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From "Chunliang Lu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-9059) hadoop-daemons.sh script constraint that all the nodes should use the same installation path.
Date Sat, 17 Nov 2012 20:06:12 GMT
Chunliang Lu created HADOOP-9059:
------------------------------------

             Summary: hadoop-daemons.sh script constraint that all the nodes should use the
same installation path.
                 Key: HADOOP-9059
                 URL: https://issues.apache.org/jira/browse/HADOOP-9059
             Project: Hadoop Common
          Issue Type: Bug
          Components: bin
    Affects Versions: 1.0.4
         Environment: Linux
            Reporter: Chunliang Lu
            Priority: Critical


To run command on all slave hosts, the bin/hadoop-daemons.sh will call the bin/slaves.sh at
last line:
{code}
exec "$bin/slaves.sh" --config $HADOOP_CONF_DIR cd "$HADOOP_HOME" \; "$bin/hadoop-daemon.sh"
--config $HADOOP_CONF_DIR "$@"
{code}

where slaves.sh will call ssh and pass the `cd "$HADOOP_HOME" \; "$bin/hadoop-daemon.sh" --config
$HADOOP_CONF_DIR "$@"` part to the slaves. In bash, the $HADOOP_HOME $bin, and $HADOOP_CONF_DIR
will be replaced as current settings on the master, which means that this constraints that
all the slave nodes need to share the same path setting as master node. This is not reasonable.
In my setting, the cluster has a shared NFS, and I would like to use different configuration
files for different machines. I know this is not a recommended way to manage clusters, but
I just have no choice. I think other people may face the same problem. How about replace it
like following and allow different configuration for master and slaves?

{code}
cd "$HADOOP_HOME" \; "$bin/hadoop-daemon.sh" --config $HADOOP_CONF_DIR "$@"
{code}

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