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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-94) disallow more than one datanode running on one computing sharing the same data directory
Date Sat, 18 Mar 2006 01:26:19 GMT
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: 0.1    
    Reporter: Hairong Kuang


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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