Revert "limit write concurrency of leveldb to max open file handles limit"

This reverts commit 8d2d380676.

chunks/leveldb_store.go

@@ -22,10 +22,9 @@ func toChunkKey(r ref.Ref) []byte {
 }
 
 type LevelDBStore struct {
-	db                   *leveldb.DB
-	mu                   *sync.Mutex
-	putCount             int // for testing
-	concurrentWriteLimit chan struct{}
+	db       *leveldb.DB
+	mu       *sync.Mutex
+	putCount int // for testing
 }
 
 func NewLevelDBStore(dir string, maxFileHandles int) *LevelDBStore {
@@ -35,15 +34,10 @@ func NewLevelDBStore(dir string, maxFileHandles int) *LevelDBStore {
 		Compression:            opt.NoCompression,
 		Filter:                 filter.NewBloomFilter(10), // 10 bits/key
 		OpenFilesCacheCapacity: maxFileHandles,
-		WriteBuffer:            1 << 24, // 16MiB,
+		WriteBuffer:            1 << 24, // 16MiB
 	})
 	d.Chk.NoError(err)
-	return &LevelDBStore{
-		db,
-		&sync.Mutex{},
-		0,
-		make(chan struct{}, maxFileHandles),
-	}
+	return &LevelDBStore{db, &sync.Mutex{}, 0}
 }
 
 func (l *LevelDBStore) Root() ref.Ref {
@@ -92,11 +86,9 @@ func (l *LevelDBStore) Put(c Chunk) {
 		return
 	}
 
-	l.concurrentWriteLimit <- struct{}{}
 	err := l.db.Put(toChunkKey(c.Ref()), c.Data(), nil)
 	d.Chk.NoError(err)
 	l.putCount += 1
-	<-l.concurrentWriteLimit
 }
 
 func (l *LevelDBStore) Close() error {

http/http_server.go

@@ -23,15 +23,16 @@ const (
 )
 
 type httpServer struct {
-	cs    chunks.ChunkStore
-	port  int
-	l     *net.Listener
-	conns map[net.Conn]http.ConnState
+	cs         chunks.ChunkStore
+	port       int
+	l          *net.Listener
+	conns      map[net.Conn]http.ConnState
+	writeLimit chan struct{}
 }
 
 func NewHttpServer(cs chunks.ChunkStore, port int) *httpServer {
 	return &httpServer{
-		cs, port, nil, map[net.Conn]http.ConnState{},
+		cs, port, nil, map[net.Conn]http.ConnState{}, make(chan struct{}, maxConcurrentPuts),
 	}
 }