Review Request 25663: MESOS-1392: MasterDetector now returns a None when it cannot read the content of the ZNode it has detected.

[Jiang Yan Xu]

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Review request for mesos and Ben Mahler.


Bugs: MESOS-1392
    https://issues.apache.org/jira/browse/MESOS-1392


Repository: mesos-git


Description
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See summary.


Diffs
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  src/master/detector.cpp 6436b8ee7e1ab6451a6b999a1cfbb2f79190e6ca 

Diff: https://reviews.apache.org/r/25663/diff/


Testing
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make check.


Thanks,

Jiang Yan Xu