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https://issues.apache.org/jira/browse/HBASE-15971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-15971:
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Attachment: Screen Shot 2016-06-10 at 5.08.24 PM.png
Screen Shot 2016-06-10 at 5.08.26 PM.png
Comparing JFR output while under same load, the block seek takes more CPU when
passed the 1.0 Cell and heavy use of thread locals in 1.0 also seems to cost.
On the other hand, the locking/contention profile looks worse for 0.98 than for
1.0 with more time lost waiting on locks. It spends more time waiting on the
regionscanner registration lock than 1.0 and it has the LinkedList blocking
when doing a response.
> Regression: Random Read/WorkloadC slower in 1.x than 0.98
> ---------------------------------------------------------
>
> Key: HBASE-15971
> URL: https://issues.apache.org/jira/browse/HBASE-15971
> Project: HBase
> Issue Type: Sub-task
> Components: rpc
> Reporter: stack
> Assignee: stack
> Priority: Critical
> Attachments: 098.hits.png, 098.png, HBASE-15971.branch-1.001.patch,
> Screen Shot 2016-06-10 at 5.08.24 PM.png, Screen Shot 2016-06-10 at 5.08.26
> PM.png, branch-1.hits.png, branch-1.png, handlers.fp.png, hits.fp.png,
> hits.patched1.0.vs.unpatched1.0.vs.098.png, run_ycsb.sh
>
>
> branch-1 is slower than 0.98 doing YCSB random read/workloadC. It seems to be
> doing about 1/2 the throughput of 0.98.
> In branch-1, we have low handler occupancy compared to 0.98. Hacking in
> reader thread occupancy metric, is about the same in both. In parent issue,
> hacking out the scheduler, I am able to get branch-1 to go 3x faster so will
> dig in here.
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