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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11740) RegionStates.getRegionAssignments() gets stuck on clone
Date Thu, 14 Aug 2014 17:46:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14097271#comment-14097271
] 

Andrew Purtell commented on HBASE-11740:
----------------------------------------

We need to rethink regionAssignments and regionsInTransition for the 1M+ region regime.

> RegionStates.getRegionAssignments() gets stuck on clone
> -------------------------------------------------------
>
>                 Key: HBASE-11740
>                 URL: https://issues.apache.org/jira/browse/HBASE-11740
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>            Reporter: Virag Kothari
>            Assignee: Virag Kothari
>         Attachments: HBASE-11740.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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