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https://issues.apache.org/jira/browse/HBASE-19320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292059#comment-16292059
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Anoop Sam John commented on HBASE-19320:
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I see.. This is per BB size. hmm....
bq. So the max possible DBB size which can be cached in single ThreadLocal is
maxCacheSize * maxCachedBufferSize (worst case)
And the max possible total DBB size that the NIO can pool/cache can be
calculated as
maxCacheSize * maxCachedBufferSize * max possible ThreadLocals
max possible ThreadLocals = Reader threads in RpcServer.
This can be configured using 'hbase.ipc.server.read.threadpool.size'. Default
is 10 (Checked 2.0 only not sure 1.x having a diff default)
Just making myself learn this full context and adding that same here for ref
also :-)
Tks for the sharing [~huaxiang].
> document the mysterious direct memory leak in hbase
> ----------------------------------------------------
>
> Key: HBASE-19320
> URL: https://issues.apache.org/jira/browse/HBASE-19320
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 2.0.0, 1.2.6
> Reporter: huaxiang sun
> Assignee: huaxiang sun
> Attachments: HBASE-19320-master-v001.patch, Screen Shot 2017-11-21 at
> 4.43.36 PM.png, Screen Shot 2017-11-21 at 4.44.22 PM.png
>
>
> Recently we run into a direct memory leak case, which takes some time to
> trace and debug. Internally discussed with our [~saint....@gmail.com], we
> thought we had some findings and want to share with the community.
> Basically, it is the issue described in
> http://www.evanjones.ca/java-bytebuffer-leak.html and it happened to one of
> our hbase clusters.
> Create the jira first and will fill in more details later.
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