Review Request 20502: Introduced exponential backoff for slave registration retries.

[Jiang Yan Xu]

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Review request for mesos and Ben Mahler.


Bugs: MESOS-982
    https://issues.apache.org/jira/browse/MESOS-982


Repository: mesos-git


Description
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See summary.


Diffs
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  src/slave/slave.hpp 1e9879582315fabb76659e9f8eb03f90188fbfa0 
  src/slave/slave.cpp d6ec87c2232c2172f471ae30711b5da1c7050570 

Diff: https://reviews.apache.org/r/20502/diff/


Testing
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make check. Also tested the random backoff logic separately.


Thanks,

Jiang Yan Xu