diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/batch.go b/vendor/github.com/syndtr/goleveldb/leveldb/batch.go
index 225920002d..823be93f93 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/batch.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/batch.go
@@ -238,6 +238,11 @@ func newBatch() interface{} {
 	return &Batch{}
 }
 
+// MakeBatch returns empty batch with preallocated buffer.
+func MakeBatch(n int) *Batch {
+	return &Batch{data: make([]byte, 0, n)}
+}
+
 func decodeBatch(data []byte, fn func(i int, index batchIndex) error) error {
 	var index batchIndex
 	for i, o := 0, 0; o < len(data); i++ {
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/db.go b/vendor/github.com/syndtr/goleveldb/leveldb/db.go
index 0de5ffe8d7..74e9826956 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/db.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/db.go
@@ -38,6 +38,12 @@ type DB struct {
 	inWritePaused          int32 // The indicator whether write operation is paused by compaction
 	aliveSnaps, aliveIters int32
 
+	// Compaction statistic
+	memComp       uint32 // The cumulative number of memory compaction
+	level0Comp    uint32 // The cumulative number of level0 compaction
+	nonLevel0Comp uint32 // The cumulative number of non-level0 compaction
+	seekComp      uint32 // The cumulative number of seek compaction
+
 	// Session.
 	s *session
 
@@ -978,6 +984,8 @@ func (db *DB) GetProperty(name string) (value string, err error) {
 		value += fmt.Sprintf(" Total | %10d | %13.5f | %13.5f | %13.5f | %13.5f\n",
 			totalTables, float64(totalSize)/1048576.0, totalDuration.Seconds(),
 			float64(totalRead)/1048576.0, float64(totalWrite)/1048576.0)
+	case p == "compcount":
+		value = fmt.Sprintf("MemComp:%d Level0Comp:%d NonLevel0Comp:%d SeekComp:%d", atomic.LoadUint32(&db.memComp), atomic.LoadUint32(&db.level0Comp), atomic.LoadUint32(&db.nonLevel0Comp), atomic.LoadUint32(&db.seekComp))
 	case p == "iostats":
 		value = fmt.Sprintf("Read(MB):%.5f Write(MB):%.5f",
 			float64(db.s.stor.reads())/1048576.0,
@@ -1034,6 +1042,11 @@ type DBStats struct {
 	LevelRead         Sizes
 	LevelWrite        Sizes
 	LevelDurations    []time.Duration
+
+	MemComp       uint32
+	Level0Comp    uint32
+	NonLevel0Comp uint32
+	SeekComp      uint32
 }
 
 // Stats populates s with database statistics.
@@ -1070,16 +1083,17 @@ func (db *DB) Stats(s *DBStats) error {
 
 	for level, tables := range v.levels {
 		duration, read, write := db.compStats.getStat(level)
-		if len(tables) == 0 && duration == 0 {
-			continue
-		}
+
 		s.LevelDurations = append(s.LevelDurations, duration)
 		s.LevelRead = append(s.LevelRead, read)
 		s.LevelWrite = append(s.LevelWrite, write)
 		s.LevelSizes = append(s.LevelSizes, tables.size())
 		s.LevelTablesCounts = append(s.LevelTablesCounts, len(tables))
 	}
-
+	s.MemComp = atomic.LoadUint32(&db.memComp)
+	s.Level0Comp = atomic.LoadUint32(&db.level0Comp)
+	s.NonLevel0Comp = atomic.LoadUint32(&db.nonLevel0Comp)
+	s.SeekComp = atomic.LoadUint32(&db.seekComp)
 	return nil
 }
 
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/db_compaction.go b/vendor/github.com/syndtr/goleveldb/leveldb/db_compaction.go
index 56f3632a7d..6b70eb2c9d 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/db_compaction.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/db_compaction.go
@@ -8,6 +8,7 @@ package leveldb
 
 import (
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/syndtr/goleveldb/leveldb/errors"
@@ -324,10 +325,12 @@ func (db *DB) memCompaction() {
 
 	db.logf("memdb@flush committed F·%d T·%v", len(rec.addedTables), stats.duration)
 
+	// Save compaction stats
 	for _, r := range rec.addedTables {
 		stats.write += r.size
 	}
 	db.compStats.addStat(flushLevel, stats)
+	atomic.AddUint32(&db.memComp, 1)
 
