[jira] [Created] (AMQ-8364) ActiveMQ runs at different PID when using console version

["Petr Újezdský (Jira)" <ji...@apache.org>]

Petr Újezdský created AMQ-8364:
----------------------------------

             Summary: ActiveMQ runs at different PID when using console version
                 Key: AMQ-8364
                 URL: https://issues.apache.org/jira/browse/AMQ-8364
             Project: ActiveMQ
          Issue Type: Bug
    Affects Versions: 5.15.10
            Reporter: Petr Újezdský


When using {{/opt/activemq/bin/activemq console}} the jar invocation is done using {{exec}}. However this is not done properly, the {{java}} process itself still has different PID than the main process.

This is problem inside docker environment where the app should run with PID 1 to properly listen to {{KILL}} signal to stop gracefully. I have filed a bug downstream in docker version https://github.com/rmohr/docker-activemq/issues/34#issuecomment-907159964 but found out the problem is in ActiveMQ itself.

When run using {{console}} parameter, the code goes
{code}
case "$1" in
  ...
  console)
    invoke_console
    exit $?
    ;;
{code}

{code}
invoke_console(){
    ...
    EXEC_OPTION="exec"
    ...
    invokeJar "$ACTIVEMQ_PIDFILE"
    ...
}
{code}

{code}
invokeJar(){
   ...
   else
      $EXEC_OPTION $DOIT_PREFIX "\"$JAVACMD\" $ACTIVEMQ_OPTS $ACTIVEMQ_DEBUG_OPTS \
              -Dactivemq.classpath=\"${ACTIVEMQ_CLASSPATH}\" \
              -Dactivemq.home=\"${ACTIVEMQ_HOME}\" \
              -Dactivemq.base=\"${ACTIVEMQ_BASE}\" \
              -Dactivemq.conf=\"${ACTIVEMQ_CONF}\" \
              -Dactivemq.data=\"${ACTIVEMQ_DATA}\" \
              $ACTIVEMQ_CYGWIN \
              -jar \"${ACTIVEMQ_HOME}/bin/activemq.jar\" $COMMANDLINE_ARGS" $DOIT_POSTFIX
      RET="$?"
   fi
   ...
{code}

The problem is here
{code}
$EXEC_OPTION $DOIT_PREFIX "\"$JAVACMD\"
{code}

This translates into something like
{code}
exec sh -c 'java some.jar args'
{code}

and the PIDs are as follows (note the wrong PID 23 for java itself)
{code}
activemq@a9d909468041:/opt/apache-activemq-5.15.10$ ps axu
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
activemq     1  0.0  0.0   4296   708 ?        Ss   12:05   0:00 sh -c "/opt/java/bin/java" -Xms64M -Xm
activemq    23 29.3  1.5 5481824 251840 ?      Sl   12:05   0:12 /opt/java/bin/java -Xms64M -Xmx1G -Dja
activemq   108  0.1  0.0  18144  3172 pts/0    Ss   12:06   0:00 /bin/bash
activemq   164  0.0  0.0  36644  2832 pts/0    R+   12:06   0:00 ps axu
{code}


IMHO the code should be something like
{code}
$EXEC_OPTION $DOIT_PREFIX "$EXEC_OPTION \"$JAVACMD\"
{code}

that translates into something like
{code}
exec sh -c 'exec java some.jar args'
{code}

and the PIDs will be correct
{code}
activemq@a9d909468041:/opt/apache-activemq-5.15.10$ ps axu
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
activemq     1  161  1.6 5282132 275824 ?      Ssl  12:08   0:11 /opt/java/bin/java -Xms64M -Xmx1G -Dja
activemq    61  0.5  0.0  18144  3220 pts/0    Ss   12:08   0:00 /bin/bash
activemq    82  0.0  0.0  36644  2788 pts/0    R+   12:08   0:00 ps axu
{code}



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