Roman Shaposhnik created HADOOP-8353: ----------------------------------------
Summary: hadoop-daemon.sh and yarn-daemon.sh can be misleading on stop Key: HADOOP-8353 URL: https://issues.apache.org/jira/browse/HADOOP-8353 Project: Hadoop Common Issue Type: Improvement Components: scripts Affects Versions: 0.23.1 Reporter: Roman Shaposhnik Assignee: Roman Shaposhnik Fix For: 2.0.0 The way that stop actions is implemented is a simple SIGTERM sent to the JVM. There's a time delay between when the action is called and when the process actually exists. This can be misleading to the callers of the *-daemon.sh scripts since they expect stop action to return when process is actually stopped. I suggest we augment the stop action with a time-delay check for the process status and a SIGKILL once the delay has expired. I understand that sending SIGKILL is a measure of last resort and is generally frowned upon among init.d script writers, but the excuse we have for Hadoop is that it is engineered to be a fault tolerant system and thus there's not danger of putting system into an incontinent state by a violent SIGKILL. Of course, the time delay will be long enough to make SIGKILL event a rare condition. Finally, there's always an option of an exponential back-off type of solution if we decide that SIGKILL timeout is short. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira