookupVolume(timeoutCtx, ...) ... }) cancel() // Clean up immediately after call } Benefits: - Each filer attempt gets full fc.grpcTimeout (default 5s) - Retries actually have time to complete - No context leaks (cancel called after each attempt) - More predictable timeout behavior Example with fix: Retry 1, filer 0: fresh 5s timeout ✅ Retry 1, filer 1: fresh 5s timeout ✅ Retry 2, filer 0: fresh 5s timeout ✅ Total max time: 3 retries × 3 filers × 5s = 45s (plus backoff) Note: The outer ctx (from caller) still provides overall cancellation if the caller cancels or times out the entire operation.	2 weeks ago
chrislu	19962b8c56	fix: data race on filerHealth.lastFailureTime in circuit breaker The circuit breaker tracked lastFailureTime as time.Time, which was written in recordFilerFailure and read in shouldSkipUnhealthyFiler without synchronization, causing a data race. Data race scenario: Goroutine 1: recordFilerFailure(0) health.lastFailureTime = time.Now() // ❌ unsynchronized write Goroutine 2: shouldSkipUnhealthyFiler(0) time.Since(health.lastFailureTime) // ❌ unsynchronized read → RACE DETECTED by -race detector Fix: Changed lastFailureTime from time.Time to int64 (lastFailureTimeNs) storing Unix nanoseconds for atomic access: Write side (recordFilerFailure): atomic.StoreInt64(&health.lastFailureTimeNs, time.Now().UnixNano()) Read side (shouldSkipUnhealthyFiler): lastFailureNs := atomic.LoadInt64(&health.lastFailureTimeNs) if lastFailureNs == 0 { return false } // Never failed lastFailureTime := time.Unix(0, lastFailureNs) time.Since(lastFailureTime) > 30*time.Second Benefits: - Atomic reads/writes (no data race) - Efficient (int64 is 8 bytes, always atomic on 64-bit systems) - Zero value (0) naturally means "never failed" - No mutex needed (lock-free circuit breaker) Note: sync/atomic was already imported for failureCount, so no new import needed.	2 weeks ago
chrislu	b0058af417	fix: IAM server must start KeepConnectedToMaster for masterClient usage The IAM server creates and uses a MasterClient but never started KeepConnectedToMaster, which could cause blocking if IAM config files have chunks requiring volume lookups. Problem flow: NewIamApiServerWithStore() → creates masterClient → ❌ NEVER starts KeepConnectedToMaster GetS3ApiConfigurationFromFiler() → filer.ReadEntry(iama.masterClient, ...) → StreamContent(masterClient, ...) if file has chunks → masterClient.GetLookupFileIdFunction() → GetMaster(ctx) ← BLOCKS indefinitely waiting for connection! While IAM config files (identity & policies) are typically small and stored inline without chunks, the code path exists and would block if the files ever had chunks. Fix: Start KeepConnectedToMaster in background goroutine right after creating masterClient, following the documented pattern: mc := wdclient.NewMasterClient(...) go mc.KeepConnectedToMaster(ctx) This ensures masterClient is usable if ReadEntry ever needs to stream chunked content from volume servers. Note: This bug was dormant because IAM config files are small (<256 bytes) and SeaweedFS stores small files inline in Entry.Content, not as chunks. The bug would only manifest if: - IAM config grew > 256 bytes (inline threshold) - Config was stored as chunks on volume servers - ReadEntry called StreamContent - GetMaster blocked indefinitely Now all 9 production MasterClient instances correctly follow the pattern.	2 weeks ago
chrislu	8ef04a4a84	improve: clarify Aborted error handling in volume lookups Added documentation and logging to address the concern that codes.Aborted might not always be retryable in all contexts. Context-specific justification for treating Aborted as retryable: Volume location lookups (LookupVolume RPC) are simple, read-only operations: - No transactions - No write conflicts - No application-level state changes - Idempotent (safe to retry) In this context, Aborted is most likely caused by: - Filer restarting/recovering (transient) - Connection interrupted mid-request (transient) - Server-side resource cleanup (transient) NOT caused by: - Application-level conflicts (no writes) - Transaction failures (no transactions) - Logical errors (read-only lookup) Changes: 1. Added detailed comment explaining the context-specific reasoning 2. Added V(1) logging when treating Aborted as retryable - Helps detect misclassification if it occurs - Visible in verbose logs for troubleshooting 3. Split switch statement for clarity (one case per line) If future analysis shows Aborted should not be retried, operators will now have visibility via logs to make that determination. The logging provides evidence for future tuning decisions. Alternative approaches considered but not implemented: - Removing Aborted entirely (too conservative for read-only ops) - Message content inspection (adds complexity, no known patterns yet) - Different handling per RPC type (premature optimization)	2 weeks ago
