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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 06:25:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15042699#comment-15042699
] 

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

FAILURE: Integrated in HBase-Trunk_matrix #533 (See [https://builds.apache.org/job/HBase-Trunk_matrix/533/])
HBASE-14922 Delayed flush doesn't work causing flush storms. (eclark: rev cd5ddc5fece7147d55d74117abb272cf8ea08c4d)
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
* hbase-common/src/test/java/org/apache/hadoop/hbase/TestChoreService.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/JitterScheduledThreadPoolExecutorImpl.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/ChoreService.java
HBASE-14922 Delayed flush doesn't work causing flush storms. -- ADD (eclark: rev 46198bb9a4f9c78bbf3ccb84f6ae835564ecdc7f)
* 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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