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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14922) Delayed flush doesn't work causing flush storms.
Date Sun, 06 Dec 2015 21:53:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15044170#comment-15044170
] 

Elliott Clark commented on HBASE-14922:
---------------------------------------


Thanks for the fix [~lhofhansl] and for the fast commit [~stack]

How did all of the QA bots succeed when this seems to be so reproducible ?


> Delayed flush doesn't work causing flush storms.
> ------------------------------------------------
>
>                 Key: HBASE-14922
>                 URL: https://issues.apache.org/jira/browse/HBASE-14922
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 2.0.0, 1.2.0, 1.1.2
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>             Fix For: 2.0.0, 1.2.0, 1.3.0
>
>         Attachments: 14922-fix.txt, HBASE-14922-v1.patch, HBASE-14922-v2.patch, HBASE-14922.patch
>
>
> Starting all regionservers at the same time will mean that most PeriodicMemstoreFlusher's
will be running at the same time. So all of these threads will queue flushes at about the
same time.
> This was supposed to be mitigated by Delayed. However that isn't nearly enough. This
results in the immediate filling up and then draining of the flush queues every hour.



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