chrislu	99ae38339d	fix: OnPeerUpdate should only process updates for matching FilerGroup Critical bug: The OnPeerUpdate callback was incorrectly moved outside the FilerGroup check when restoring observability instrumentation. This caused clients to process peer updates for ALL filer groups, not just their own. Problem: Before: mc.OnPeerUpdate only called for update.FilerGroup == mc.FilerGroup Bug: mc.OnPeerUpdate called for ALL updates regardless of FilerGroup Impact: - Multi-tenant deployments with separate filer groups would see cross-group updates (e.g., group A clients processing group B updates) - Could cause incorrect cluster membership tracking - OnPeerUpdate handlers (like Filer's DLM ring updates) would receive irrelevant updates from other groups Example scenario: Cluster has two filer groups: "production" and "staging" Production filer connects with FilerGroup="production" Incorrect behavior (bug): - Receives "staging" group updates - Incorrectly adds staging filers to production DLM ring - Cross-tenant data access issues Correct behavior (fixed): - Only receives "production" group updates - Only adds production filers to production DLM ring - Proper isolation between groups Fix: Moved mc.OnPeerUpdate(update, time.Now()) back INSIDE the FilerGroup check where it belongs, matching the original implementation. The logging and stats counter were already correctly scoped to matching FilerGroup, so they remain inside the if block as intended.	2 weeks ago
chrislu	3a5b5ea02c	improve: add circuit breaker to skip known-unhealthy filers The previous implementation tried all filers on every failure, including known-unhealthy ones. This wasted time retrying permanently down filers. Problem scenario (3 filers, filer0 is down): - Last successful: filer1 (saved as filerIndex=1) - Next lookup when filer1 fails: Retry 1: filer1(fail) → filer2(fail) → filer0(fail, wastes 5s timeout) Retry 2: filer1(fail) → filer2(fail) → filer0(fail, wastes 5s timeout) Retry 3: filer1(fail) → filer2(fail) → filer0(fail, wastes 5s timeout) Total wasted: 15 seconds on known-bad filer! Solution: Circuit breaker pattern - Track consecutive failures per filer (atomic int32) - Skip filers with 3+ consecutive failures - Re-check unhealthy filers every 30 seconds - Reset failure count on success New behavior: - filer0 fails 3 times → marked unhealthy - Future lookups skip filer0 for 30 seconds - After 30s, re-check filer0 (allows recovery) - If filer0 succeeds, reset failure count to 0 Benefits: 1. Avoids wasting time on known-down filers 2. Still sticks to last healthy filer (via filerIndex) 3. Allows recovery (30s re-check window) 4. No configuration needed (automatic) Implementation details: - filerHealth struct tracks failureCount (atomic) + lastFailureTime - shouldSkipUnhealthyFiler(): checks if we should skip this filer - recordFilerSuccess(): resets failure count to 0 - recordFilerFailure(): increments count, updates timestamp - Logs when skipping unhealthy filers (V(2) level) Example with circuit breaker: - filer0 down, saved filerIndex=1 (filer1 healthy) - Lookup 1: filer1(ok) → Done (0.01s) - Lookup 2: filer1(fail) → filer2(ok) → Done, save filerIndex=2 (0.01s) - Lookup 3: filer2(fail) → skip filer0 (unhealthy) → filer1(ok) → Done (0.01s) Much better than wasting 15s trying filer0 repeatedly!	2 weeks ago
chrislu	9d31b5d21d	fmt	2 weeks ago
chrislu	85ad2e9a13	improve: implement gRPC-aware retry for FilerClient volume lookups The previous implementation used util.Retry which only retries errors containing the string "transport". This is insufficient for handling the full range of transient gRPC errors. Changes: 1. Added isRetryableGrpcError() to properly inspect gRPC status codes - Retries: Unavailable, DeadlineExceeded, ResourceExhausted, Aborted - Falls back to string matching for non-gRPC network errors 2. Replaced util.Retry with custom retry loop - 3 attempts with exponential backoff (1s, 1.5s, 2.25s) - Tries all N filers on each attempt (N*3 total attempts max) - Fast-fails on non-retryable errors (NotFound, PermissionDenied, etc.) 3. Improved logging - Shows both filer attempt (x/N) and retry attempt (y/3) - Logs retry reason and wait time for debugging Benefits: - Better handling of transient gRPC failures (server restarts, load spikes) - Faster failure for permanent errors (no wasted retries) - More informative logs for troubleshooting - Maintains existing HA failover across multiple filers Example: If all 3 filers return Unavailable (server overload): - Attempt 1: try all 3 filers, wait 1s - Attempt 2: try all 3 filers, wait 1.5s - Attempt 3: try all 3 filers, fail Example: If filer returns NotFound (volume doesn't exist): - Attempt 1: try all 3 filers, fast-fail (no retry)	2 weeks ago
chrislu	1601a4133a	improve: address remaining code review findings 1. Lazy initialize FilerClient in mount for proxy-only setups - Only create FilerClient when VolumeServerAccess != "filerProxy" - Avoids wasted work when all reads proxy through filer - filerClient is nil for proxy mode, initialized for direct access 2. Fix inaccurate deprecation comment in filer.LookupFn - Updated comment to reflect current behavior (10k bounded cache) - Removed claim of "unbounded growth" after adding size limit - Still directs new code to wdclient.FilerClient for better features 3. Audit all MasterClient usages for KeepConnectedToMaster - Verified all production callers start KeepConnectedToMaster early - Filer, Shell, Master, Broker, Benchmark, Admin all correct - IAM creates MasterClient but never uses it (harmless) - Test code doesn't need KeepConnectedToMaster (mocks) All callers properly follow the initialization pattern documented in GetMaster(), preventing unexpected blocking or timeouts.	2 weeks ago
chrislu	71f8a6e189	fix: handle partial results correctly in LookupVolumeIdsWithFallback callers Two callers were discarding partial results by checking err before processing the result map. While these are currently single-volume lookups (so partial results aren't possible), the code was fragile and would break if we ever batched multiple volumes together. Changes: - Check result map FIRST, then conditionally check error - If volume is found in result, use it (ignore errors about other volumes) - If volume is NOT found and err != nil, include error context with %w - Add defensive comments explaining the pattern for future maintainers This makes the code: 1. Correct for future batched lookups 2. More informative (preserves underlying error details) 3. Consistent with filer_grpc_server.go which already handles this correctly Example: If looking up ["1", "2", "999"] and only 999 fails, callers looking for volumes 1 or 2 will succeed instead of failing unnecessarily.	2 weeks ago
chrislu	01b9b68ac5	fix: FilerClient supports multiple filer addresses for high availability Critical fix: FilerClient now accepts []ServerAddress instead of single address - Prevents mount failure when first filer is down (regression fix) - Implements automatic failover to remaining filers - Uses round-robin with atomic index tracking (same pattern as WFS.WithFilerClient) - Retries all configured filers before giving up - Updates successful filer index for future requests Changes: - NewFilerClient([]pb.ServerAddress, ...) instead of (pb.ServerAddress, ...) - filerVolumeProvider references FilerClient for failover access - LookupVolumeIds tries all filers with util.Retry pattern - Mount passes all option.FilerAddresses for HA - S3 wraps single filer in slice for API consistency This restores the high availability that existed in the old implementation where mount would automatically failover between configured filers.	2 weeks ago
chrislu	5a1eed0835	refactor: mount uses FilerClient for efficient volume location caching - Add configurable vidMap cache size (default: 5 historical snapshots) - Add FilerClientOption struct for clean configuration * GrpcTimeout: default 5 seconds (prevents hanging requests) * UrlPreference: PreferUrl or PreferPublicUrl * CacheSize: number of historical vidMap snapshots (for volume moves) - NewFilerClient uses option struct for better API extensibility - Improved error handling in filerVolumeProvider.LookupVolumeIds: * Distinguish genuine 'not found' from communication failures * Log volumes missing from filer response * Return proper error context with volume count * Document that filer Locations lacks Error field (unlike master) - FilerClient.GetLookupFileIdFunction() handles URL preference automatically - Mount (WFS) creates FilerClient with appropriate options - Benefits for weed mount: * Singleflight: Deduplicates concurrent volume lookups * Cache history: Old volume locations available briefly when volumes move * Configurable cache depth: Tune for different deployment environments * Battle-tested vidMap cache with cache chain * Better concurrency handling with timeout protection * Improved error visibility and debugging - Old filer.LookupFn() kept for backward compatibility - Performance improvement for mount operations with high concurrency	2 weeks ago
chrislu	c0342f23b7	adds FilerClient to use cached volume id	2 weeks ago

17 Commits (85cbe7f7b252dad677eada13e961767f0d20cfac)