Github user greghogan commented on a diff in the pull request: https://github.com/apache/flink/pull/2239#discussion_r70877433 --- Diff: flink-dist/src/main/flink-bin/bin/flink-daemon.sh --- @@ -77,31 +77,36 @@ if [[ ${JAVA_VERSION} =~ ${IS_NUMBER} ]]; then fi case $STARTSTOP in + (start|start-foreground) + # Rotate log files + rotateLogFile $log + rotateLogFile $out + + # Print a warning if daemons are already running on host + if [ -f $pid ]; then + active=() + while IFS='' read -r p || [[ -n "$p" ]]; do + kill -0 $p >/dev/null 2>&1 + if [ $? -eq 0 ]; then + active+=($p) + fi + done < "${pid}" - (start) - # Rotate log files - rotateLogFile $log - rotateLogFile $out - - # Print a warning if daemons are already running on host - if [ -f $pid ]; then - active=() - while IFS='' read -r p || [[ -n "$p" ]]; do - kill -0 $p >/dev/null 2>&1 - if [ $? -eq 0 ]; then - active+=($p) - fi - done < "${pid}" - - count="${#active[@]}" + count="${#active[@]}" - if [ ${count} -gt 0 ]; then - echo "[INFO] $count instance(s) of $DAEMON are already running on $HOSTNAME." - fi + if [ ${count} -gt 0 ]; then + echo "[INFO] $count instance(s) of $DAEMON are already running on $HOSTNAME." fi + fi + + if [[ $STARTSTOP == "start-foreground" ]]; then + echo "Starting $DAEMON as a foreground process on host $HOSTNAME." + $JAVA_RUN $JVM_ARGS ${FLINK_ENV_JAVA_OPTS} "${log_setting[@]}" -classpath "`manglePathList "$FLINK_TM_CLASSPATH:$INTERNAL_HADOOP_CLASSPATHS"`" ${CLASS_TO_RUN} "${ARGS[@]}" > "$out" 2>&1 < /dev/null + fi + if [[ $STARTSTOP == "start" ]]; then echo "Starting $DAEMON daemon on host $HOSTNAME." - $JAVA_RUN $JVM_ARGS ${FLINK_ENV_JAVA_OPTS} "${log_setting[@]}" -classpath "`manglePathList "$FLINK_TM_CLASSPATH:$INTERNAL_HADOOP_CLASSPATHS"`" ${CLASS_TO_RUN} "${ARGS[@]}" > "$out" 2>&1 < /dev/null & + nohup $JAVA_RUN $JVM_ARGS ${FLINK_ENV_JAVA_OPTS} "${log_setting[@]}" -classpath "`manglePathList "$FLINK_TM_CLASSPATH:$INTERNAL_HADOOP_CLASSPATHS"`" ${CLASS_TO_RUN} "${ARGS[@]}" > "$out" 2>&1 < /dev/null & --- End diff -- This is excellent documentation. It looks like (from a `grep daemon` through the code) that Flink is daemonizing its threads internally. Perhaps @StephanEwen can look at this.
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