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https://issues.apache.org/jira/browse/HBASE-11740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14097624#comment-14097624
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Virag Kothari commented on HBASE-11740:
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bq. Do we need to rethink regionAssignments and regionsInTransition for the 1M+
region regime?
The memory utilization is on higher side as all this structures are in memory.
But I haven't seen any other major problems.
> 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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