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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15971) Regression: Random Read/WorkloadC slower in 1.x than 0.98
Date Sat, 11 Jun 2016 18:29:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15326000#comment-15326000
] 

stack commented on HBASE-15971:
-------------------------------

So, comparing the branches is not straightforward. They diverge too much with too many issues
effecting perf. Am walking up the two branches to find points of major transition to make
sure they made it over from 0.98 to branch-1. So far I am as far as, 0.98.4, which doubled
the random read throughput from about 180k to 335k all because of the unassumingly titled
HBASE-11355 "a couple of callQueue related improvements". Will be back after more digging.

> 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, flight_recording_10172402220203_28.branch-1.jfr, flight_recording_10172402220203_29.09820.0.98.20.jfr,
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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