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https://issues.apache.org/jira/browse/HBASE-4324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095676#comment-13095676
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Todd Lipcon commented on HBASE-4324:
------------------------------------
We may be able to get a nice boost by moving the watchAndGetNewChildren call
outside of the synchronization on regionsInTransition... need to think
carefully about that to see if it's correct.
> Single unassigned directory is very slow when there are many unassigned nodes
> -----------------------------------------------------------------------------
>
> Key: HBASE-4324
> URL: https://issues.apache.org/jira/browse/HBASE-4324
> Project: HBase
> Issue Type: Bug
> Components: zookeeper
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Fix For: 0.94.0
>
>
> Because we use a single znode for /unassigned, and we re-list it every time
> its contents change, assignment speed per region is O(number of unassigned
> regions) rather than O(1). Every time something changes about one unassigned
> region, the master has to re-list the entire contents of the directory inside
> of AssignmentManager.nodeChildrenChanged().
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