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https://issues.apache.org/jira/browse/YARN-4743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15613417#comment-15613417
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Yufei Gu edited comment on YARN-4743 at 10/27/16 10:16 PM:
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[~gzh1992n], since we're doing batch review, I upload patch v5 for you
including some changes in doc. So [~kasha] can review and commit.
was (Author: yufeigu):
[~gzh1992n], since we're doing batch review, I upload patch v5 for you. So
[~kasha] can review and commit.
> ResourceManager crash because TimSort
> -------------------------------------
>
> Key: YARN-4743
> URL: https://issues.apache.org/jira/browse/YARN-4743
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 3.0.0-alpha2
> Reporter: Zephyr Guo
> Assignee: Zephyr Guo
> Labels: oct16-easy
> Fix For: 3.0.0-alpha2
>
> Attachments: YARN-4743-v1.patch, YARN-4743-v2.patch,
> YARN-4743-v3.patch, YARN-4743-v4.patch, YARN-4743-v5.patch, timsort.log
>
>
> {code}
> 2016-02-26 14:08:50,821 FATAL
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error in
> handling event type NODE_UPDATE to the scheduler
> java.lang.IllegalArgumentException: Comparison method violates its general
> contract!
> at java.util.TimSort.mergeHi(TimSort.java:868)
> at java.util.TimSort.mergeAt(TimSort.java:485)
> at java.util.TimSort.mergeCollapse(TimSort.java:410)
> at java.util.TimSort.sort(TimSort.java:214)
> 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.FSLeafQueue.assignContainer(FSLeafQueue.java:316)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSParentQueue.assignContainer(FSParentQueue.java:240)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.attemptScheduling(FairScheduler.java:1091)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.nodeUpdate(FairScheduler.java:989)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:1185)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:112)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:684)
> at java.lang.Thread.run(Thread.java:745)
> 2016-02-26 14:08:50,822 INFO
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Exiting, bbye..
> {code}
> Actually, this bug found in 2.6.0-cdh5.4.7. {{FairShareComparator}} is not
> transitive.
> We get NaN when memorySize=0 and weight=0.
> {code:title=FairSharePolicy.java}
> useToWeightRatio1 = s1.getResourceUsage().getMemorySize() /
> s1.getWeights().getWeight(ResourceType.MEMORY)
> {code}
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