 	// Drop frozen memdb.
 	db.dropFrozenMem()
@@ -588,6 +591,14 @@ func (db *DB) tableCompaction(c *compaction, noTrivial bool) {
 	for i := range stats {
 		db.compStats.addStat(c.sourceLevel+1, &stats[i])
 	}
+	switch c.typ {
+	case level0Compaction:
+		atomic.AddUint32(&db.level0Comp, 1)
+	case nonLevel0Compaction:
+		atomic.AddUint32(&db.nonLevel0Comp, 1)
+	case seekCompaction:
+		atomic.AddUint32(&db.seekComp, 1)
+	}
 }
 
 func (db *DB) tableRangeCompaction(level int, umin, umax []byte) error {
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/db_iter.go b/vendor/github.com/syndtr/goleveldb/leveldb/db_iter.go
index 03c24cdab5..e6e8ca59d0 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/db_iter.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/db_iter.go
@@ -78,13 +78,17 @@ func (db *DB) newIterator(auxm *memDB, auxt tFiles, seq uint64, slice *util.Rang
 	}
 	rawIter := db.newRawIterator(auxm, auxt, islice, ro)
 	iter := &dbIter{
-		db:     db,
-		icmp:   db.s.icmp,
-		iter:   rawIter,
-		seq:    seq,
-		strict: opt.GetStrict(db.s.o.Options, ro, opt.StrictReader),
-		key:    make([]byte, 0),
-		value:  make([]byte, 0),
+		db:              db,
+		icmp:            db.s.icmp,
+		iter:            rawIter,
+		seq:             seq,
+		strict:          opt.GetStrict(db.s.o.Options, ro, opt.StrictReader),
+		disableSampling: db.s.o.GetDisableSeeksCompaction() || db.s.o.GetIteratorSamplingRate() <= 0,
+		key:             make([]byte, 0),
+		value:           make([]byte, 0),
+	}
+	if !iter.disableSampling {
+		iter.samplingGap = db.iterSamplingRate()
 	}
 	atomic.AddInt32(&db.aliveIters, 1)
 	runtime.SetFinalizer(iter, (*dbIter).Release)
@@ -107,13 +111,14 @@ const (
 
 // dbIter represent an interator states over a database session.
 type dbIter struct {
-	db     *DB
-	icmp   *iComparer
-	iter   iterator.Iterator
-	seq    uint64
-	strict bool
+	db              *DB
+	icmp            *iComparer
+	iter            iterator.Iterator
+	seq             uint64
+	strict          bool
+	disableSampling bool
 
-	smaplingGap int
+	samplingGap int
 	dir         dir
 	key         []byte
 	value       []byte
@@ -122,10 +127,14 @@ type dbIter struct {
 }
 
 func (i *dbIter) sampleSeek() {
+	if i.disableSampling {
+		return
+	}
+
 	ikey := i.iter.Key()
-	i.smaplingGap -= len(ikey) + len(i.iter.Value())
-	for i.smaplingGap < 0 {
-		i.smaplingGap += i.db.iterSamplingRate()
+	i.samplingGap -= len(ikey) + len(i.iter.Value())
+	for i.samplingGap < 0 {
+		i.samplingGap += i.db.iterSamplingRate()
 		i.db.sampleSeek(ikey)
 	}
 }
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/db_transaction.go b/vendor/github.com/syndtr/goleveldb/leveldb/db_transaction.go
index f145b64fbb..ff9a7518e5 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/db_transaction.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/db_transaction.go
@@ -282,8 +282,10 @@ func (db *DB) waitCompaction() error {
 // until in-flight transaction is committed or discarded.
 // The returned transaction handle is safe for concurrent use.
 //
-// Transaction is expensive and can overwhelm compaction, especially if
+// Transaction is very expensive and can overwhelm compaction, especially if
 // transaction size is small. Use with caution.
+// The rule of thumb is if you need to merge at least same amount of
+// `Options.WriteBuffer` worth of data then use transaction, otherwise don't.
 //
 // The transaction must be closed once done, either by committing or discarding
 // the transaction.
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/filter/bloom.go b/vendor/github.com/syndtr/goleveldb/leveldb/filter/bloom.go
index bab0e99705..56ccbfbeca 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/filter/bloom.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/filter/bloom.go
@@ -16,7 +16,7 @@ func bloomHash(key []byte) uint32 {
 
