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From "Anastasia Braginsky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18375) The pool chunks from ChunkCreator are deallocated while in pool because there is no reference to them
Date Mon, 21 Aug 2017 11:17:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16135042#comment-16135042
] 

Anastasia Braginsky commented on HBASE-18375:
---------------------------------------------

Hey,

I have a patch for branch-2. The patch is very similar, but it is not identical to the patch
I applied to master.
What should I do so Hadoop QA runs over it? 
>From my experience, the tests I run on my machine and Hadoop QA often show different results....

> The pool chunks from ChunkCreator are deallocated while in pool because there is no reference
to them
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-18375
>                 URL: https://issues.apache.org/jira/browse/HBASE-18375
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 2.0.0-alpha-1
>            Reporter: Anastasia Braginsky
>            Assignee: Anastasia Braginsky
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: HBASE-18375-V01.patch, HBASE-18375-V02.patch, HBASE-18375-V03.patch,
HBASE-18375-V04.patch, HBASE-18375-V05.patch, HBASE-18375-V06.patch, HBASE-18375-V07.patch,
HBASE-18375-V08.patch, HBASE-18375-V09.patch, HBASE-18375-V10.patch, HBASE-18375-V11.patch
>
>
> Because MSLAB list of chunks was changed to list of chunk IDs, the chunks returned back
to pool can be deallocated by JVM because there is no reference to them. The solution is to
protect pool chunks from GC by the strong map of ChunkCreator introduced by HBASE-18010. Will
prepare the patch today.



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