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https://issues.apache.org/jira/browse/HDFS-3860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464677#comment-13464677
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Hudson commented on HDFS-3860:
------------------------------
Integrated in Hadoop-Hdfs-0.23-Build #387 (See
[https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/387/])
svn merge -c 1378228 FIXES: HDFS-3860. HeartbeatManager#Monitor may wrongly
hold the writelock of namesystem. Contributed by Jing Zhao. (Revision 1390632)
Result = UNSTABLE
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1390632
Files :
*
/hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/HeartbeatManager.java
> HeartbeatManager#Monitor may wrongly hold the writelock of namesystem
> ---------------------------------------------------------------------
>
> Key: HDFS-3860
> URL: https://issues.apache.org/jira/browse/HDFS-3860
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Fix For: 0.23.4, 2.0.2-alpha
>
> Attachments: HDFS-3860.patch, HDFS-heartbeat-testcase.patch
>
>
> In HeartbeatManager#heartbeatCheck, if some dead datanode is found, the
> monitor thread will acquire the write lock of namesystem, and recheck the
> safemode. If it is in safemode, the monitor thread will return from the
> heartbeatCheck function without release the write lock. This may cause the
> monitor thread wrongly holding the write lock forever.
> The attached test case tries to simulate this bad scenario.
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