 type bloomFilter int
 
-// The bloom filter serializes its parameters and is backward compatible
+// Name: The bloom filter serializes its parameters and is backward compatible
 // with respect to them. Therefor, its parameters are not added to its
 // name.
 func (bloomFilter) Name() string {
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/memdb/memdb.go b/vendor/github.com/syndtr/goleveldb/leveldb/memdb/memdb.go
index b661c08a93..824e47f5f4 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/memdb/memdb.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/memdb/memdb.go
@@ -397,6 +397,10 @@ func (p *DB) Find(key []byte) (rkey, value []byte, err error) {
 // DB. And a nil Range.Limit is treated as a key after all keys in
 // the DB.
 //
+// WARNING: Any slice returned by interator (e.g. slice returned by calling
+// Iterator.Key() or Iterator.Key() methods), its content should not be modified
+// unless noted otherwise.
+//
 // The iterator must be released after use, by calling Release method.
 //
 // Also read Iterator documentation of the leveldb/iterator package.
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/opt/options.go b/vendor/github.com/syndtr/goleveldb/leveldb/opt/options.go
index 528b164233..c02c1e9788 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/opt/options.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/opt/options.go
@@ -278,6 +278,14 @@ type Options struct {
 	// The default is false.
 	DisableLargeBatchTransaction bool
 
+	// DisableSeeksCompaction allows disabling 'seeks triggered compaction'.
+	// The purpose of 'seeks triggered compaction' is to optimize database so
+	// that 'level seeks' can be minimized, however this might generate many
+	// small compaction which may not preferable.
+	//
+	// The default is false.
+	DisableSeeksCompaction bool
+
 	// ErrorIfExist defines whether an error should returned if the DB already
 	// exist.
 	//
@@ -309,6 +317,8 @@ type Options struct {
 	// IteratorSamplingRate defines approximate gap (in bytes) between read
 	// sampling of an iterator. The samples will be used to determine when
 	// compaction should be triggered.
+	// Use negative value to disable iterator sampling.
+	// The iterator sampling is disabled if DisableSeeksCompaction is true.
 	//
 	// The default is 1MiB.
 	IteratorSamplingRate int
@@ -526,6 +536,13 @@ func (o *Options) GetDisableLargeBatchTransaction() bool {
 	return o.DisableLargeBatchTransaction
 }
 
+func (o *Options) GetDisableSeeksCompaction() bool {
+	if o == nil {
+		return false
+	}
+	return o.DisableSeeksCompaction
+}
+
 func (o *Options) GetErrorIfExist() bool {
 	if o == nil {
 		return false
@@ -548,8 +565,10 @@ func (o *Options) GetFilter() filter.Filter {
 }
 
 func (o *Options) GetIteratorSamplingRate() int {
-	if o == nil || o.IteratorSamplingRate <= 0 {
+	if o == nil || o.IteratorSamplingRate == 0 {
 		return DefaultIteratorSamplingRate
+	} else if o.IteratorSamplingRate < 0 {
+		return 0
 	}
 	return o.IteratorSamplingRate
 }
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/session_compaction.go b/vendor/github.com/syndtr/goleveldb/leveldb/session_compaction.go
index f6030022de..4c1d336bef 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/session_compaction.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/session_compaction.go
@@ -14,6 +14,13 @@ import (
 	"github.com/syndtr/goleveldb/leveldb/opt"
 )
 
+const (
+	undefinedCompaction = iota
+	level0Compaction
+	nonLevel0Compaction
+	seekCompaction
+)
+
 func (s *session) pickMemdbLevel(umin, umax []byte, maxLevel int) int {
 	v := s.version()
 	defer v.release()
@@ -50,6 +57,7 @@ func (s *session) pickCompaction() *compaction {
 
 	var sourceLevel int
 	var t0 tFiles
+	var typ int
 	if v.cScore >= 1 {
 		sourceLevel = v.cLevel
 		cptr := s.getCompPtr(sourceLevel)
@@ -63,18 +71,24 @@ func (s *session) pickCompaction() *compaction {
 		if len(t0) == 0 {
 			t0 = append(t0, tables[0])
 		}
+		if sourceLevel == 0 {
+			typ = level0Compaction
+		} else {
+			typ = nonLevel0Compaction
+		}
 	} else {
 		if p := atomic.LoadPointer(&v.cSeek); p != nil {
 			ts := (*tSet)(p)
 			sourceLevel = ts.level
 			t0 = append(t0, ts.table)
+			typ = seekCompaction
 		} else {
 			v.release()
 			return nil
 		}
 	}
 
-	return newCompaction(s, v, sourceLevel, t0)
+	return newCompaction(s, v, sourceLevel, t0, typ)
 }
 
