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https://issues.apache.org/jira/browse/YARN-5035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15301605#comment-15301605
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Arun Suresh commented on YARN-5035:
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bq. 1/2 + 1/4 + ... converges nicely and is somewhat easier to reason about
than say 1/3 + 1/9 + ....
Actually, given that it only converges at infinity, dont think it makes a
difference.... But I do agree, keeping it as 0.5 for the time-being should be
fine.
+1 to the latest patch (pending jenkins)
> FairScheduler: Adjust maxAssign dynamically when assignMultiple is turned on
> ----------------------------------------------------------------------------
>
> Key: YARN-5035
> URL: https://issues.apache.org/jira/browse/YARN-5035
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: fairscheduler
> Affects Versions: 2.8.0
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Attachments: yarn-5035-1.patch, yarn-5035-2.patch, yarn-5035-3.patch
>
>
> When assignMultiple is turned on, today the number of containers allocated to
> node within a single heartbeat is determined by maxAssign. Picking a higher
> value for this prevents the spreading of the workload, and a smaller number
> leads to slow ramp up.
> The proposal is to make it dynamic - half of the unallocated resources on the
> node.
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