[jira] [Resolved] (HIVE-2729) Hive sets thread's ContextClassLoader to null

["Todd Lipcon (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-2729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon resolved HIVE-2729.
-------------------------------

    Resolution: Invalid

Sorry, it turns out this wasn't Hive's fault after all. The issue was with a corner case of JNI usage - probably the same corner case that caused HIVE-2163. If the first thread to use libhdfs isn't the same thread that started the JVM from C code, then the thread's context classloader will be null.
                
> Hive sets thread's ContextClassLoader to null
> ---------------------------------------------
>
>                 Key: HIVE-2729
>                 URL: https://issues.apache.org/jira/browse/HIVE-2729
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.8.1
>            Reporter: Carl Steinbach
>
> From HIVE-2163:
> https://issues.apache.org/jira/browse/HIVE-2163?focusedCommentId=13188876&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13188876
> {quote}
> We came across this same issue in another scenario - it looks like Hive is somewhere setting the thread's ContextClassLoader to null. I opened HADOOP-7982 to work around the issue from the Hadoop side, but I think Hive must have a bug that causes these problems.
> ...
> Unfortunately the other situation was integrated into some non-open-source software, so it's not easy to reproduce. It does make use of the Hive metadata, so my guess is that calling into some SessionState code (as described above in this ticket) was the culprit. I did verify that the ContextClassLoader was set to null which is what caused the problem, I just couldn't tell how it got that way.
> {quote}

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