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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 Sun, 12 Jun 2016 04:28:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15326180#comment-15326180
] 

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

bq. Whether the mvcc decoding have an impact Stack?

Didn't see it show up here [~anoop.hbase] Not worried about where the CPU is spent at moment,
just about regression and then, being able to drive all the CPU. Can then come along after
and spend time on what the CPU is doing (Counters are our worst offender in this workload).

> 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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