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https://issues.apache.org/jira/browse/YARN-2273?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei Yan updated YARN-2273:
--------------------------
Attachment: YARN-2273.patch
> NPE in ContinuousScheduling Thread crippled RM after DN flap
> ------------------------------------------------------------
>
> Key: YARN-2273
> URL: https://issues.apache.org/jira/browse/YARN-2273
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler, resourcemanager
> Affects Versions: 2.3.0, 2.4.1
> Environment: cdh5.0.2 wheezy
> Reporter: Andy Skelton
> Attachments: YARN-2273.patch, YARN-2273.patch
>
>
> One DN experienced memory errors and entered a cycle of rebooting and
> rejoining the cluster. After the second time the node went away, the RM
> produced this:
> {code}
> 2014-07-09 21:47:36,571 INFO
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler:
> Application attempt appattempt_1404858438119_4352_000001 released container
> container_1404858438119_4352_01_000004 on node: host:
> node-A16-R09-19.hadoop.dfw.wordpress.com:8041 #containers=0
> available=<memory:8192, vCores:8> used=<memory:0, vCores:0> with event: KILL
> 2014-07-09 21:47:36,571 INFO
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler:
> Removed node node-A16-R09-19.hadoop.dfw.wordpress.com:8041 cluster capacity:
> <memory:335872, vCores:328>
> 2014-07-09 21:47:36,571 ERROR
> org.apache.hadoop.yarn.YarnUncaughtExceptionHandler: Thread
> Thread[ContinuousScheduling,5,main] threw an Exception.
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$NodeAvailableResourceComparator.compare(FairScheduler.java:1044)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$NodeAvailableResourceComparator.compare(FairScheduler.java:1040)
> at java.util.TimSort.countRunAndMakeAscending(TimSort.java:329)
> at java.util.TimSort.sort(TimSort.java:203)
> at java.util.TimSort.sort(TimSort.java:173)
> at java.util.Arrays.sort(Arrays.java:659)
> at java.util.Collections.sort(Collections.java:217)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.continuousScheduling(FairScheduler.java:1012)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.access$600(FairScheduler.java:124)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$2.run(FairScheduler.java:1306)
> at java.lang.Thread.run(Thread.java:744)
> {code}
> A few cycles later YARN was crippled. The RM was running and jobs could be
> submitted but containers were not assigned and no progress was made.
> Restarting the RM resolved it.
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