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https://issues.apache.org/jira/browse/HDFS-6788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14083572#comment-14083572
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Hudson commented on HDFS-6788:
------------------------------
SUCCESS: Integrated in Hadoop-Hdfs-trunk #1825 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1825/])
HDFS-6788. Improve synchronization in BPOfferService with read write lock.
Contributed by Yongjun Zhang. (wang:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1615190)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPOfferService.java
> Improve synchronization in BPOfferService with read write lock
> --------------------------------------------------------------
>
> Key: HDFS-6788
> URL: https://issues.apache.org/jira/browse/HDFS-6788
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.5.0
> Reporter: Yongjun Zhang
> Assignee: Yongjun Zhang
> Fix For: 2.6.0
>
> Attachments: HDFS-6788.001.patch, HDFS-6788.002.patch
>
>
> Threads in DN (DataXceiver, PacketResponder, Async disk worker etc) may block
> at BPOfferService.getBlockPoolId() when calling BPOfferService.checkBlock(),
> though they are just reading the same blockpool id. This is unnecessary
> overhead and may cause performance hit when many threads compete. Filing this
> jira to replace synchronized method with read write lock
> (ReentrantReadWriteLock).
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