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From Neil Conway <>
Subject Re: Review Request 57254: Updated DRFSorter to support hierarchical roles.
Date Thu, 09 Mar 2017 16:44:22 GMT

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(Updated March 9, 2017, 4:44 p.m.)

Review request for mesos, Benjamin Bannier, Benjamin Mahler, and Michael Park.



Repository: mesos


This commit replaces the sorter's flat list of clients with a tree of
client names; this tree represents the hierarchical relationship between
sorter clients. Each node in the tree contains an (ordered) list of
pointers to child nodes. The tree might contain nodes that do not
correspond directly to sorter clients. For example, adding clients "a/b"
and "c/d" results in the following tree:

 -> a
   -> b
 -> c
   -> d

The `sort` member function still only returns one result for each
(active) client in the sorter. This is implemented by ensuring that each
sorter client is associated with a leaf node in the tree. Note that it
is possible for a leaf node to be transformed into an internal node by a
subsequent insertion; to handle this case, we "implicitly" create an
extra child node, which maintains the invariant that each client has a
leaf node. For example, if the client "a/b/x" is added to the tree
above, the result is:

 -> a
   -> b
     -> .
     -> x
 -> c
   -> d

The "." leaf node holds the allocation that has been made to the "a/b"
client itself; the "a/b" node holds the sum of all the allocations that
have been made to the subtree rooted at "a/b", which also includes

Diffs (updated)

  src/master/allocator/mesos/hierarchical.hpp 646f66e67d9c6b8c61fc6e6558a1db976a44c126 
  src/master/allocator/mesos/hierarchical.cpp 0059ccead90f32491591990c791e7fa905a864b7 
  src/master/allocator/sorter/drf/metrics.hpp 61568cb520826ab59d675824b212e0d3deb63764 
  src/master/allocator/sorter/drf/metrics.cpp 15aab32db5ca1a7a14080e9bbb7c65283be3ec20 
  src/master/allocator/sorter/drf/sorter.hpp 76329220e1115c1de7810fb69b943c78c078be59 
  src/master/allocator/sorter/drf/sorter.cpp ed54680cecb637931fc344fbcf8fd3b14cc24295 
  src/master/allocator/sorter/sorter.hpp b3029fcf7342406955760da53f1ae736769f308c 
  src/tests/hierarchical_allocator_tests.cpp cdf1f15b7802439b28405ca8f6634ce83e886630 
  src/tests/master_allocator_tests.cpp 7b0b786f1c6c53616fd7ae1f7f765752d94a4f83 
  src/tests/sorter_tests.cpp c93d236b13256f4022a811d019990ef81521aa77 





Neil Conway

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