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From "Anand Mazumdar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MESOS-5380) Killing a queued task can cause the corresponding command executor to never terminate.
Date Fri, 13 May 2016 19:40:13 GMT

     [ https://issues.apache.org/jira/browse/MESOS-5380?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anand Mazumdar updated MESOS-5380:
----------------------------------
    Summary: Killing a queued task can cause the corresponding command executor to never terminate.
 (was: Killing a queued task can cause the corresponding command executor never terminates.)

> Killing a queued task can cause the corresponding command executor to never terminate.
> --------------------------------------------------------------------------------------
>
>                 Key: MESOS-5380
>                 URL: https://issues.apache.org/jira/browse/MESOS-5380
>             Project: Mesos
>          Issue Type: Bug
>    Affects Versions: 0.28.0, 0.28.1
>            Reporter: Jie Yu
>            Assignee: Vinod Kone
>            Priority: Blocker
>             Fix For: 0.29.0, 0.28.2
>
>
> We observed that in our testing environment. So here is the sequence of events:
> 1) A command task is queued, the executor is not registered yet
> 2) The framework issues a killTask
> 3) Since executor is in REGISTERING state, agent calls `statusUpdate(TASK_KILLED, UPID())`
> 4) `statusUpdate` now will call `containerizer->status()` before calling `executor->terminateTask(status.task_id(),
status);` which will remove the queued task. (introduced in this patch https://reviews.apache.org/r/43258).
> 5) Since the above is async, it's possible that the task is still in queued task when
we trying to see if we need to kill unregistered executor in `killTask`:
> {code}
>       // TODO(jieyu): Here, we kill the executor if it no longer has
>       // any task to run and has not yet registered. This is a
>       // workaround for those single task executors that do not have a
>       // proper self terminating logic when they haven't received the
>       // task within a timeout.
>       if (executor->queuedTasks.empty()) {
>         CHECK(executor->launchedTasks.empty())
>             << " Unregistered executor '" << executor->id
>             << "' has launched tasks";
>         LOG(WARNING) << "Killing the unregistered executor " << *executor
>                      << " because it has no tasks";
>         executor->state = Executor::TERMINATING;
>         containerizer->destroy(executor->containerId);
>       }    
> {code}
> 6) The executor will never be terminated by Mesos after that.



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