Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18388#discussion_r124715080
--- Diff:
common/network-common/src/main/java/org/apache/spark/network/util/PooledByteBufAllocatorWithMetrics.java
---
@@ -0,0 +1,69 @@
+/*
+ * 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 org.apache.spark.network.util;
+
+import java.util.Iterator;
+import java.util.List;
+
+import io.netty.buffer.PoolArenaMetric;
+import io.netty.buffer.PoolChunkListMetric;
+import io.netty.buffer.PoolChunkMetric;
+import io.netty.buffer.PooledByteBufAllocator;
+
+/**
+ * A {@link PooledByteBufAllocator} providing some metrics.
+ */
+public class PooledByteBufAllocatorWithMetrics extends
PooledByteBufAllocator {
+
+ public PooledByteBufAllocatorWithMetrics(
+ boolean preferDirect,
+ int nHeapArena,
+ int nDirectArena,
+ int pageSize,
+ int maxOrder,
+ int tinyCacheSize,
+ int smallCacheSize,
+ int normalCacheSize) {
+ super(preferDirect, nHeapArena, nDirectArena, pageSize, maxOrder,
tinyCacheSize,
+ smallCacheSize, normalCacheSize);
+ }
+
+ public long offHeapUsage() {
+ return sumOfMetrics(directArenas());
+ }
+
+ public long onHeapUsage() {
+ return sumOfMetrics(heapArenas());
+ }
+
+ private long sumOfMetrics(List<PoolArenaMetric> metrics) {
+ long sum = 0;
+ for (int i = 0; i < metrics.size(); i++) {
+ PoolArenaMetric metric = metrics.get(i);
--- End diff --
nit: it's better to use `Iterator` pattern here, as the input list may not
be an indexed list and `list.get(i)` becomes `O(n)`.
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