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From "Nikhil Mulley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-1954) start task tracker and stop task tracker scripts
Date Sat, 05 May 2012 18:29:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269030#comment-13269030

Nikhil Mulley commented on HADOOP-1954:

My approach to this would be to have a script which knows what are the current task trackers
online and connected currently to the JobTracker, should be issued an RPC command, to get
restarted. That ways, I can restart all my tasktrackers in my cluster restarted from a single
host/place(i.e.,. where the jobtracker is running upon).

Here is the thing, I would propose:
have another script named 'mapred-cluster.sh' with the following options.

   mapred-cluster.sh [jobtracker|tasktracker] [options]

        jobtracker   start|stop|restart     # this would restart only the jobtracker component
of the cluster
        tasktracker  [-h comma seperated hostnames|ipaddress|all] start|stop|restart     #
this should based on the argument value provided by -h option, should initiate the action
as noted by start|stop|restart. If -h option is not provided, assume it is the localhost.
If 'all' is provided as an argument value to the option -h, then it should initiate a (batch?)
restart of all the tasktrackers connected to the jobtracker.

Let me know how does it sound to guys. Anyone willing to code a patch/hookup a jar for this?

> start task tracker and stop task tracker scripts
> ------------------------------------------------
>                 Key: HADOOP-1954
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1954
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: scripts
>            Reporter: Kate Rhodes
>            Priority: Trivial
>         Attachments: start_stop_tt_scripts.patch
> we should have scripts for starting and stopping just the task tracker

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