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Posted to issues@hbase.apache.org by "Jimmy Xiang (JIRA)" <ji...@apache.org> on 2014/08/15 19:29:20 UTC
[jira] [Assigned] (HBASE-11740) RegionStates.getRegionAssignments()
gets stuck on clone
[ https://issues.apache.org/jira/browse/HBASE-11740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jimmy Xiang reassigned HBASE-11740:
-----------------------------------
Assignee: Jimmy Xiang (was: Virag Kothari)
> 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: Jimmy Xiang
> 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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