Hi Dmitry, Seems to be an interesting case, would like some more clarifications in this regard : 1. How many NM's ? Is it a hetergenous cluster or all the nodes have same resource capacity ? by 3000 cores if same config then expecting around 100 nodes, am i correct ? 2. How many applications are running and how many have got finished (basically available in RM) ? By 35000 you mean finished and running applications ? 3. Weather after some time, tasks are getting assigned ? Also is it only this host not getting assigned or no other host also gets any containers assigned ?
I suspect this issue might be similar to YARN-3990, hence the above questions. Further you can check the RM logs and inform weather you see some similar logs as below 2015-07-29 19:39:03,416 | INFO | AsyncDispatcher event handler | Size of event-queue is 14000 | AsyncDispatcher.java:235 2015-07-29 19:39:03,417 | INFO | AsyncDispatcher event handler | Size of event-queue is 15000 | AsyncDispatcher.java:235 Regards, + Naga ________________________________ From: Dmitry Sivachenko [[email protected]] Sent: Wednesday, September 23, 2015 03:57 To: [email protected] Subject: node remains unused after reboot Hello! I am using hadoop-2.7.1. I have a large map job running (total cores available on the cluster about 3000, total tasks 35000). In the middle of this process one server reboots. After reboot, nodemanager starts successfully end registers with resource manager: 2015-09-23 01:06:24,656 INFO [main] nodemanager.NodeStatusUpdaterImpl (NodeStatusUpdaterImpl.java:registerWithRM(311)) - Notifying ContainerManager to unblock new container-requests In YARN web-interface I see this host as active, but VCores used remains zero (see screenshot). But the map job mentioned is still running and have about 12000 pending tasks. Why this host does not receive tasks to run? PS: I recently upgraded from 2.4.1 and I did not notice such a problem with 2.4.1: new tasks were spawning immediately after reboot. Thanks! [cid:[email protected]]
