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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Closed: (HADOOP-94) disallow more than one datanode running on one computing sharing the same data directory
Date Mon, 05 Jun 2006 23:08:33 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-94?page=all ]
     
Doug Cutting closed HADOOP-94:
------------------------------


> disallow more than one datanode running on one computing sharing the same data directory
> ----------------------------------------------------------------------------------------
>
>          Key: HADOOP-94
>          URL: http://issues.apache.org/jira/browse/HADOOP-94
>      Project: Hadoop
>         Type: Bug

>   Components: dfs
>     Versions: 0.2
>     Reporter: Hairong Kuang
>      Fix For: 0.3.0

>
> Currently dfs disallows more one datanode to run on the same computer if they are started
up using the same hadoop conf dir. However, this does not prevent more than one data node
gets started, each using a different conf dir (strickly speaking, a different pid file). If
every machine has two such datanodes running, namenode will be busy on deleting and replicating
blocks or eventually lead to block loss.
> Suggested solution: put pid file in  the data directory and disallow configuration.

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