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https://issues.apache.org/jira/browse/MESOS-9806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16913709#comment-16913709
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Benjamin Mahler commented on MESOS-9806:
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commit b6c87d7c44346b2497ace65b1d2060ee423aa772
Author: Benjamin Mahler <bmah...@apache.org>
Date: Wed Aug 21 20:10:42 2019 -0400
Eliminated double lookups in the allocator.
Review: https://reviews.apache.org/r/71345
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commit 790c4e72e1460035b13bf27f2cb8999709e9767e
Author: Benjamin Mahler <bmah...@apache.org>
Date: Wed Aug 21 20:11:31 2019 -0400
Avoid duplicate allocatableTo call in the allocator.
Review: https://reviews.apache.org/r/71346
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> Address allocator performance regression due to the removal of quota role
> sorter.
> ---------------------------------------------------------------------------------
>
> Key: MESOS-9806
> URL: https://issues.apache.org/jira/browse/MESOS-9806
> Project: Mesos
> Issue Type: Improvement
> Components: allocation
> Reporter: Meng Zhu
> Assignee: Meng Zhu
> Priority: Critical
> Labels: resource-management
>
> In MESOS-9802, we removed the quota role sorter which is tech debt.
> However, this slows down the allocator. The problem is that in the first
> stage, even though a cluster might have no active roles with non-default
> quota, the allocator will now have to sort and go through each and every role
> in the cluster. Benchmark result shows that for 1k roles with 2k frameworks,
> the allocator could experience ~50% performance degradation.
> There are a couple of ways to address this issue. For example, we could make
> the sorter aware of quota. And add a method, say `sortQuotaRoles`, to return
> all the roles with non-default quota. Alternatively, an even better approach
> would be to deprecate the sorter concept and just have two standalone
> functions e.g. sortRoles() and sortQuotaRoles() that takes in the role tree
> structure (not yet exist in the allocator) and return the sorted roles.
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