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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14613) Remove MemStoreChunkPool?
Date Sat, 26 Mar 2016 06:46:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15212845#comment-15212845
] 

Lars Hofhansl commented on HBASE-14613:
---------------------------------------

Didn't think my musing about G1 and MSLAB would lead to a long a useful discussion :)

Should we set InitiatingHeapOccupancyPercent based on configuration? By default we allow 40%
of the heap for block cache and 40% for the memstore. When configured such, should we set
InitiatingHeapOccupancyPercent to 80? Or maybe if we assume the memstores are on average 1/2
filled maybe this reasoning would lead to 60% as a good default...?

> Remove MemStoreChunkPool?
> -------------------------
>
>                 Key: HBASE-14613
>                 URL: https://issues.apache.org/jira/browse/HBASE-14613
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Lars Hofhansl
>            Priority: Minor
>         Attachments: 14613-0.98.txt, gc.png, writes.png
>
>
> I just stumbled across MemStoreChunkPool. The idea behind is to reuse chunks of allocations
rather than letting the GC handle this.
> Now, it's off by default, and it seems to me to be of dubious value. I'd recommend just
removing it.



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