[jira] [Commented] (HIVE-4574) XMLEncoder thread safety issues in openjdk7 causes HiveServer2 to be stuck

["Steven Wong (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-4574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13845856#comment-13845856 ] 

Steven Wong commented on HIVE-4574:
-----------------------------------

[https://bugs.openjdk.java.net/browse/JDK-8028054] now says that the bug is fixed in 8 and backported to 7u60.

> XMLEncoder thread safety issues in openjdk7 causes HiveServer2 to be stuck
> --------------------------------------------------------------------------
>
>                 Key: HIVE-4574
>                 URL: https://issues.apache.org/jira/browse/HIVE-4574
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>    Affects Versions: 0.11.0, 0.12.0
>            Reporter: Thejas M Nair
>            Assignee: Thejas M Nair
>         Attachments: HIVE-4574.1.patch
>
>
> In open jdk7, XMLEncoder.writeObject call leads to calls to java.beans.MethodFinder.findMethod(). MethodFinder class not thread safe because it uses a static WeakHashMap that would get used from multiple threads. See -
> http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7-b147/com/sun/beans/finder/MethodFinder.java#46
> Concurrent access to HashMap implementation that are not thread safe can sometimes result in infinite-loops and other problems. If jdk7 is in use, it makes sense to synchronize calls to XMLEncoder.writeObject .



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