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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14922) Delayed flush doesn't work causing flush storms.
Date Sat, 05 Dec 2015 06:35:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15042704#comment-15042704
] 

Hudson commented on HBASE-14922:
--------------------------------

FAILURE: Integrated in HBase-1.2 #424 (See [https://builds.apache.org/job/HBase-1.2/424/])
HBASE-14922 Delayed flush doesn't work causing flush storms. (eclark: rev c4b0e2e36215c9572179c0addfe841862fe3727c)
* hbase-common/src/test/java/org/apache/hadoop/hbase/TestChoreService.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/ChoreService.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/JitterScheduledThreadPoolExecutorImpl.java
HBASE-14922 Delayed flush doesn't work causing flush storms. -- ADD (eclark: rev 39d7ce66c5a58014563c26fab2f29c6c8953a898)
* hbase-common/src/main/java/org/apache/hadoop/hbase/JitterScheduledThreadPoolExecutorImpl.java


> 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: 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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