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From "Lars Hofhansl (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4324) Single unassigned directory is very slow when there are many unassigned nodes
Date Tue, 28 Feb 2012 06:51:48 GMT

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

Lars Hofhansl updated HBASE-4324:
---------------------------------

    Fix Version/s:     (was: 0.92.2)
                       (was: 0.94.0)
                   0.96.0

Is this still an issue? Moving out of 0.94 for now.
                
> 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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