 // Create compaction from given level and range; need external synchronization.
@@ -109,13 +123,18 @@ func (s *session) getCompactionRange(sourceLevel int, umin, umax []byte, noLimit
 		}
 	}
 
-	return newCompaction(s, v, sourceLevel, t0)
+	typ := level0Compaction
+	if sourceLevel != 0 {
+		typ = nonLevel0Compaction
+	}
+	return newCompaction(s, v, sourceLevel, t0, typ)
 }
 
-func newCompaction(s *session, v *version, sourceLevel int, t0 tFiles) *compaction {
+func newCompaction(s *session, v *version, sourceLevel int, t0 tFiles, typ int) *compaction {
 	c := &compaction{
 		s:             s,
 		v:             v,
+		typ:           typ,
 		sourceLevel:   sourceLevel,
 		levels:        [2]tFiles{t0, nil},
 		maxGPOverlaps: int64(s.o.GetCompactionGPOverlaps(sourceLevel)),
@@ -131,6 +150,7 @@ type compaction struct {
 	s *session
 	v *version
 
+	typ           int
 	sourceLevel   int
 	levels        [2]tFiles
 	maxGPOverlaps int64
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/table/reader.go b/vendor/github.com/syndtr/goleveldb/leveldb/table/reader.go
index 16cfbaa006..496feb6fb4 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/table/reader.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/table/reader.go
@@ -787,6 +787,10 @@ func (r *Reader) getDataIterErr(dataBH blockHandle, slice *util.Range, verifyChe
 // table. And a nil Range.Limit is treated as a key after all keys in
 // the table.
 //
+// WARNING: Any slice returned by interator (e.g. slice returned by calling
+// Iterator.Key() or Iterator.Key() methods), its content should not be modified
+// unless noted otherwise.
+//
 // The returned iterator is not safe for concurrent use and should be released
 // after use.
 //
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/version.go b/vendor/github.com/syndtr/goleveldb/leveldb/version.go
index 2664560e1c..9535e35914 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/version.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/version.go
@@ -144,6 +144,7 @@ func (v *version) get(aux tFiles, ikey internalKey, ro *opt.ReadOptions, noValue
 	}
 
 	ukey := ikey.ukey()
+	sampleSeeks := !v.s.o.GetDisableSeeksCompaction()
 
