feat(s3stream): stats bytebuf alloc

s3stream/src/main/java/com/automq/stream/s3/DirectByteBufAlloc.java

@@ -17,6 +17,7 @@
 
 package com.automq.stream.s3;
 
+import com.automq.stream.s3.metrics.stats.ByteBufMetricsStats;
 import com.automq.stream.utils.Threads;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.CompositeByteBuf;
@@ -38,7 +39,14 @@ public static CompositeByteBuf compositeByteBuffer() {
     }
 
     public static ByteBuf byteBuffer(int initCapacity) {
+        return byteBuffer(initCapacity, null);
+    }
+
+    public static ByteBuf byteBuffer(int initCapacity, String name) {
         try {
+            if (name != null) {
+                ByteBufMetricsStats.getHistogram(name).update(initCapacity);
+            }
             return ALLOC.directBuffer(initCapacity);
         } catch (OutOfMemoryError e) {
             for (;;) {

s3stream/src/main/java/com/automq/stream/s3/ObjectWriter.java

@@ -206,7 +206,8 @@ class IndexBlock {
 
             public IndexBlock() {
                 long nextPosition = 0;
-                buf = DirectByteBufAlloc.byteBuffer(1024 * 1024);
+                int indexBlockSize = 4 + (8 + 4 + 4 + 8 + 8 + 4 + 4) * completedBlocks.size();
+                buf = DirectByteBufAlloc.byteBuffer(indexBlockSize, "write_index_block");
                 buf.writeInt(completedBlocks.size()); // block count
                 // block index
                 for (DataBlock block : completedBlocks) {

s3stream/src/main/java/com/automq/stream/s3/S3Storage.java

@@ -217,6 +217,8 @@ public void shutdown() {
     public CompletableFuture<Void> append(StreamRecordBatch streamRecord) {
         TimerUtil timerUtil = new TimerUtil();
         CompletableFuture<Void> cf = new CompletableFuture<>();
+        // encoded before append to free heap ByteBuf.
+        streamRecord.encoded();
         WalWriteRequest writeRequest = new WalWriteRequest(streamRecord, -1L, cf);
         handleAppendRequest(writeRequest);
         append0(writeRequest, false);
@@ -250,7 +252,6 @@ public boolean append0(WalWriteRequest request, boolean fromBackoff) {
         WriteAheadLog.AppendResult appendResult;
         try {
             StreamRecordBatch streamRecord = request.record;
-            streamRecord.encoded();
             streamRecord.retain();
             appendResult = log.append(streamRecord.encoded());
         } catch (WriteAheadLog.OverCapacityException e) {

s3stream/src/main/java/com/automq/stream/s3/compact/operator/DataBlockWriter.java

@@ -145,7 +145,7 @@ class IndexBlock {
 
         public IndexBlock() {
             position = nextDataBlockPosition;
-            buf = DirectByteBufAlloc.byteBuffer(calculateIndexBlockSize());
+            buf = DirectByteBufAlloc.byteBuffer(calculateIndexBlockSize(), "write_index_block");
             buf.writeInt(completedBlocks.size()); // block count
             long nextPosition = 0;
             // block index

s3stream/src/main/java/com/automq/stream/s3/metrics/operations/S3Operation.java

@@ -67,9 +67,11 @@ public enum S3Operation {
     COMMIT_STREAM_OBJECT(S3MetricsType.S3Object, "commit_stream_object"),
     GET_OBJECTS(S3MetricsType.S3Object, "get_objects"),
     GET_SERVER_OBJECTS(S3MetricsType.S3Object, "get_server_objects"),
-    GET_STREAM_OBJECTS(S3MetricsType.S3Object, "get_stream_objects");
+    GET_STREAM_OBJECTS(S3MetricsType.S3Object, "get_stream_objects"),
     /* S3 object operations end */
 
+    ALLOC_BUFFER(S3MetricsType.S3Storage, "alloc_buffer");
+
     private final S3MetricsType type;
     private final String name;
     private final String uniqueKey;

s3stream/src/main/java/com/automq/stream/s3/metrics/stats/ByteBufMetricsStats.java

@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.automq.stream.s3.metrics.stats;
+
+import com.automq.stream.s3.metrics.Histogram;
+import com.automq.stream.s3.metrics.S3StreamMetricsRegistry;
+import com.automq.stream.s3.metrics.operations.S3MetricsType;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class ByteBufMetricsStats {
+    private static final Map<String, Histogram> SOURCE_TO_HISTOGRAM = new ConcurrentHashMap<>();
+
+    public static Histogram getHistogram(String source) {
+        return SOURCE_TO_HISTOGRAM.computeIfAbsent(source, k -> {
+            Map<String, String> tags = Map.of("source", k);
+            return S3StreamMetricsRegistry.getMetricsGroup().newHistogram(S3MetricsType.S3Storage.getName(),
+                    S3MetricsType.S3Storage.getName() + "size", tags);
+        });
+    }
+}

s3stream/src/main/java/com/automq/stream/s3/operator/DefaultS3Operator.java

@@ -236,7 +236,7 @@ void mergedRangeRead0(String path, long start, long end, CompletableFuture<ByteB
                 .thenAccept(responsePublisher -> {
                     OperationMetricsStats.getOrCreateOperationMetrics(S3Operation.GET_OBJECT).operationCount.inc();
                     OperationMetricsStats.getOrCreateOperationMetrics(S3Operation.GET_OBJECT).operationTime.update(timerUtil.elapsed());
-                    ByteBuf buf = DirectByteBufAlloc.byteBuffer((int) (end - start + 1));
+                    ByteBuf buf = DirectByteBufAlloc.byteBuffer((int) (end - start + 1), "merge_read");
                     responsePublisher.subscribe(buf::writeBytes).thenAccept(v -> cf.complete(buf));
                 })
                 .exceptionally(ex -> {