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Review request for mesos, Benjamin Mahler and Michael Park.


Bugs: MESOS-8604
    https://issues.apache.org/jira/browse/MESOS-8604


Repository: mesos


Description
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When calculating the quota headroom, we failed to consider
ancestor's reservation allocated to the child. This leads
to under-estimation of available headroom and excessive
resources being set aside for headroom. See MESOS-8604.

This patches fixes this issue by counting ancestor's reservation
allocated to the child as allocated-reservation even though
the child itself has no reservation.


Diffs
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  src/master/allocator/mesos/hierarchical.cpp 
80e0a347d6641c922cf7c62bef220ff5c8864597 


Diff: https://reviews.apache.org/r/65806/diff/1/


Testing
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Thanks,

Meng Zhu

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