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From "Peter Linnell (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8222) bin/hadoop should allow callers to set jsvc pidfile even when not-detached
Date Thu, 29 Mar 2012 01:39:28 GMT
bin/hadoop should allow callers to set jsvc pidfile even when not-detached
--------------------------------------------------------------------------

                 Key: HADOOP-8222
                 URL: https://issues.apache.org/jira/browse/HADOOP-8222
             Project: Hadoop Common
          Issue Type: Improvement
          Components: scripts
    Affects Versions: 0.23.1, 0.20.205.0
            Reporter: Peter Linnell


it would be nice if the jsvc pid file were properly namespaced in /var/run to avoid collisions
with other jsvc instances

jsvc uses /var/run/jsvc.pid for the datanode pid file. If that's configurable, it should be
configured: /var/run/jsvc.pid is sorely not namespaced.

if [ "$_HADOOP_DAEMON_DETACHED" = "true" ]; then
      _JSVC_FLAGS="-pidfile $_HADOOP_DAEMON_PIDFILE
                  -errfile &1
                  -outfile $_HADOOP_DAEMON_OUT"
    else
      # Even though we are trying to run a non-detached datanode,
      # jsvc will not write to stdout/stderr, so we have to pipe
      # it and tail the logfile.
      log_path=/tmp/jsvc_${COMMAND}.$$
      _JSVC_FLAGS="-nodetach
                   -errfile &1
                   -outfile $log_path"
      echo Non-detached jsvc output piping to: $log_path
      touch $log_path
      tail -f $log_path &
    fi

And the relevant argument is '-pidfile' (http://linux.die.net/man/1/jsvc).


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