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https://issues.apache.org/jira/browse/HBASE-15971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15319474#comment-15319474
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stack commented on HBASE-15971:
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I am having trouble finding where the regression came in looking at diff
between 0.98 and 1.0. I've hacked in a good bit of the 0.98 RPC but still 1.0
is slow so it is elsewhere (looking at hbase-default.xml changes, nothing
apparent). It does not seem to be changes in RpcExecutor or in the derivative
RWQ. This one is hard to bisect since needs to run on cluster and get
eyeballed.... let me keep trying.
> 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, 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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