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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7409) Add workaround for a deadlock issue of Class.getAnnotation()
Date Thu, 17 Jul 2014 13:55:05 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14064934#comment-14064934
] 

Xuefu Zhang commented on HIVE-7409:
-----------------------------------

[~ozawa] Thanks for sharing your research result. I compared [~navis]'s changes with yours.
1. he identified more places of changes. 2. your synchronization is all on UDFType.class,
yet Navis' synchronization happens on different classes. What's your thoughts on this?

> Add workaround for a deadlock issue of Class.getAnnotation() 
> -------------------------------------------------------------
>
>                 Key: HIVE-7409
>                 URL: https://issues.apache.org/jira/browse/HIVE-7409
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>         Attachments: HIVE-7409.1.patch, HIVE-7409.2.patch.txt, stacktrace.txt
>
>
> [JDK-7122142|https://bugs.openjdk.java.net/browse/JDK-7122142] mentions that there is
a race condition in getAnnotations. This problem can lead deadlock. The fix on JDK will be
merged on jdk8, but hive supports jdk6/jdk7 currently. Therefore, we should add workaround
to avoid the issue.



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