 	var (
 		tset  *tSet
@@ -161,7 +162,7 @@ func (v *version) get(aux tFiles, ikey internalKey, ro *opt.ReadOptions, noValue
 	// Since entries never hop across level, finding key/value
 	// in smaller level make later levels irrelevant.
 	v.walkOverlapping(aux, ikey, func(level int, t *tFile) bool {
-		if level >= 0 && !tseek {
+		if sampleSeeks && level >= 0 && !tseek {
 			if tset == nil {
 				tset = &tSet{level, t}
 			} else {
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 06b4a2cf4f..7178864713 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -449,76 +449,76 @@
 			"revisionTime": "2017-07-05T02:17:15Z"
 		},
 		{
-			"checksumSHA1": "4NTmfUj7H5J59M2wCnp3/8FWt1I=",
+			"checksumSHA1": "bva7K+I3qF8NE32iIfBoXONPnL8=",
 			"path": "github.com/syndtr/goleveldb/leveldb",
-			"revision": "c3a204f8e96543bb0cc090385c001078f184fc46",
-			"revisionTime": "2019-03-18T03:00:20Z"
+			"revision": "81b91e5521e1d9f5d09677b8a940a5903385b2fa",
+			"revisionTime": "2019-09-19T06:41:59Z"
 		},
 		{
 			"checksumSHA1": "mPNraL2edpk/2FYq26rSXfMHbJg=",
 			"path": "github.com/syndtr/goleveldb/leveldb/cache",
-			"revision": "b001fa50d6b27f3f0bb175a87d0cb55426d0a0ae",
-			"revisionTime": "2018-11-28T10:09:59Z"
+			"revision": "81b91e5521e1d9f5d09677b8a940a5903385b2fa",
+			"revisionTime": "2019-09-19T06:41:59Z"
 		},
 		{
 			"checksumSHA1": "UA+PKDKWlDnE2OZblh23W6wZwbY=",
 			"path": "github.com/syndtr/goleveldb/leveldb/comparer",
-			"revision": "b001fa50d6b27f3f0bb175a87d0cb55426d0a0ae",
-			"revisionTime": "2018-11-28T10:09:59Z"
+			"revision": "81b91e5521e1d9f5d09677b8a940a5903385b2fa",
+			"revisionTime": "2019-09-19T06:41:59Z"
 		},
 		{
 			"checksumSHA1": "1DRAxdlWzS4U0xKN/yQ/fdNN7f0=",
 			"path": "github.com/syndtr/goleveldb/leveldb/errors",
-			"revision": "b001fa50d6b27f3f0bb175a87d0cb55426d0a0ae",
-			"revisionTime": "2018-11-28T10:09:59Z"
+			"revision": "81b91e5521e1d9f5d09677b8a940a5903385b2fa",
+			"revisionTime": "2019-09-19T06:41:59Z"
 		},
 		{
-			"checksumSHA1": "eqKeD6DS7eNCtxVYZEHHRKkyZrw=",
+			"checksumSHA1": "iBorxU3FBbau81WSyVa8KwcutzA=",
 			"path": "github.com/syndtr/goleveldb/leveldb/filter",
-			"revision": "b001fa50d6b27f3f0bb175a87d0cb55426d0a0ae",
-			"revisionTime": "2018-11-28T10:09:59Z"
+			"revision": "81b91e5521e1d9f5d09677b8a940a5903385b2fa",
+			"revisionTime": "2019-09-19T06:41:59Z"
 		},
 		{
 			"checksumSHA1": "hPyFsMiqZ1OB7MX+6wIAA6nsdtc=",
 			"path": "github.com/syndtr/goleveldb/leveldb/iterator",
-			"revision": "b001fa50d6b27f3f0bb175a87d0cb55426d0a0ae",
-			"revisionTime": "2018-11-28T10:09:59Z"
+			"revision": "81b91e5521e1d9f5d09677b8a940a5903385b2fa",
+			"revisionTime": "2019-09-19T06:41:59Z"
 		},
 		{
 			"checksumSHA1": "gJY7bRpELtO0PJpZXgPQ2BYFJ88=",
 			"path": "github.com/syndtr/goleveldb/leveldb/journal",
-			"revision": "b001fa50d6b27f3f0bb175a87d0cb55426d0a0ae",
-			"revisionTime": "2018-11-28T10:09:59Z"
+			"revision": "81b91e5521e1d9f5d09677b8a940a5903385b2fa",
+			"revisionTime": "2019-09-19T06:41:59Z"
 		},
 		{
-			"checksumSHA1": "MtYY1b2234y/MlS+djL8tXVAcQs=",
+			"checksumSHA1": "2ncG38FDk2thSlrHd7JFmiuvnxA=",
 			"path": "github.com/syndtr/goleveldb/leveldb/memdb",
-			"revision": "b001fa50d6b27f3f0bb175a87d0cb55426d0a0ae",
-			"revisionTime": "2018-11-28T10:09:59Z"
+			"revision": "81b91e5521e1d9f5d09677b8a940a5903385b2fa",
+			"revisionTime": "2019-09-19T06:41:59Z"
 		},
 		{
-			"checksumSHA1": "o2TorI3z+vc+EBMJ8XeFoUmXBtU=",
+			"checksumSHA1": "LC+WnyNq4O2J9SHuVfWL19wZH48=",
 			"path": "github.com/syndtr/goleveldb/leveldb/opt",
-			"revision": "b001fa50d6b27f3f0bb175a87d0cb55426d0a0ae",
-			"revisionTime": "2018-11-28T10:09:59Z"
+			"revision": "81b91e5521e1d9f5d09677b8a940a5903385b2fa",
+			"revisionTime": "2019-09-19T06:41:59Z"
 		},
 		{
 			"checksumSHA1": "ZnyuciM+R19NG8L5YS3TIJdo1e8=",
 			"path": "github.com/syndtr/goleveldb/leveldb/storage",
-			"revision": "b001fa50d6b27f3f0bb175a87d0cb55426d0a0ae",
-			"revisionTime": "2018-11-28T10:09:59Z"
+			"revision": "81b91e5521e1d9f5d09677b8a940a5903385b2fa",
+			"revisionTime": "2019-09-19T06:41:59Z"
 		},
 		{
-			"checksumSHA1": "gWFPMz8OQeul0t54RM66yMTX49g=",
+			"checksumSHA1": "DS0i9KReIeZn3T1Bpu31xPMtzio=",
 			"path": "github.com/syndtr/goleveldb/leveldb/table",
-			"revision": "b001fa50d6b27f3f0bb175a87d0cb55426d0a0ae",
-			"revisionTime": "2018-11-28T10:09:59Z"
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