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From: "John Leach (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-13420)
 RegionEnvironment.offerExecutionLatency Blocks Threads under Heavy Load
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    [ https://issues.apache.org/jira/browse/HBASE-13420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485539#comment-14485539 ] 

John Leach commented on HBASE-13420:
------------------------------------

Andrew,

Will do for the short term.  Clearly, if we want to display metrics for coprocessors they should display all coprocs and have a scalable meter impl for them we clear understanding of what "execution time" means.

John

> 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
>         Attachments: HBASE-13420.patch, HBASE-13420.txt, 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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