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https://issues.apache.org/jira/browse/HBASE-16679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15521008#comment-15521008
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Yu Li commented on HBASE-16679:
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Just noticed this one, nice catch and thanks for the patch [~appy]
> Flush throughput controller: Minor perf change and fix flaky
> TestFlushWithThroughputController
> ----------------------------------------------------------------------------------------------
>
> Key: HBASE-16679
> URL: https://issues.apache.org/jira/browse/HBASE-16679
> Project: HBase
> Issue Type: Bug
> Reporter: Appy
> Assignee: Appy
> Fix For: 2.0.0, 1.3.0, 1.4.0
>
> Attachments: HBASE-16679.master.001.patch,
> HBASE-16679.master.002.patch, HBASE-16679.master.003.patch
>
>
> Minor perf change:
> Calculate maxThroughputPerOperation outside of control() since start()&end()
> are called only once per operation, but control can be called
> hundreds/thousands of time.
> Flaky test:
> Problems in current test:
> - writes only 2.5MB each iteration but control triggers sleep only every 1Mb
> write (decided by HBASE_HSTORE_FLUSH_THROUGHPUT_CONTROL_CHECK_INTERVAL).
> Either increase data written in each batch or decreasing this threshold for
> better throughput control.
> - We shouldn't be timing table disable/delete/create and populating data in
> throughput calculations.
> See the differences below.
> With patch (total data written 30M)
> run 1:
> Throughput is: 1.0113841089709052 MB/s
> Throughput w/o limit is: 14.665069580078125 MB/s
> With 1M/s limit, flush use 29683ms; without limit, flush use 2130ms
> run 2:
> Throughput is: 1.0113841089709052 MB/s
> Throughput w/o limit is: 14.665069580078125 MB/s
> With 1M/s limit, flush use 29674ms; without limit, flush use 2027ms
> Without patch (total data written 25M)
> run 1:
> Throughput is: 0.921681903523776 MB/s
> Throughput w/o limit is: 4.06833346870301 MB/s
> With 1M/s limit, flush use 27189ms; without limit, flush use 6159ms
> run 2:
> Throughput is: 0.9422982728478803 MB/s
> Throughput w/o limit is: 4.047858424942981 MB/s
> With 1M/s limit, flush use 26594ms; without limit, flush use 6190ms
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