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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 Tue, 14 Jun 2016 18:32:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15330106#comment-15330106
] 

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

I do not want to purge deadline. It could be made more useful later. It could also be made
less costly in implementation. For those who have it explicitly set, it is hard to figure
intent. Can we call this out as an incompatible change in the release notes?  Hopefully that
will get folks attention?

> 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
>    Affects Versions: 2.0.0, 1.3.0
>            Reporter: stack
>            Assignee: stack
>            Priority: Critical
>         Attachments: 098.hits.png, 098.png, HBASE-15971.branch-1.001.patch, HBASE-15971.branch-1.002.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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