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Posted to issues@hbase.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2011/09/02 01:38:09 UTC
[jira] [Commented] (HBASE-4324) Single unassigned directory is very
slow when there are many unassigned nodes
[ https://issues.apache.org/jira/browse/HBASE-4324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095676#comment-13095676 ]
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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