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From "Anastasia Braginsky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19779) The chunk encountering the OOM will store in ChunkCreator forever
Date Sun, 14 Jan 2018 16:47:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16325668#comment-16325668

Anastasia Braginsky commented on HBASE-19779:

Let me explain how do I understand the problem.

What you are saying is that in case of OOM, the exception is thrown by chunk, after its ID
was already added to chunkIdMap. Therefore, MSLABImpl is not going to add it to chunks set
of MSLAB, and thus when recycleChunks() is called the chunk is not going to be given back
to ChunkCreator.

My question is what is the process to deal with OOM exception? Why do you assume recycleChunks()
will be properly called? If the region server process is going to be killed, its entire memory
should be freed, without specific GC process. As ChunkCreator is a singleton per Region Server
it is part of Region Server's static data, the entire memory address space of a process is
released when a process is killed.

So just to set my mind (I am most likely missing some details of the Region Server process),
can you please explain me why the chunk's memory is not going to be released?

> The chunk encountering the OOM will store in ChunkCreator forever
> -----------------------------------------------------------------
>                 Key: HBASE-19779
>                 URL: https://issues.apache.org/jira/browse/HBASE-19779
>             Project: HBase
>          Issue Type: Sub-task
>          Components: test
>            Reporter: Chia-Ping Tsai
>            Assignee: Chia-Ping Tsai
>            Priority: Minor
>             Fix For: 2.0.0-beta-2
>         Attachments: HBASE-19779.v0.patch, HBASE-19779.v1.patch
> If Chunk#init fail on OOM, the MSLABimpl won't store the id of chunk. We have no chance
to remove the chunk from {{ChunkCreator}} since MSLABimpl have missed the id.

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