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https://issues.apache.org/jira/browse/HDFS-7531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14251773#comment-14251773
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Hudson commented on HDFS-7531:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #46 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/46/])
HDFS-7531. Improve the concurrent access on FsVolumeList (Lei Xu via Colin P.
McCabe) (cmccabe: rev 3b173d95171d01ab55042b1162569d1cf14a8d43)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeList.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
> Improve the concurrent access on FsVolumeList
> ---------------------------------------------
>
> Key: HDFS-7531
> URL: https://issues.apache.org/jira/browse/HDFS-7531
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.6.0
> Reporter: Lei (Eddy) Xu
> Assignee: Lei (Eddy) Xu
> Fix For: 2.7.0
>
> Attachments: HDFS-7531.000.patch, HDFS-7531.001.patch,
> HDFS-7531.002.patch
>
>
> {{FsVolumeList}} uses {{synchronized}} to protect the update on
> {{FsVolumeList#volumes}}, while various operations (e.g., {{checkDirs()}},
> {{getAvailable()}}) iterate {{volumes}} without protection.
> This JIRA proposes to use {{AtomicReference}} to encapture {{volumes}} to
> provide better concurrent access.
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