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Posted to yarn-dev@hadoop.apache.org by "Weiwei Yang (JIRA)" <ji...@apache.org> on 2016/11/28 16:46:58 UTC
[jira] [Created] (YARN-5937) stop-yarn.sh is not able to gracefully
stop node managers
Weiwei Yang created YARN-5937:
---------------------------------
Summary: stop-yarn.sh is not able to gracefully stop node managers
Key: YARN-5937
URL: https://issues.apache.org/jira/browse/YARN-5937
Project: Hadoop YARN
Issue Type: Bug
Reporter: Weiwei Yang
Assignee: Weiwei Yang
stop-yarn.sh always gives following output
{code}
./sbin/stop-yarn.sh
Stopping resourcemanager
Stopping nodemanagers
<NM_HOST>: WARNING: nodemanager did not stop gracefully after 5 seconds: Trying to kill with kill -9
oracle1.fyre.ibm.com: ERROR: Unable to kill 18097
{code}
this was because resource manager is stopped before node managers, when the shutdown hook manager tries to gracefully stop NM services, NM needs to unregister with RM, and it gets timeout as NM could not connect to RM (already stopped). See log (stop RM then run kill <nm_pid>)
{code}
16/11/28 08:26:43 ERROR nodemanager.NodeManager: RECEIVED SIGNAL 15: SIGTERM
...
16/11/28 08:26:53 WARN util.ShutdownHookManager: ShutdownHook 'CompositeServiceShutdownHook' timeout, java.util.concurrent.TimeoutException
java.util.concurrent.TimeoutException
at java.util.concurrent.FutureTask.get(FutureTask.java:205)
at org.apache.hadoop.util.ShutdownHookManager$1.run(ShutdownHookManager.java:67)
...
at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.unRegisterNM(NodeStatusUpdaterImpl.java:291)
...
16/11/28 08:27:13 ERROR util.ShutdownHookManager: ShutdownHookManger shutdown forcefully.
{code}
the shutdown hooker has a default of 10s timeout, so if RM is stopped before NMs, they always took more than 10s to stop (in java code). However stop-yarn.sh only gives 5s timeout, so NM is always killed instead of stopped.
It would make sense to stop NMs before RMs in this script, in a graceful way.
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