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Vinod Kumar Vavilapalli commented on YARN-2915: ----------------------------------------------- One thing that occurred to me in an offline conversation with [~subru] and [~leftnoteasy] is about the modeling of queues and their shares in different sub-clusters. As seems to be already proposed, it is very desirable to have a unified *logic queues* that are applicable across all sub-clusters. With unified logical queues, looks like there are some proposals for ways of how resources can get sub-divided amongst different sub-clusters. But to me, they already map to an existing concept in YARN - *Node Partitions* / node-labels ! Essentially you have *one YARN cluster* -> *multiple sub-clusters* -> *each sub-cluster with multiple node-partitions*. This can further be extended to more levels. For e.g. we can unify rack also under the same concept. The advantage of unifying this with node-partitions is that we can have - one single administrative view philosophy of sub-clusters, node-partitions, racks etc - unified configuration mechanisms: Today we support centralized and distributed node-partition mechanisms, exclusive / non-exclusive access etc. - unified queue-sharing models - today we already can assign X% of a node-partition to a queue. This way we can, again, reuse existing concepts, mental models and allocation policies - instead of creating specific policies for sub-cluster sharing like the user-based share that is proposed. We will have to dig deeper into the details, but it seems to me that node-partition and sub-cluster are equivalence classes except for the fact that two sub-clusters report to two different RMs (physically / implementation wise) which isn't the case today with node-partitions. Thoughts? /cc [~curino] [~chris.douglas] > Enable YARN RM scale out via federation using multiple RM's > ----------------------------------------------------------- > > Key: YARN-2915 > URL: https://issues.apache.org/jira/browse/YARN-2915 > Project: Hadoop YARN > Issue Type: New Feature > Components: nodemanager, resourcemanager > Reporter: Sriram Rao > Assignee: Subru Krishnan > Attachments: FEDERATION_CAPACITY_ALLOCATION_JIRA.pdf, > Federation-BoF.pdf, Yarn_federation_design_v1.pdf, federation-prototype.patch > > > This is an umbrella JIRA that proposes to scale out YARN to support large > clusters comprising of tens of thousands of nodes. That is, rather than > limiting a YARN managed cluster to about 4k in size, the proposal is to > enable the YARN managed cluster to be elastically scalable. -- This message was sent by Atlassian JIRA (v6.3.4#6332)