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https://issues.apache.org/jira/browse/HDFS-7944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389157#comment-14389157
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Hudson commented on HDFS-7944:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk #2099 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2099/])
HDFS-7944. Minor cleanup of BlockPoolManager#getAllNamenodeThreads. (Arpit
Agarwal) (arp: rev 85dc3c14b2ca4b01a93361bb925c39a22a6fd8db)
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBlockRecovery.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDeleteBlockPool.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBlockScanner.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeMultipleRegistrations.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestTriggerBlockReport.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeExit.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestRefreshNamenodes.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestIncrementalBlockReports.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDatanodeProtocolRetryPolicy.java
> Minor cleanup of BlockPoolManager#getAllNamenodeThreads
> -------------------------------------------------------
>
> Key: HDFS-7944
> URL: https://issues.apache.org/jira/browse/HDFS-7944
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.6.0
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Priority: Minor
> Fix For: 2.8.0
>
> Attachments: HDFS-7944.01.patch, HDFS-7944.02.patch
>
>
> {{BlockPoolManager#getAllNamenodeThreads}} can avoid unnecessary list to
> array conversion and vice versa by returning an unmodifiable list.
> Since NN addition/removal is relatively rare we can just use a
> {{CopyOnWriteArrayList}} for concurrency.
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