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From "Lohit Vijayarenu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-502) RM crash with NPE on NODE_REMOVED event
Date Fri, 22 Mar 2013 19:09:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13611086#comment-13611086

Lohit Vijayarenu commented on YARN-502:

Looks like node might already be removed from nodes map and cleanup was happening on removed

FSSchedulerNode node = nodes.get(rmNode.getNodeID());
    Resources.subtractFrom(clusterCapacity, rmNode.getTotalCapability());

    // Remove running containers
    List<RMContainer> runningContainers = node.getRunningContainers();
    for (RMContainer container : runningContainers) {

I am trying to find out case where node might have been removed. This was not called twice
because I do not see the corresponding log line 
LOG.info("Removed node " + rmNode.getNodeAddress() +
        " cluster capacity: " + clusterCapacity);

Either node was removed somewhere else or we tried to remove node which was not in map. Either
way, having check for NPE makes sense in this. 
> RM crash with NPE on NODE_REMOVED event
> ---------------------------------------
>                 Key: YARN-502
>                 URL: https://issues.apache.org/jira/browse/YARN-502
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.0.3-alpha
>            Reporter: Lohit Vijayarenu
> While running some test and adding/removing nodes, we see RM crashed with the below exception.
We are testing with fair scheduler and running hadoop-2.0.3-alpha
> {noformat}
> 2013-03-22 18:54:27,015 INFO org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl:
Deactivating Node YYYY:55680 as it is now LOST
> 2013-03-22 18:54:27,015 INFO org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl:
YYYY:55680 Node Transitioned from UNHEALTHY to LOST
> 2013-03-22 18:54:27,015 FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager:
Error in handling event type NODE_REMOVED to the scheduler
> java.lang.NullPointerException
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.removeNode(FairScheduler.java:619)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:856)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:98)
>         at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:375)
>         at java.lang.Thread.run(Thread.java:662)
> 2013-03-22 18:54:27,016 INFO org.apache.hadoop.yarn.server.resourcemanager.ResourceManager:
Exiting, bbye..
> 2013-03-22 18:54:27,020 INFO org.mortbay.log: Stopped SelectChannelConnector@XXXX:50030
> {noformat}

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