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From Sunil G <sun...@apache.org>
Subject [DISCUSS] Merge Absolute resource configuration support in Capacity Scheduler (YARN-5881) to trunk
Date Fri, 24 Nov 2017 17:49:06 GMT
Hi All,

We would like to bring up the discussion of merging “absolute min/max
resources support in capacity scheduler” branch (YARN-5881) [2] into trunk
in a few weeks. The goal is to get it in for Hadoop 3.1.

*Major work happened in this branch*

   - YARN-6471. Support to add min/max resource configuration for a queue
   - YARN-7332. Compute effectiveCapacity per each resource vector
   - YARN-7411. Inter-Queue preemption's computeFixpointAllocation need to
   handle absolute resources.

*Regarding design details*

Please refer [1] for detailed design document.

*Regarding to testing:*

We did extensive tests for the feature in the last couple of months.
Comparing to latest trunk.

- For SLS benchmark: We didn't see observable performance gap from
simulated test based on 8K nodes SLS traces (1 PB memory). We got 3k+
containers allocated per second.

- For microbenchmark: We use performance test cases added by YARN 6775, it
did not show much performance regression comparing to trunk.

*YARN-5881* <https://issues.apache.org/jira/browse/YARN-5881>

#ResourceTypes = 2. Avg of fastest 20: 55294.52
#ResourceTypes = 2. Avg of fastest 20: 55401.66

*trunk*
#ResourceTypes = 2. Avg of fastest 20: 55865.92
#ResourceTypes = 2. Avg of fastest 20: 55096.418

*Regarding to API stability:*

All newly added @Public APIs are @Unstable.

Documentation jira [3] could help to provide detailed configuration
details. This feature works from end-to-end and we are running this in our
development cluster for last couple of months and undergone good amount of
testing. Branch code is run against trunk and tracked via [4].

We would love to get your thoughts before opening a voting thread.

Special thanks to a team of folks who worked hard and contributed towards
this efforts including design discussion / patch / reviews, etc.: Wangda
Tan, Vinod Kumar Vavilappali, Rohith Sharma K S.

[1] :
https://issues.apache.org/jira/secure/attachment/12855984/YARN-5881.Support.Absolute.Min.Max.Resource.In.Capacity.Scheduler.design-doc.v1.pdf
[2] : https://issues.apache.org/jira/browse/YARN-5881

[3] : https://issues.apache.org/jira/browse/YARN-7533

[4] : https://issues.apache.org/jira/browse/YARN-7510

Thanks,

Sunil G and Wangda Tan

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