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From "Rahul Jain (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7822) Hadoop startup script has a race condition : this causes failures in datanodes status and stop commands
Date Tue, 15 Nov 2011 00:08:52 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rahul Jain updated HADOOP-7822:
-------------------------------

    Affects Version/s: 0.20.1
                       0.20.2
                       0.20.205.0

Our fix to get around the issues has been to add exclusion filter to 'rsync' under hadoop-daemon.sh
script:

Original:
  rsync -a -e ssh --delete --exclude=.svn --exclude='logs/*' --exclude='contrib/hod/logs/*'
$HADOOP_MASTER/ "$HADOOP_HOME"

Updated with fix:
 rsync -a -e ssh --delete --exclude='pids/*.pid' --exclude=.svn --exclude='logs/*' --exclude='contrib/hod/logs/*'
$HADOOP_MASTER/ "$HADOOP_HOME"

                
> Hadoop startup script has a race condition : this causes failures in datanodes status
and stop commands
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-7822
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7822
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.20.1, 0.20.2, 0.20.205.0
>            Reporter: Rahul Jain
>
> The symptoms are the following:
> a) start-all.sh is able to start both hadoop dfs and map-reduce processes, assuming same
grid nodes are used for dfs and map-reduce
> b) stop-all.sh stops map-reduce but fails to stop dfs processes (datanode tasks on grid
nodes)  
>     Instead, the warning message 'no datanode to stop' is seen for all data nodes.
> c) The 'pid' files for datanode processes do not exist therefore the only way to stop
datanode processes is to manually execute kill commands.
> The root cause of the issue appears to be in hadoop startup scripts. start-all.sh is
really two parts:
> 1. start-dfs.sh : Start namenode and datanodes
> 2. start-mapred.sh: Jobtracker and task trackers.
> In this case, running start-dfs.sh did as expected and created the pid files for different
datanodes. However, start-mapred.sh script did end up forcing another rsync from master to
slaves, effectively wiping out the pid files stored under "pid" directory.

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