[jira] [Updated] (HBASE-15971) Regression: Random Read/WorkloadC slower in 1.x than 0.98

["Biju Nair (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-15971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Biju Nair updated HBASE-15971:
------------------------------
    Component/s: Scheduler

> 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, Scheduler
>    Affects Versions: 1.3.0, 2.0.0
>            Reporter: stack
>            Assignee: stack
>            Priority: Critical
>             Fix For: 1.3.0, 2.0.0
>
>         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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