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From Wangda Tan <wheele...@gmail.com>
Subject Re: [DISCUSS] Merge YARN-6592 to trunk
Date Fri, 26 Jan 2018 02:36:48 GMT
Thanks Arun



On Fri, Jan 26, 2018 at 7:46 AM, Arun Suresh <asuresh@apache.org> wrote:

> Hello yarn-dev@
> We feel that the YARN-6592 dev branch mostly in shape to be merged into
> trunk. This branch adds support for placing containers in YARN using rich
> placement constraints. For example, this can be used by applications to
> co-locate containers on a node or rack (*affinity *constraint), spread
> containers across nodes or racks (*anti-affinity* constraint), or even
> specify the maximum number of containers on a node/rack (*cardinality *
> constraint).
> We have integrated this feature into the Distributed-Shell application for
> feature testing. We have performed end-to-end testing on moderately-sized
> clusters to verify that constraints work fine. Performance tests have been
> done via both SLS tests and Capacity Scheduler performance unit tests, and
> no regression was found. We have opened a JIRA to track Jenkins acceptance
> of the aggregated patch [2]. Documentation is in the process of being
> completed [3]. You can also check our design document for more details [4].
> Config flags are needed to enable this feature and it should not have any
> effect on YARN when turned off. Once merged, we plan to work on further
> improvements, which can be tracked in the umbrella YARN-7812 [5].
> Kindly do take a look at the branch and raise issues/concerns that need to
> be addressed before the merge.
> Many thanks to Konstantinos, Wangda, Panagiotis, Weiwei, and Sunil for
> their contributions to this effort, as well as Subru, Chris, Carlo, and
> Vinod for their inputs and discussions.
> Cheers
> -Arun
> [1] https://issues.apache.org/jira/browse/YARN-6592
> [2] https://issues.apache.org/jira/browse/YARN-7792
> [3] https://issues.apache.org/jira/browse/YARN-7780
> [4]
> https://issues.apache.org/jira/secure/attachment/12867869/YARN-6592-Rich-
> Placement-Constraints-Design-V1.pdf
> [5] https://issues.apache.org/jira/browse/YARN-7812

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