[jira] [Comment Edited] (HBASE-11740) RegionStates.getRegionAssignments() gets stuck on clone

["Jimmy Xiang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-11740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14097191#comment-14097191 ] 

Jimmy Xiang edited comment on HBASE-11740 at 8/14/14 4:46 PM:
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If the original is changed, will the unmodifiable Map get some exception if it is in the middle of iteration?


was (Author: jxiang):
It the original is changed, will the unmodifiable Map get some exception if it is in the middle of iteration?

> 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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