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Review request for mesos, Gastón Kleiman and Meng Zhu. Bugs: MESOS-9239 https://issues.apache.org/jira/browse/MESOS-9239 Repository: mesos Description ------- This type replaces the use of hashmaps keyed by resource names in favor of storing vectors of `pair<string,Value::Scalar>`, in order to avoid the performance penalty of using hashmaps. Running *HierarchicalAllocator_BENCHMARK_Test.DeclineOffers/21 shows the following improvement: Using 10000 agents and 1000 frameworks Added 1000 frameworks in 42.49ms -> 42.85ms (no change) Added 10000 agents in 7.69secs -> 4.89secs (normalized: 1 -> 0.64) round 0 allocate() took 5.42secs -> 3.53secs (nomralized: 1 -> 0.65) Diffs ----- src/master/allocator/sorter/drf/sorter.hpp 5a4fa5e2dca61168923261230b1f5c245354cbb7 Diff: https://reviews.apache.org/r/68731/diff/1/ Testing ------- make check Thanks, Benjamin Mahler