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From "John Leach (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HBASE-13420) RegionEnvironment.offerExecutionLatency Blocks Threads under Heavy Load
Date Tue, 07 Apr 2015 20:53:12 GMT

     [ https://issues.apache.org/jira/browse/HBASE-13420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

John Leach reassigned HBASE-13420:
----------------------------------

    Assignee: John Leach

> 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: John Leach
>         Attachments: 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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