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https://issues.apache.org/jira/browse/YARN-1412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829264#comment-13829264
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gaurav gupta commented on YARN-1412:
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Yes All the nodes are on the same Rack.
Here is the experiment that I did to verify the theory
1. Cluster size: 36 nodes
2. yarn.scheduler.capacity.node-locality-delay is set to 36
3. Asked for 36 containers with priority 0
4. I requested containers with (node=yes, rack=yes,relax-locality=true)
But I still see that the containers are allocated on different nodes.
> Allocating Containers on a particular Node in Yarn
> --------------------------------------------------
>
> Key: YARN-1412
> URL: https://issues.apache.org/jira/browse/YARN-1412
> Project: Hadoop YARN
> Issue Type: Bug
> Environment: centos, Hadoop 2.2.0
> Reporter: gaurav gupta
>
> Summary of the problem:
> If I pass the node on which I want container and set relax locality default
> which is true, I don't get back the container on the node specified even if
> the resources are available on the node. It doesn't matter if I set rack or
> not.
> Here is the snippet of the code that I am using
> AMRMClient<ContainerRequest> amRmClient = AMRMClient.createAMRMClient();;
> String host = "h1";
> Resource capability = Records.newRecord(Resource.class);
> capability.setMemory(memory);
> nodes = new String[] {host};
> // in order to request a host, we also have to request the rack
> racks = new String[] {"/default-rack"};
> List<ContainerRequest> containerRequests = new
> ArrayList<ContainerRequest>();
> List<ContainerId> releasedContainers = new ArrayList<ContainerId>();
> containerRequests.add(new ContainerRequest(capability, nodes, racks,
> Priority.newInstance(priority)));
> if (containerRequests.size() > 0) {
> LOG.info("Asking RM for containers: " + containerRequests);
> for (ContainerRequest cr : containerRequests) {
> LOG.info("Requested container: {}", cr.toString());
> amRmClient.addContainerRequest(cr);
> }
> }
> for (ContainerId containerId : releasedContainers) {
> LOG.info("Released container, id={}", containerId.getId());
> amRmClient.releaseAssignedContainer(containerId);
> }
> return amRmClient.allocate(0);
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