[jira] [Commented] (YARN-6101) Delay scheduling for node resource balance

["He Tianyi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-6101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15852480#comment-15852480 ] 

He Tianyi commented on YARN-6101:
---------------------------------

Thanks for reply, [~tangzhankun].
It's a typo, memory should be 1 GB left.

I cannot share raw SLS configuration since it is generated directly from a production cluster (with 2500 nodes), by tracking all applications submitted on that day, including Spark, MapReduce and other frameworks. 

> Delay scheduling for node resource balance
> ------------------------------------------
>
>                 Key: YARN-6101
>                 URL: https://issues.apache.org/jira/browse/YARN-6101
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>            Reporter: He Tianyi
>            Priority: Minor
>         Attachments: YARN-6101.preliminary.0000.patch
>
>
> We observed that, in today's cluster, usage of Spark has dramatically increased. 
> This introduced a new issue that CPU/MEM utilization for single node may become imbalanced due to Spark is generally more memory intensive. For example, after a node with capability (48 cores, 192 GB memory) cannot satisfy a (1 core, 2 GB memory) request if current used resource is (20 cores, 191 GB memory), with plenty of total available resource across the whole cluster.
> A thought for avoiding the situation is to introduce some strategy during scheduling.
> This JIRA proposes a delay-scheduling-alike approach to achieve better balance between different type of resources on each node.
> The basic idea is consider dominant resource for each node, and when a scheduling opportunity on a particular node is offered to a resource request, better make sure the allocation is changing dominant resource of the node, or, in worst case, allocate at once when number of offered scheduling opportunities exceeds a certain number.
> With YARN SLS and a simulation file with hybrid workload (MR+Spark), the approach improved cluster resource usage by nearly 5%. And after deployed to production, we observed a 8% improvement.



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