Review Request 65231: Fixed detaching task volume directories of destroyed frameworks.

[Chun-Hung Hsiao]

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Review request for mesos, Michael Park and Vinod Kone.


Bugs: MESOS-8460
    https://issues.apache.org/jira/browse/MESOS-8460


Repository: mesos


Description
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This patch prevents deferencing destroyed executors when detaching task
volume directories from the `/files` endpoint.


Diffs
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  src/slave/slave.hpp a07f046c7ed980bed3e3d0d2780295727b87ee44 
  src/slave/slave.cpp 1672c06894c25e7120bb8a1da15f7d6432eb5954 


Diff: https://reviews.apache.org/r/65231/diff/1/


Testing
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sudo make check


Thanks,

Chun-Hung Hsiao