Andrei Sekretenko created MESOS-10128:
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Summary: Performance regression in
HierarchicalAllocations_BENCHMARK_Test.PersistentVolumes
Key: MESOS-10128
URL: https://issues.apache.org/jira/browse/MESOS-10128
Project: Mesos
Issue Type: Bug
Reporter: Andrei Sekretenko
Assignee: Andrei Sekretenko
Compared to 1.9.0, HierarchicalAllocations_BENCHMARK_Test.PersistentVolumes ran
on 1.10.x branch/current master shows a regression (up to 50 times in some
cases) and exhibits a quadratic dependence of allocation time versus the number
of agents in the few-framework cases.
This regression was introduced by
https://reviews.apache.org/r/71460
which employed a single `Resources` object to track offered/allocated resources
of all agents on the cluster
and exacerbated by https://reviews.apache.org/r/71488 that followed a similar
approach.
In the case when resources of agents are non-addable (for example, each agent
has an unique persistent volume), this results in O(N^2) asymptotic time
complexity versus the number of agents due to the addition/subtraction of
Resources being O(X*Y) where X and Y are number of individual `Resource`s on
the left and on the right side.
Moreover, the approach taken in those PRs violates the convention that
`Resources` belonging to different agents should not be added/subtracted.
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