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(Updated July 9, 2015, 6:49 p.m.)

Review request for mesos, Ben Mahler, Isabel Jimenez, Marco Massenzio, and 
Vinod Kone.


Addressed review comments + added a fix to close the pipe upon exit. Would add 
a test-case for it in a separate review when submitting the 
re-registration(...) change thereby testing for failover etc.

Bugs: MESOS-2294

Repository: mesos


This change lays the ground-work for the master's ability to stream events back 
to the client. This review turned out a bit too large for my own liking but in 
a nutshell, it just takes a subscribe request and puts a subscribed event back 
on the stream.

Explanation of changes:
- Made a generic FrameworkDriver interface that the master now uses to 
communicate with the frameworks instead of just invoking 
- Framework's can be of 2 types now http, libprocess.
- Made a adapter class that takes the messages from master, transforms them to 
events that the http framework driver can then understand.
- This still uses hard-coded http related constants. They can go away when 
Isabel submits her validation change (36217)
- This change prefers use of using trailing under-scores as member variables 
from the style guide.

Diffs (updated)

  src/common/protobuf_utils.hpp afe5a85d3f58eaabb16807253c5fcc07cabcf8e8 
  src/common/protobuf_utils.cpp 8a51daa45db312ca4608dda3fd99df2c3f9962f1 
  src/master/http.cpp 23a6d4bd2f60cb4a4ad463aea7cc032941578bdc 
  src/master/master.hpp 2343a684402972a8c336c0dcdde0bfaffabe7cec 
  src/master/master.cpp 35e147574842e3c6ae819541a6c03bf16a375294 
  src/tests/http_api_tests.cpp 64bbeb6699171e85a5be293919ad9f32ded0ebac 

Diff: https://reviews.apache.org/r/36318/diff/


make check + a simple test for subscribe call received a subscribed event back 
on the stream.


Anand Mazumdar

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