Sangjin Lee created YARN-1692:
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Summary: ConcurrentModificationException in fair scheduler
AppSchedulable
Key: YARN-1692
URL: https://issues.apache.org/jira/browse/YARN-1692
Project: Hadoop YARN
Issue Type: Bug
Components: scheduler
Affects Versions: 2.0.5-alpha
Reporter: Sangjin Lee
We saw a ConcurrentModificationException thrown in the fair scheduler:
{noformat}
2014-02-07 01:40:01,978 ERROR
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler:
Exception in fair scheduler UpdateThread
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:926)
at java.util.HashMap$ValueIterator.next(HashMap.java:954)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.AppSchedulable.updateDemand(AppSchedulable.java:85)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSLeafQueue.updateDemand(FSLeafQueue.java:125)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSParentQueue.updateDemand(FSParentQueue.java:82)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.update(FairScheduler.java:217)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$UpdateThread.run(FairScheduler.java:195)
at java.lang.Thread.run(Thread.java:724)
{noformat}
The map that gets returned by FSSchedulerApp.getResourceRequests() are
iterated on without proper synchronization.
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