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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 Fri, 10 Jun 2016 00:45:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15323661#comment-15323661
] 

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

Here is a hack copying a trick from Kudu that [~tlipcon] pointed me at. Needs work (hack is
in the 'wrong' place). Gets us almost 2x. Will work on a better version...

Now to go find why big diff between 0.98 and 1.0.

> 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, branch-1.hits.png,
branch-1.png
>
>
> 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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