Remove re-implementation of BytesBuffer pool

pkg/ingester/checkpoint.go

@@ -18,23 +18,26 @@ import (
 	tsdb_errors "github.com/prometheus/prometheus/tsdb/errors"
 	"github.com/prometheus/prometheus/tsdb/fileutil"
 	"github.com/prometheus/prometheus/tsdb/wlog"
-	prompool "github.com/prometheus/prometheus/util/pool"
+	"github.com/prometheus/prometheus/util/pool"
 
 	"github.com/grafana/loki/pkg/chunkenc"
 	"github.com/grafana/loki/pkg/ingester/wal"
 	"github.com/grafana/loki/pkg/logproto"
 	util_log "github.com/grafana/loki/pkg/util/log"
-	"github.com/grafana/loki/pkg/util/pool"
 )
 
 var (
 	// todo(ctovena) those pools should be in factor of the actual configuration (blocksize, targetsize).
 	// Starting with something sane first then we can refine with more experience.
 
 	// Buckets [1KB 2KB 4KB 16KB 32KB  to 4MB] by 2
-	chunksBufferPool = pool.NewBuffer(1024, 4*1024*1024, 2)
+	chunksBufferPool = pool.New(1024, 4*1024*1024, 2, func(i int) interface{} {
+		return bytes.NewBuffer(make([]byte, 0, i))
+	})
 	// Buckets [64B 128B 256B 512B... to 2MB] by 2
-	headBufferPool = pool.NewBuffer(64, 2*1024*1024, 2)
+	headBufferPool = pool.New(64, 2*1024*1024, 2, func(i int) interface{} {
+		return bytes.NewBuffer(make([]byte, 0, i))
+	})
 )
 
 type chunkWithBuffer struct {
@@ -62,6 +65,11 @@ func toWireChunks(descs []chunkDesc, wireChunks []chunkWithBuffer) ([]chunkWithB
 		from, to := d.chunk.Bounds()
 		chunkSize, headSize := d.chunk.CheckpointSize()
 
+		blocks := chunksBufferPool.Get(chunkSize).(*bytes.Buffer)
+		blocks.Reset()
+		head := headBufferPool.Get(headSize).(*bytes.Buffer)
+		head.Reset()
+
 		wireChunk := chunkWithBuffer{
 			Chunk: Chunk{
 				From:        from,
@@ -71,8 +79,8 @@ func toWireChunks(descs []chunkDesc, wireChunks []chunkWithBuffer) ([]chunkWithB
 				LastUpdated: d.lastUpdated,
 				Synced:      d.synced,
 			},
-			blocks: chunksBufferPool.Get(chunkSize),
-			head:   headBufferPool.Get(headSize),
+			blocks: blocks,
+			head:   head,
 		}
 
 		err := d.chunk.SerializeForCheckpointTo(
@@ -361,7 +369,7 @@ func (w *WALCheckpointWriter) Advance() (bool, error) {
 }
 
 // Buckets [64KB to 256MB] by 2
-var recordBufferPool = prompool.New(1<<16, 1<<28, 2, func(size int) interface{} { return make([]byte, 0, size) })
+var recordBufferPool = pool.New(1<<16, 1<<28, 2, func(size int) interface{} { return make([]byte, 0, size) })
 
 func (w *WALCheckpointWriter) Write(s *Series) error {
 	size := s.Size() + 1 // +1 for header