FAQ
bin/hadoop should allow callers to set jsvc pidfile even when not-detached
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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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postedMar 29, '12 at 1:39a
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