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package storage
import (
"fmt"
"os"
"path/filepath"
"sync"
"testing"
"github.com/seaweedfs/seaweedfs/weed/storage/types"
)
func TestLevelDbNeedleMap_Concurrency(t *testing.T) {
dir, err := os.MkdirTemp("", "test_leveldb_concurrency")
if err != nil {
t.Fatalf("temp dir: %v", err)
}
defer os.RemoveAll(dir)
prefix := "test"
indexFile, err := os.Create(filepath.Join(dir, prefix+".idx"))
if err != nil {
t.Fatalf("create index file: %v", err)
}
dbFileName := filepath.Join(dir, prefix+".ldb")
// Create and initialize map
m, err := NewLevelDbNeedleMap(dbFileName, indexFile, nil, 1)
if err != nil {
t.Fatalf("NewLevelDbNeedleMap: %v", err)
}
defer m.Close()
// Pre-populate some data
key := types.NeedleId(1)
if err := m.Put(key, types.ToOffset(100), types.Size(200)); err != nil {
t.Fatalf("Put: %v", err)
}
// Force unload to start from nil state
if err := unloadLdb(m); err != nil {
t.Fatalf("unloadLdb: %v", err)
}
var wg sync.WaitGroup
startCh := make(chan struct{})
errCh := make(chan error, 100)
// Spawn multiple goroutines to trigger the race
// Multiple readers will see m.db == nil and try to reload concurrently
for i := 0; i < 2; i++ {
wg.Add(1)
go func(id int) {
defer wg.Done()
<-startCh
// Try multiple times to increase chance of collision
for j := 0; j < 2; j++ {
_, ok := m.Get(key)
if !ok {
// Get failed, possibly due to race in reload.
// But we also put data concurrently, so maybe it's missing if deleted?
// In this test, we only Put, never Delete. So Key 1 should be there.
// However, if DB reload fails, Get returns false!
errCh <- fmt.Errorf("routine %d iter %d: Get returned false", id, j)
}
// Also try Put concurrently
err := m.Put(types.NeedleId(2+id), types.ToOffset(100), types.Size(200))
if err != nil {
errCh <- fmt.Errorf("routine %d iter %d: Put failed: %v", id, j, err)
}
// Manually unload occasionally to reset the state
if j%2 == 0 {
// This might fail if locked, but that's fine
unloadLdb(m)
}
}
}(i)
}
close(startCh)
wg.Wait()
close(errCh)
for e := range errCh {
t.Errorf("Error encountered: %v", e)
}
}