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https://reviews.apache.org/r/43661/
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Review request for mesos and Vinod Kone.


Bugs: MESOS-3570
    https://issues.apache.org/jira/browse/MESOS-3570


Repository: mesos


Description
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This change adds a check to ensure that we don't `Subscribe` again in case we 
already have a `SubscribedResponse` stream set. With pipelining, we won't be 
able to send more then 1 subscribe calls on the `Subscribe` connection.

In case, the scheduler sends two subscribe calls simultaneously before the 
subscribed response stream could be established. We would invoke the 
`disconnected`/`connected` callback, making the scheduler subscribe again.


Diffs
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  src/scheduler/scheduler.cpp 99a7d0dfff7b0c61decc9ff6d9e6d46ef13a7e75 

Diff: https://reviews.apache.org/r/43661/diff/


Testing
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make check


Thanks,

Anand Mazumdar

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