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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1747) [hbase] On a cluster, on restart, regions multiply assigned
Date Tue, 21 Aug 2007 22:08:39 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HADOOP-1747:
--------------------------

    Attachment: hadoop-1747.patch

Here's a fix.  Commit message to use is below.

HADOOP-1747 On a cluster, on restart, regions multiply assigned

M src/contrib/hbase/src/java/org/apache/hadoop/hbase/HMaster.java
    Removed some empty lines so I can squeeze more code into a screenful.
    (assignedRegions): Factored out some code into own methods so
    this method is made a bit shorter.  Added early returns near
    top -- if nothing to assign, etc. -- so less nesting.
    Added fix: Instead of iterating over unassignedRegions after
    all the loadings have been calculated, instead iterate over
    the locally calculated  map, regionsToAssign (Otherwise, we 
    were running over the same territory each time through the
    loop and were thus giving out same region multiple times).
    (regionsPerServer, assignRegionsToOneServer,
      getRegionsToAssign): Added.

> [hbase] On a cluster, on restart, regions multiply assigned
> -----------------------------------------------------------
>
>                 Key: HADOOP-1747
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1747
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>            Reporter: stack
>            Assignee: stack
>            Priority: Minor
>             Fix For: 0.15.0
>
>         Attachments: hadoop-1747.patch
>
>
> In a cluster of multiple region servers, on restart, regions are being assigned multiple
times often to different servers.

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