Cherry-pick commits for v2.0.3

.travis.yml

@@ -33,9 +33,7 @@ notifications:
   slack:
     secure: 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
 
-before_script:
-- go get github.com/mattn/goveralls
 script:
-- bash contrib/cover.sh $HOME/build coverage.out || travis_terminate 1
-- goveralls -service=travis-ci -coverprofile=coverage.out || true
-- goveralls -coverprofile=coverage.out -service=travis-ci
+- go test -v ./...
+# Another round of tests after turning off mmap
+- go test -v -vlog_mmap=false github.com/dgraph-io/badger

CHANGELOG.md

@@ -4,7 +4,32 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Serialization Versioning](VERSIONING.md).
 
-## [2.0.2] - 2020-02-26
+## [2.0.3] - 2020-03-24
+
+### Fixed
+
+- Add support for watching nil prefix in subscribe API (#1246)
+
+### Performance
+
+- Compress/Encrypt Blocks in the background (#1227)
+- Disable cache by default (#1257)
+
+### Features
+
+- Add BypassDirLock option (#1243)
+- Add separate cache for bloomfilters (#1260)
+
+### New APIs
+- badger.DB
+  - BfCacheMetrics (#1260)
+  - DataCacheMetrics (#1260)
+- badger.Options
+  - WithBypassLockGuard (#1243)
+  - WithLoadBloomsOnOpen (#1260)
+  - WithMaxBfCacheSize (#1260)
+
+## [2.0.2] - 2020-03-02
 
 ### Fixed
 
@@ -293,6 +318,8 @@ Bug fix:
 ## [1.0.1] - 2017-11-06
 * Fix an uint16 overflow when resizing key slice
 
+[Unreleased]: https://github.com/dgraph-io/badger/compare/v2.0.3...HEAD
+[2.0.3]: https://github.com/dgraph-io/badger/compare/v2.0.2...v2.0.3
 [2.0.2]: https://github.com/dgraph-io/badger/compare/v2.0.1...v2.0.2
 [2.0.1]: https://github.com/dgraph-io/badger/compare/v2.0.0...v2.0.1
 [2.0.0]: https://github.com/dgraph-io/badger/compare/v1.6.0...v2.0.0

README.md

@@ -776,6 +776,7 @@ Below is a list of known projects that use Badger:
 * [Volument](https://volument.com/) - A new take on website analytics backed by Badger.
 * [Sloop](https://github.com/salesforce/sloop) - Kubernetes History Visualization.
 * [KVdb](https://kvdb.io/) - Hosted key-value store and serverless platform built on top of Badger.
+* [Dkron](https://dkron.io/) - Distributed, fault tolerant job scheduling system.
 
 If you are using Badger in a project please send a pull request to add it to the list.
 

db.go

@@ -92,6 +92,7 @@ type DB struct {
 	pub        *publisher
 	registry   *KeyRegistry
 	blockCache *ristretto.Cache
+	bfCache    *ristretto.Cache
 }
 
 const (
@@ -234,33 +235,35 @@ func Open(opt Options) (db *DB, err error) {
 		if err := createDirs(opt); err != nil {
 			return nil, err
 		}
-		dirLockGuard, err = acquireDirectoryLock(opt.Dir, lockFile, opt.ReadOnly)
-		if err != nil {
-			return nil, err
-		}
-		defer func() {
-			if dirLockGuard != nil {
-				_ = dirLockGuard.release()
-			}
-		}()
-		absDir, err := filepath.Abs(opt.Dir)
-		if err != nil {
-			return nil, err
-		}
-		absValueDir, err := filepath.Abs(opt.ValueDir)
-		if err != nil {
-			return nil, err
-		}
-		if absValueDir != absDir {
-			valueDirLockGuard, err = acquireDirectoryLock(opt.ValueDir, lockFile, opt.ReadOnly)
+		if !opt.BypassLockGuard {
+			dirLockGuard, err = acquireDirectoryLock(opt.Dir, lockFile, opt.ReadOnly)
 			if err != nil {
 				return nil, err
 			}
 			defer func() {
-				if valueDirLockGuard != nil {
-					_ = valueDirLockGuard.release()
+				if dirLockGuard != nil {
+					_ = dirLockGuard.release()
 				}
 			}()
+			absDir, err := filepath.Abs(opt.Dir)
+			if err != nil {
+				return nil, err
+			}
+			absValueDir, err := filepath.Abs(opt.ValueDir)
+			if err != nil {
+				return nil, err
+			}
+			if absValueDir != absDir {
+				valueDirLockGuard, err = acquireDirectoryLock(opt.ValueDir, lockFile, opt.ReadOnly)
+				if err != nil {
+					return nil, err
+				}
+				defer func() {
+					if valueDirLockGuard != nil {
+						_ = valueDirLockGuard.release()
+					}
+				}()
+			}
 		}
 	}
 
@@ -302,13 +305,28 @@ func Open(opt Options) (db *DB, err error) {
 		}
 		db.blockCache, err = ristretto.NewCache(&config)
 		if err != nil {
-			return nil, errors.Wrap(err, "failed to create cache")
+			return nil, errors.Wrap(err, "failed to create data cache")
+		}
+	}
+
+	if opt.MaxBfCacheSize > 0 {
+		config := ristretto.Config{
+			// Use 5% of cache memory for storing counters.
+			NumCounters: int64(float64(opt.MaxBfCacheSize) * 0.05 * 2),
+			MaxCost:     int64(float64(opt.MaxBfCacheSize) * 0.95),
+			BufferItems: 64,
+			Metrics:     true,
+		}
+		db.blockCache, err = ristretto.NewCache(&config)
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to create bf cache")
 		}
 	}
 
 	if db.opt.InMemory {
 		db.opt.SyncWrites = false
-		db.opt.ValueThreshold = maxValueThreshold
+		// If badger is running in memory mode, push everything into the LSM Tree.
+		db.opt.ValueThreshold = math.MaxInt32
 	}
 	krOpt := KeyRegistryOptions{
 		ReadOnly:                      opt.ReadOnly,
@@ -331,6 +349,9 @@ func Open(opt Options) (db *DB, err error) {
 		return nil, err
 	}
 
