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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4324) Single unassigned directory is very slow when there are many unassigned nodes
Date Fri, 02 Sep 2011 00:16:09 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4324?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HBASE-4324:
-------------------------------

    Affects Version/s:     (was: 0.92.0)
                       0.90.4
        Fix Version/s:     (was: 0.94.0)
                       0.92.0

This may have been fixed by HBASE-3789, now that I look closely at trunk vs 90.

> 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: 0.92.0
>
>
> 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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