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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4324) Single unassigned directory is very slow when there are many unassigned nodes
Date Tue, 28 Feb 2012 19:39:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218529#comment-13218529
] 

stack commented on HBASE-4324:
------------------------------

Yeah, should still be an issue.  Probably better to have it in 0.96, the singularity, since
will necessitate change in layout up in zk.
                
> 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: 0.90.4
>            Reporter: Todd Lipcon
>             Fix For: 0.96.0
>
>
> 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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