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From Neil Conway <>
Subject Re: Review Request 50705: Changed master to allow partitioned slaves to reregister.
Date Sat, 13 Aug 2016 23:56:03 GMT

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(Updated Aug. 13, 2016, 11:56 p.m.)

Review request for mesos and Vinod Kone.


Minor fixes.

Bugs: MESOS-4049

Repository: mesos


The previous behavior was to shutdown partitioned agents that attempt to
reregister---unless the master has failed over, in which case the
reregistration is allowed (when running in "non-strict" mode).

The new behavior is always to allow partitioned agents to reregister.
This is part of a longer-term project to allow frameworks to define
their own policies for handling tasks running on partitioned agents.

In particular, if a framework has the PARTITION_AWARE capability, any
tasks running on the partitioned agent will continue to run after
reregistration. If the framework is not PARTITION_AWARE, any tasks that
were running on such an agent will be killed after the agent reregisters
(unless the master has failed over). This is for backward compatibility
with the previous ("non-strict") behavior. Note that regardless of the
PARTITION_AWARE capability, the agent will not be shutdown, which is a
change from the previous Mesos behavior.

This commit also changes the master so that if an agent is removed and
then the master receives a message from that agent, the master will no
longer attempt to shutdown the agent. This is consistent with the goal
of getting the master out of the business of shutting down agents that
we suspect are unhealthy. Such an agent will eventually realize it is
not registered with the master (e.g., because it won't receive any pings
from the master), which will cause it to reregister.

Diffs (updated)

  src/master/master.hpp 6decff6f4b9c3434de030fd5c06df4c683a7abad 
  src/master/master.cpp 0bd1a3490a86fede86a3f5f62ce4745b65aae258 
  src/tests/master_tests.cpp 398164d09b8ef14f916122ed8780023c4a3cd0f6 
  src/tests/partition_tests.cpp 0a72b345538ca3b9510fccf38ceb68ac71c2b473 



make check


Neil Conway

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