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https://issues.apache.org/jira/browse/HADOOP-18105?focusedWorklogId=774787&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-774787
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ASF GitHub Bot logged work on HADOOP-18105:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 25/May/22 19:40
Start Date: 25/May/22 19:40
Worklog Time Spent: 10m
Work Description: mukund-thakur commented on code in PR #4263:
URL: https://github.com/apache/hadoop/pull/4263#discussion_r882046723
##########
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/TestMoreWeakReferencedElasticByteBufferPool.java:
##########
@@ -0,0 +1,93 @@
+/**
+ * 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.hadoop.io;
+
+import java.nio.BufferOverflowException;
+import java.nio.ByteBuffer;
+
+import org.assertj.core.api.Assertions;
+import org.junit.Test;
+
+import org.apache.hadoop.test.HadoopTestBase;
+
+import static org.apache.hadoop.test.LambdaTestUtils.intercept;
+
+/**
+ * Non parameterized tests for {@code WeakReferencedElasticByteBufferPool}.
+ */
+public class TestMoreWeakReferencedElasticByteBufferPool
Review Comment:
Null buffers? Is that a valid case. I can add a precondition on the incoming
buffer and throw NPE with a message. Right now yes it fails with NPE.
Issue Time Tracking
-------------------
Worklog Id: (was: 774787)
Time Spent: 3h 20m (was: 3h 10m)
> Implement a variant of ElasticByteBufferPool which uses weak references for
> garbage collection.
> -----------------------------------------------------------------------------------------------
>
> Key: HADOOP-18105
> URL: https://issues.apache.org/jira/browse/HADOOP-18105
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: common, fs
> Reporter: Mukund Thakur
> Assignee: Mukund Thakur
> Priority: Major
> Labels: pull-request-available
> Time Spent: 3h 20m
> Remaining Estimate: 0h
>
> Currently in hadoop codebase, we have two classes which implements byte
> buffers pooling.
> One is ElasticByteBufferPool which doesn't use weak references and thus could
> cause memory leaks in production environment.
> Other is DirectBufferPool which uses weak references but doesn't support
> caller's preference for either on-heap or off-heap buffers.
>
> The idea is to create an improved version of ElasticByteBufferPool by
> subclassing it ( as it is marked as public and stable and used widely in hdfs
> ) with essential functionalities required for effective buffer pooling. This
> is important for the parent Vectored IO work.
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