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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7205) Coprocessor classloader is replicated for all regions in the HRegionServer
Date Sat, 08 Dec 2012 19:47:22 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13527245#comment-13527245
] 

Ted Yu commented on HBASE-7205:
-------------------------------

When classLoadersCache.remove(path) is added in the catch block, I got:
{code}
testClassLoadingFromHDFS(org.apache.hadoop.hbase.coprocessor.TestClassLoading)  Time elapsed:
9.779 sec  <<< FAILURE!
java.lang.AssertionError: Some CP classloaders for region TestClassLoading,,1354995818580.7fbabc669828f0c6435df9b6c0a57709.
are not cached. ClassLoader Cache:[org.apache.hadoop.hbase.coprocessor.CoprocessorClassLoader@6cd86cae,
org.apache.hadoop.hbase.coprocessor.CoprocessorClassLoader@7b0c81a6] Region ClassLoaders:[org.apache.hadoop.hbase.coprocessor.CoprocessorClassLoader@29ab0eef,
org.apache.hadoop.hbase.coprocessor.CoprocessorClassLoader@7b0c81a6]
  at org.junit.Assert.fail(Assert.java:93)
  at org.junit.Assert.assertTrue(Assert.java:43)
  at org.apache.hadoop.hbase.coprocessor.TestClassLoading.testClassLoadingFromHDFS(TestClassLoading.java:294)
{code}
Will take a closer look.
                
> Coprocessor classloader is replicated for all regions in the HRegionServer
> --------------------------------------------------------------------------
>
>                 Key: HBASE-7205
>                 URL: https://issues.apache.org/jira/browse/HBASE-7205
>             Project: HBase
>          Issue Type: Bug
>          Components: Coprocessors
>    Affects Versions: 0.92.2, 0.94.2
>            Reporter: Adrian Muraru
>            Assignee: Ted Yu
>            Priority: Critical
>             Fix For: 0.96.0, 0.94.4
>
>         Attachments: 7205-v1.txt, 7205-v3.txt, 7205-v4.txt, 7205-v5.txt, 7205-v6.txt,
7205-v7.txt, 7205-v8.txt, HBASE-7205_v2.patch
>
>
> HBASE-6308 introduced a new custom CoprocessorClassLoader to load the coprocessor classes
and a new instance of this CL is created for each single HRegion opened. This leads to OOME-PermGen
when the number of regions go above hundres / region server. 
> Having the table coprocessor jailed in a separate classloader is good however we should
create only one for all regions of a table in each HRS.

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