Review Request: Fixes a bug when a coordinator tried to fill positions that other replicas had already learned were truncated (note that the test added failed before the rest of the patch got applied).

[Benjamin Hindman]

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https://reviews.apache.org/r/4867/
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Review request for mesos and John Sirois.


Summary
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See summary.


Diffs
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  src/log/coordinator.hpp 16b15f0 
  src/log/coordinator.cpp 25127ee 
  src/log/log.hpp ebdb0b8 
  src/log/replica.cpp 8d03304 
  src/tests/log_tests.cpp 97712dd 

Diff: https://reviews.apache.org/r/4867/diff


Testing
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make check


Thanks,

Benjamin