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https://issues.apache.org/jira/browse/HBASE-18686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amit Patel updated HBASE-18686:
-------------------------------
Description:
Based on [performance benchmarks on the
clocks|https://issues.apache.org/jira/browse/HBASE-18542?focusedCommentId=16141932&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16141932],
the Clock#now and Clock#update methods of the HLC implementation are costly in
multithreaded scenarios especially due to synchronization around the entire
methods.
Thus we need an improved implementation of Clock#now and Clock#update such that
it would perform better in the presence of multiple threads.
was:Based on [performance benchmarks on the
clocks|https://issues.apache.org/jira/browse/HBASE-18542?focusedCommentId=16141932&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16141932],
the Clock#now and Clock#update methods of the HLC implementation are costly in
multithreaded scenarios especially due to synchronization around the entire
methods. Thus we need an improved implementation of Clock#now and Clock#update
such that it would perform better in the presence of multiple threads.
> Improve HLC implementation performance
> --------------------------------------
>
> Key: HBASE-18686
> URL: https://issues.apache.org/jira/browse/HBASE-18686
> Project: HBase
> Issue Type: Sub-task
> Reporter: Amit Patel
> Priority: Critical
>
> Based on [performance benchmarks on the
> clocks|https://issues.apache.org/jira/browse/HBASE-18542?focusedCommentId=16141932&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16141932],
> the Clock#now and Clock#update methods of the HLC implementation are costly
> in multithreaded scenarios especially due to synchronization around the
> entire methods.
> Thus we need an improved implementation of Clock#now and Clock#update such
> that it would perform better in the presence of multiple threads.
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