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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13420) RegionEnvironment.offerExecutionLatency Blocks Threads under Heavy Load
Date Wed, 22 Apr 2015 17:48:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14507537#comment-14507537
] 

Lars Hofhansl commented on HBASE-13420:
---------------------------------------

Seems not worth it to me, unless [~jleach4] has a more specific use case where we'd see a
larger difference.

> RegionEnvironment.offerExecutionLatency Blocks Threads under Heavy Load
> -----------------------------------------------------------------------
>
>                 Key: HBASE-13420
>                 URL: https://issues.apache.org/jira/browse/HBASE-13420
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: John Leach
>            Assignee: Andrew Purtell
>             Fix For: 2.0.0, 1.1.0, 0.98.13, 1.0.2
>
>         Attachments: 1M-0.98.12.svg, 1M-0.98.13-SNAPSHOT.svg, HBASE-13420.patch, HBASE-13420.txt,
hbase-13420.tar.gz, offerExecutionLatency.tiff
>
>   Original Estimate: 3h
>  Remaining Estimate: 3h
>
> The ArrayBlockingQueue blocks threads for 20s during a performance run focusing on creating
numerous small scans.  
> I see a buffer size of (100)
>     private final BlockingQueue<Long> coprocessorTimeNanos = new ArrayBlockingQueue<Long>(
>         LATENCY_BUFFER_SIZE);
> and then I see a drain coming from
>          MetricsRegionWrapperImpl with 45 second executor
>          HRegionMetricsWrapperRunable
>          RegionCoprocessorHost#getCoprocessorExecutionStatistics()   
>          RegionCoprocessorHost#getExecutionLatenciesNanos()
> Am I missing something?



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