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  1. Hadoop Common
  2. HADOOP-8222

bin/hadoop should allow callers to set jsvc pidfile even when not-detached

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Not A Problem
    • Affects Version/s: 0.20.205.0, 0.23.1
    • Fix Version/s: None
    • Component/s: scripts
    • Labels:
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      Description

      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

      1. Even though we are trying to run a non-detached datanode,
      2. jsvc will not write to stdout/stderr, so we have to pipe
      3. 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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              • Assignee:
                Unassigned
                Reporter:
                plinnell Peter Linnell
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                • Created:
                  Updated:
                  Resolved: