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https://issues.apache.org/jira/browse/MESOS-2891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jie Yu resolved MESOS-2891.
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Resolution: Fixed
Fix Version/s: 0.23.0
> Performance regression in hierarchical allocator.
> -------------------------------------------------
>
> Key: MESOS-2891
> URL: https://issues.apache.org/jira/browse/MESOS-2891
> Project: Mesos
> Issue Type: Bug
> Components: allocation, master
> Reporter: Benjamin Mahler
> Assignee: Jie Yu
> Priority: Blocker
> Labels: twitter
> Fix For: 0.23.0
>
> Attachments: Screen Shot 2015-06-18 at 5.02.26 PM.png, perf-kernel.svg
>
>
> For large clusters, the 0.23.0 allocator cannot keep up with the volume of
> slaves. After the following slave was re-registered, it took the allocator a
> long time to work through the backlog of slaves to add:
> {noformat:title=45 minute delay}
> I0618 18:55:40.738399 10172 master.cpp:3419] Re-registered slave
> 20150422-211121-2148346890-5050-3253-S4695
> I0618 19:40:14.960636 10164 hierarchical.hpp:496] Added slave
> 20150422-211121-2148346890-5050-3253-S4695
> {noformat}
> Empirically,
> [addSlave|https://github.com/apache/mesos/blob/dda49e688c7ece603ac7a04a977fc7085c713dd1/src/master/allocator/mesos/hierarchical.hpp#L462]
> and
> [updateSlave|https://github.com/apache/mesos/blob/dda49e688c7ece603ac7a04a977fc7085c713dd1/src/master/allocator/mesos/hierarchical.hpp#L533]
> have become expensive.
> Some timings from a production cluster reveal that the allocator spending in
> the low tens of milliseconds for each call to {{addSlave}} and
> {{updateSlave}}, when there are tens of thousands of slaves this amounts to
> the large delay seen above.
> We also saw a slow steady increase in memory consumption, hinting further at
> a queue backup in the allocator.
> A synthetic benchmark like we did for the registrar would be prudent here,
> along with visibility into the allocator's queue size.
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