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From "Bernd Mathiske" <>
Subject Re: Review Request 23912: Fix MESOS-947: Slave should properly handle a killTask() that arrives between runTask() and _runTask()
Date Wed, 06 Aug 2014 23:51:05 GMT

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(Updated Aug. 6, 2014, 4:51 p.m.)

Review request for mesos.


Put in patch dependency instead of added patch file.

Added comments that were missing from last attempt to publish review response due to review
tool pilot error (Sorry!).

Bugs: MESOS-947

Repository: mesos-git


Fixes MESOS-947 "Slave should properly handle a killTask() that arrives between runTask()
and _runTask()".

Slave::killTask() did not check for task in question combination to be "pending" (i.e. Slave::runTask
had happened, but Slave::_runTask had not yet) and then erroneously assumed that Slave::runTask()
had not been executed. The task was then marked "LOST" instead of "KILLED". But Slave::runTask
had already scheduled Slave::_runTask to follow. Now the entry for being "pending" is removed,
and the task is marked "KILLED", and _runTask gets informed about this. It checks whether
the task in question is currently "pending" and if it is not, then it infers that the task
has been killed and does not erroneously try to complete launching it.


  src/slave/slave.hpp a896bb66db5d8cd27ef02b6498c9db93cb0d525f 
  src/slave/slave.cpp 1d5691836822c8587e1aa8ed24860a8012c67a6e 
  src/tests/mesos.hpp 75c66fda2485afa0d4541e710780d90b3411839a 
  src/tests/mesos.cpp 35c94fa908ad728ea92a7d1bfcbe90d57b1b83d9 
  src/tests/slave_tests.cpp e45255a6f699e51bf09397da95a5a11edbabe591 



Wrote a unit test that reliably created the situation described in the ticket. Observed that
TASK_LOST and the listed log output occurred. This pointed directly to the lines in killTask()
where the problem is rooted. Ran the test after fixing, it succeeded. Checked the log. It
looks like a "clean kill" now :-)


Bernd Mathiske

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