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https://issues.apache.org/jira/browse/HBASE-4766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148163#comment-13148163
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Nicolas Spiegelberg commented on HBASE-4766:
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@stack : see r1181500 in https://svn.apache.org/repos/asf/hbase/branches/0.89-fb
> Add Instrumentation for Put Latencies at Critical Paths
> -------------------------------------------------------
>
> Key: HBASE-4766
> URL: https://issues.apache.org/jira/browse/HBASE-4766
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.94.0
> Reporter: Nicolas Spiegelberg
>
> Part of 89-fb to 92 port. Add instrumentation to collect:
> - memstore insert time
> - RWCC wait time (the time we wait after an write operation to, for RWCC read
> point to advance).
> - row lock acquisition time
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