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From "Vladimir Rodionov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15513) hbase.hregion.memstore.chunkpool.maxsize is 0.0 by default
Date Tue, 22 Mar 2016 16:08:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15206660#comment-15206660
] 

Vladimir Rodionov commented on HBASE-15513:
-------------------------------------------

{quote}
So, this issue should be about doing a bit of testing of at least YCSB loadings to see that
enabling the pool is beneficial all around?
{quote}

[~saint.ack@gmail.com] Can you explain how not reusing buffers can improve performance and
latency? I am just trying to understand magic physics of "allocate buffer on every request"
approach. 

> hbase.hregion.memstore.chunkpool.maxsize is 0.0 by default
> ----------------------------------------------------------
>
>                 Key: HBASE-15513
>                 URL: https://issues.apache.org/jira/browse/HBASE-15513
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>             Fix For: 2.0.0
>
>
> That results in excessive MemStoreLAB chunk allocations because we can not reuse them.
Not sure, why it has been disabled, by default. May be the code has not been tested well?



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