+	// Initialize vlog struct.
+	db.vlog.init(db)
+
 	if !opt.ReadOnly {
 		db.closers.compactors = y.NewCloser(1)
 		db.lc.startCompact(db.closers.compactors)
@@ -387,14 +408,22 @@ func Open(opt Options) (db *DB, err error) {
 	return db, nil
 }
 
-// CacheMetrics returns the metrics for the underlying cache.
-func (db *DB) CacheMetrics() *ristretto.Metrics {
+// DataCacheMetrics returns the metrics for the underlying data cache.
+func (db *DB) DataCacheMetrics() *ristretto.Metrics {
 	if db.blockCache != nil {
 		return db.blockCache.Metrics
 	}
 	return nil
 }
 
+// BfCacheMetrics returns the metrics for the underlying bloom filter cache.
+func (db *DB) BfCacheMetrics() *ristretto.Metrics {
+	if db.bfCache != nil {
+		return db.bfCache.Metrics
+	}
+	return nil
+}
+
 // Close closes a DB. It's crucial to call it to ensure all the pending updates make their way to
 // disk. Calling DB.Close() multiple times would still only close the DB once.
 func (db *DB) Close() error {
@@ -484,6 +513,7 @@ func (db *DB) close() (err error) {
 	db.closers.updateSize.SignalAndWait()
 	db.orc.Stop()
 	db.blockCache.Close()
+	db.bfCache.Close()
 
 	db.elog.Finish()
 	if db.opt.InMemory {
@@ -951,6 +981,7 @@ func (db *DB) handleFlushTask(ft flushTask) error {
 	bopts.DataKey = dk
 	// Builder does not need cache but the same options are used for opening table.
 	bopts.Cache = db.blockCache
+	bopts.BfCache = db.bfCache
 	tableData := buildL0Table(ft, bopts)
 
 	fileID := db.lc.reserveFileID()
@@ -1509,6 +1540,7 @@ func (db *DB) dropAll() (func(), error) {
 	db.lc.nextFileID = 1
 	db.opt.Infof("Deleted %d value log files. DropAll done.\n", num)
 	db.blockCache.Clear()
+	db.bfCache.Clear()
 
 	return resume, nil
 }
@@ -1576,9 +1608,7 @@ func (db *DB) Subscribe(ctx context.Context, cb func(kv *KVList) error, prefixes
 	if cb == nil {
 		return ErrNilCallback
 	}
-	if len(prefixes) == 0 {
-		return ErrNoPrefixes
-	}
+
 	c := y.NewCloser(1)
 	recvCh, id := db.pub.newSubscriber(c, prefixes...)
 	slurp := func(batch *pb.KVList) error {
@@ -1612,7 +1642,7 @@ func (db *DB) Subscribe(ctx context.Context, cb func(kv *KVList) error, prefixes
 			err := slurp(batch)
 			if err != nil {
 				c.Done()
-				// Delete the subsriber if there is an error by the callback.
+				// Delete the subscriber if there is an error by the callback.
 				db.pub.deleteSubscriber(id)
 				return err
 			}

db2_test.go

@@ -669,16 +669,13 @@ func TestL0GCBug(t *testing.T) {
 	// Simulate a crash by not closing db1 but releasing the locks.
 	if db1.dirLockGuard != nil {
 		require.NoError(t, db1.dirLockGuard.release())
+		db1.dirLockGuard = nil
 	}
 	if db1.valueDirGuard != nil {
 		require.NoError(t, db1.valueDirGuard.release())
+		db1.valueDirGuard = nil
 	}
-	for _, f := range db1.vlog.filesMap {
-		require.NoError(t, f.fd.Close())
-	}
-	require.NoError(t, db1.registry.Close())
-	require.NoError(t, db1.lc.close())
-	require.NoError(t, db1.manifest.close())
+	require.NoError(t, db1.Close())
 
 	db2, err := Open(opts)
 	require.NoError(t, err)

errors.go

@@ -110,9 +110,6 @@ var (
 	// ErrNilCallback is returned when subscriber's callback is nil.
 	ErrNilCallback = errors.New("Callback cannot be nil")
 
-	// ErrNoPrefixes is returned when subscriber doesn't provide any prefix.
-	ErrNoPrefixes = errors.New("At least one key prefix is required")
-
 	// ErrEncryptionKeyMismatch is returned when the storage key is not
 	// matched with the key previously given.
 	ErrEncryptionKeyMismatch = errors.New("Encryption key mismatch")

levels.go

@@ -160,6 +160,7 @@ func newLevelsController(db *DB, mf *Manifest) (*levelsController, error) {
 			topt.Compression = tf.Compression
 			topt.DataKey = dk
 			topt.Cache = db.blockCache
+			topt.BfCache = db.bfCache
 			t, err := table.OpenTable(fd, topt)
 			if err != nil {
 				if strings.HasPrefix(err.Error(), "CHECKSUM_MISMATCH:") {
@@ -530,6 +531,7 @@ func (s *levelsController) compactBuildTables(
 		bopts.DataKey = dk
 		// Builder does not need cache but the same options are used for opening table.
 		bopts.Cache = s.kv.blockCache
+		bopts.BfCache = s.kv.bfCache
 		builder := table.NewTableBuilder(bopts)
 		var numKeys, numSkips uint64
 		for ; it.Valid(); it.Next() {