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From "Julia (JIRA)" <j...@apache.org>
Subject [jira] [Created] (REEF-1725) IMRU Job fails when UpdateTask is done but another evaluator fails at the same time causing system state change to ShutDown
Date Wed, 25 Jan 2017 21:41:26 GMT
Julia created REEF-1725:
---------------------------

             Summary: IMRU Job fails when UpdateTask is done but another evaluator fails at
the same time causing system state change to ShutDown
                 Key: REEF-1725
                 URL: https://issues.apache.org/jira/browse/REEF-1725
             Project: REEF
          Issue Type: Bug
            Reporter: Julia
            Priority: Critical


Currently in IMRU fault tolerant system, when the master task is done, at the same time the
task receives Close event caused by some other evaluator failures, the system state is changed
to ShutDown, causing retry again. 

In fact, as soon as master is done, this event should be clearly passed to driver and the
driver should execute DoneAction no matter if there is any other failures happen at the same
time. 

There are multiple possible solutions:
1.	Let CompletedTask to carry “done” information – The major issue for this solution
is not just the complexity of updating proto buffer message and both Java and C# code, the
issue is task needs to have a way to let TaskRuntime know it is “done”. For that, we need
to change ITask interface which is something we should be careful not to change unless it
is really necessary. 
2.	Use task massage – this is simple to implement. However task message is sent with heartbeat
for “running task”. If the task status is changed to close before the heartbeat is sent,
this message won’t be sent out to driver. 
3.	Send different events for Update task COMPLETE and CLOSE. Currently no matter update task
is really done or close by driver, ITask.Call() is returned and ICompletedTask is sent. If
we only send ICompletedTask when the task is really done no matter what other things happen,
and send IFailedTask if the Update task is closed by driver and the task is not “done”,
then driver will be able to differentiate those two events.  This is an easier and quicker
solution. 







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