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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