[jira] [Created] (MESOS-9786) Race between two REMOVE_QUOTA calls crashes the master.

[Andrei Sekretenko (JIRA)]

Andrei Sekretenko created MESOS-9786:
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             Summary: Race between two REMOVE_QUOTA calls crashes the master.
                 Key: MESOS-9786
                 URL: https://issues.apache.org/jira/browse/MESOS-9786
             Project: Mesos
          Issue Type: Bug
    Affects Versions: 1.8.0, 1.5.1, 1.8.1
            Reporter: Andrei Sekretenko


The existence of the quota in the master is validated here:
[https://github.com/apache/mesos/blob/a9a2acabd03181865055b77cf81e7bb310b236d6/src/master/quota_handler.cpp#L700]

Then the quota is removed from master in a deferred method call:
[https://github.com/apache/mesos/blob/a9a2acabd03181865055b77cf81e7bb310b236d6/src/master/quota_handler.cpp#L744]

And then removed from allocator in another deferred call:
[https://github.com/apache/mesos/blob/a9a2acabd03181865055b77cf81e7bb310b236d6/src/master/quota_handler.cpp#L753]

So, there is a race between two simultaneous REMOVE_QUOTA calls.

We observe this race on a heavily loaded cluster. Currently we suspect that the 
client retries the call (due to the call being not processed for a long time),  
and this triggers the race.



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