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https://issues.apache.org/jira/browse/HBASE-2997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909480#action_12909480
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ryan rawson commented on HBASE-2997:
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there are 5 small fixes that improve performance:
- HCD has a sync block causing contention to get a _FINAL_ value that never
changes (!!!!!)
- HeapByteBuffer.getInt() is surprisingly slow
- Cache calculated values in KeyValue for cpu time improvements
- do an earlier out in loops of Memstore.updateColumn
- pre-create metrics and remove a sync block in HBaseRpcMetrics
all of these show demonstrated improvement in my profiler.
> Performance fixes - profiler driven
> -----------------------------------
>
> Key: HBASE-2997
> URL: https://issues.apache.org/jira/browse/HBASE-2997
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.89.20100621
> Reporter: ryan rawson
> Assignee: ryan rawson
> Priority: Critical
> Fix For: 0.90.0
>
> Attachments: HBASE-2997-1.txt, HBASE-2997-2.txt, HBASE-2997-3.txt,
> HBASE-2997-4.txt, HBASE-2997-5.txt
>
>
> while profiling hbase I found a number of slow pieces. Here are fixes for
> them.
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