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From "ramkrishna.s.vasudevan (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, 17 Jul 2017 07:03:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16089401#comment-16089401
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ramkrishna.s.vasudevan commented on HBASE-18375:
------------------------------------------------

I just added some comments in RB. Putting the same here -  When there is  a transfer to flat
map to chunkMap we were converting weak to strong ref right? Then why this problem happens?
Sorry if am missing something.

> 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
>            Priority: Critical
>             Fix For: 2.0.0, 3.0.0, 2.0.0-alpha-2
>
>         Attachments: HBASE-18375-V01.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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