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https://issues.apache.org/jira/browse/HBASE-5349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13847167#comment-13847167
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Anoop Sam John commented on HBASE-5349:
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By default the auto tuning is turned off. One need to give the below 4 configs
so as to define the range of heap %.
"hbase.regionserver.global.memstore.size.max.range" and
"hbase.regionserver.global.memstore.size.min.range" using which one can specify
the total heap % within which the memstore size can vary.
"hfile.block.cache.size.max.range" and "hfile.block.cache.size.min.range" using
which one can specify the total heap % within which the block cache size can
vary.
There is no default values for these and so by default there wont be automatic
tuning happening.
Is that good enough [~xieliang007]
> Automagically tweak global memstore and block cache sizes based on workload
> ---------------------------------------------------------------------------
>
> Key: HBASE-5349
> URL: https://issues.apache.org/jira/browse/HBASE-5349
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.92.0
> Reporter: Jean-Daniel Cryans
> Assignee: Anoop Sam John
> Fix For: 0.99.0
>
> Attachments: HBASE-5349_V2.patch, HBASE-5349_V3.patch,
> HBASE-5349_V4.patch, HBASE-5349_V5.patch, WIP_HBASE-5349.patch
>
>
> Hypertable does a neat thing where it changes the size given to the CellCache
> (our MemStores) and Block Cache based on the workload. If you need an image,
> scroll down at the bottom of this link:
> http://www.hypertable.com/documentation/architecture/
> That'd be one less thing to configure.
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