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From "Abhilash (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HBASE-13980) Distinguish blockedFlushCount vs unblockedFlushCount when tuning heap memory
Date Sat, 27 Jun 2015 02:43:04 GMT

     [ https://issues.apache.org/jira/browse/HBASE-13980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Abhilash reassigned HBASE-13980:
--------------------------------

    Assignee: Abhilash

> Distinguish blockedFlushCount vs unblockedFlushCount when tuning heap memory
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-13980
>                 URL: https://issues.apache.org/jira/browse/HBASE-13980
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: Abhilash
>            Priority: Minor
>
> Currently DefaultHeapMemoryTuner doesn't distinguish blockedFlushCount vs unblockedFlushCount.
> In its tune() method:
> {code}
>     long totalFlushCount = blockedFlushCount+unblockedFlushCount;
>     rollingStatsForCacheMisses.insertDataValue(cacheMissCount);
>     rollingStatsForFlushes.insertDataValue(totalFlushCount);
> {code}
> Occurrence of blocked flush indicates that upper limit for memstore is not sufficient.
> We should either give blockedFlushCount more weight or, take tuning action based on blockedFlushCount
directly.
> See discussion from tail of HBASE-13876.



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