[ http://issues.apache.org/jira/browse/HADOOP-94?page=all ]
eric baldeschwieler resolved HADOOP-94:
---------------------------------------
Resolution: Duplicate
> 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
>
> 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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