I would suggest using the AMRMClient/AMRMClientAsync libraries for this kind of work. They take care of all the nuances like these.
Please also file a jira for the RM crash. That should not be happening. Thanks! Bikas -----Original Message----- From: Grandl Robert [mailto:rgra...@yahoo.com] Sent: Sunday, November 24, 2013 8:02 PM To: common-dev@hadoop.apache.org; Grandl Robert Subject: Re: Force reducer to execute on a specific host I found the fix. I had to add also a rack local request for reducer. And set the relaxLocality to false for both ANY and rack requests, in order to force data locality. robert On Sunday, November 24, 2013 6:32 PM, Grandl Robert <rgra...@yahoo.com> wrote: Hi guys, I am trying to run an experiment where I want the reducers to be forced executing on a specific host. The simplest way I found it is to modify in RMContainerAllocator such that whenever there is an addContainerReq(ContainerRequest) for a reducer, I simply do: addResourceRequest(req.priority, host_X_name, req.capability) and return, instead of setting the resourceName to ResourceRequest.ANY. Unfortunately when I pass such a ResourceRequest for reducers through a makeRemoteRequest, the RM crashes, giving an ugly exception like: FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error in handling event type NODE_UPDATE to the scheduler java.lang.NullPointerException at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue .assignContainers(LeafQueue.java:841) at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQue ue.assignContainersToChildQueues(ParentQueue.java:640) at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQue ue.assignContainers(ParentQueue.java:554) at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityS cheduler.nodeUpdate(CapacityScheduler.java:695) at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityS cheduler.handle(CapacityScheduler.java:739) at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityS cheduler.handle(CapacityScheduler.java:86) at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEve ntDispatcher$EventProcessor.run(ResourceManager.java:549) at java.lang.Thread.run(Thread.java:722) Do you have other suggestion how I can enforce reducers execution on a certain host ? Or do you know what I am doing wrong here ? Thanks, robert -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
