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From "Varun Vasudev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4844) Upgrade fields of o.a.h.y.api.records.Resource from int32 to int64
Date Mon, 25 Apr 2016 17:11:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-4844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15256606#comment-15256606

Varun Vasudev commented on YARN-4844:

I'm a little concerned with the size of the changes required, coming in so close to the 2.8
release. Given the debate about the extent of the changes we want to make, can we put a patch
that changes the int32 to int64, adds getMemoryLong with a Private annotation(so that we can
make changes later if we wish) and only fixes the pending memory check that was added in 2.8?
We can do a follow up on how to fix this in the wider community. What do you think [~leftnoteasy]?

> Upgrade fields of o.a.h.y.api.records.Resource from int32 to int64
> ------------------------------------------------------------------
>                 Key: YARN-4844
>                 URL: https://issues.apache.org/jira/browse/YARN-4844
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>            Priority: Blocker
>         Attachments: YARN-4844.1.patch, YARN-4844.2.patch
> We use int32 for memory now, if a cluster has 10k nodes, each node has 210G memory, we
will get a negative total cluster memory.
> And another case that easier overflows int32 is: we added all pending resources of running
apps to cluster's total pending resources. If a problematic app requires too much resources
(let's say 1M+ containers, each of them has 3G containers), int32 will be not enough.
> Even if we can cap each app's pending request, we cannot handle the case that there're
many running apps, each of them has capped but still significant numbers of pending resources.
> So we may possibly need to upgrade int32 memory field (could include v-cores as well)
to int64 to avoid integer overflow. 

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