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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11740) RegionStates.getRegionAssignments() gets stuck on clone
Date Fri, 15 Aug 2014 23:48:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14099358#comment-14099358
] 

Hudson commented on HBASE-11740:
--------------------------------

SUCCESS: Integrated in HBase-0.98-on-Hadoop-1.1 #426 (See [https://builds.apache.org/job/HBase-0.98-on-Hadoop-1.1/426/])
HBASE-11740 RegionStates.getRegionAssignments() gets stuck on clone (Virag Kothari) (jxiang:
rev 78397a539e0305d99a0b9b169f83ae9784918440)
* hbase-server/src/main/java/org/apache/hadoop/hbase/master/RegionStates.java


> RegionStates.getRegionAssignments() gets stuck on clone
> -------------------------------------------------------
>
>                 Key: HBASE-11740
>                 URL: https://issues.apache.org/jira/browse/HBASE-11740
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Region Assignment
>            Reporter: Virag Kothari
>            Assignee: Virag Kothari
>             Fix For: 0.99.0, 2.0.0, 0.98.6
>
>         Attachments: HBASE-11740.patch, HBASE-11740_2.patch
>
>
> This happens in processDeadServersAndRegionsInTransition() on Master startup. RegionAssigments
is a tree map and TreeMap.clone() is expensive as it builds a tree from sorted data (Order
of n). There were a million entries in RegionAssigments and from jstack, thread was stuck
in TreeMap.buildFromSorted() for couple of hours.
> Instead of this shadow clone, wrapping as an unmodifiable Map should be enough.



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