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https://issues.apache.org/jira/browse/HADOOP-8684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464672#comment-13464672
]
Hudson commented on HADOOP-8684:
--------------------------------
Integrated in Hadoop-Hdfs-0.23-Build #387 (See
[https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/387/])
svn merge -c 1379506 FIXES: HADOOP-8684. Deadlock between
WritableComparator and WritableComparable. Contributed by Jing Zhao (Revision
1390677)
Result = UNSTABLE
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1390677
Files :
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
*
/hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/WritableComparator.java
> Deadlock between WritableComparator and WritableComparable
> ----------------------------------------------------------
>
> Key: HADOOP-8684
> URL: https://issues.apache.org/jira/browse/HADOOP-8684
> Project: Hadoop Common
> Issue Type: Bug
> Components: io
> Affects Versions: 1.0.3, 3.0.0
> Reporter: Hiroshi Ikeda
> Assignee: Jing Zhao
> Priority: Minor
> Fix For: 3.0.0, 0.23.4, 2.0.3-alpha
>
> Attachments: Hadoop-8684.patch, Hadoop-8684.patch, Hadoop-8684.patch,
> Hadoop-8684.patch, Hadoop-8684.patch, WritableComparatorDeadLockTestApp.java
>
>
> Classes implementing WriableComparable in Hadoop call the method
> WritableComparator.define() in their static initializers. This means, the
> classes call the method define() while thier class loading, under locking
> their class objects. And, the method WritableComparator.define() locks the
> WritableComaprator class object.
> On the other hand, WritableComparator.get() also locks the WritableComparator
> class object, and the method may create instances of the targeted comparable
> class, involving loading the targeted comparable class if any. This means,
> the method might try to lock the targeted comparable class object under
> locking the WritableComparator class object.
> There are reversed orders of locking objects, and you might fall in deadlock.
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