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Review request for mesos and Greg Mann.


Bugs: MESOS-9609
    https://issues.apache.org/jira/browse/MESOS-9609


Repository: mesos


Description
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Per MESOS-9609, it's possible for the master to encounter a CHECK
failure during agent removal in the following situation:

  1. Given a framework with checkpoint == false, with only
     executor(s) (no tasks) running on an agent:
  2. When this agent disconects from the master,
     Master::removeFramework(Slave*, Framework*) removes the
     tasks and executors. However, when there are no tasks, this
     function will accidentally insert an entry into
     Master::Slave::tasks! (Due to the [] operator usage)
  3. Now if the framework is removed, we have an entry in
     Slave::tasks, for which there is no corresponding framework.
  4. When the agent is removed, we have a CHECK failure given
     we can't find the framework.

This fixes the issue by avoiding the accidental insertion.


Diffs
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  src/master/master.cpp 02723296e569fac9d553b1494a5ca7daa6ef9aa4 


Diff: https://reviews.apache.org/r/72831/diff/1/


Testing
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See subsequent patch.


Thanks,

Benjamin Mahler