jianjin qin created YARN-10765:
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Summary: Fair scheduler continuous scheduling thread crashes while
sorting nodes
Key: YARN-10765
URL: https://issues.apache.org/jira/browse/YARN-10765
Project: Hadoop YARN
Issue Type: Bug
Components: scheduler
Affects Versions: 2.7.1, 2.7.0
Reporter: jianjin qin
Fix For: 3.0.0
Attachments:
0001-fix-fair-scheduler-continuous-scheduling-thread-cras.patch
NodeAvailableResourceComparator use variable nodes which contains to compare,
but nodeIdList is not same with nodes.keySet() during sort. when node removed
before sort, such as n2,n3 are removed, compare(n2, n3)=1 and compare(n3,
n2)=1, this violates the reflexivity of comparator, we may get the exception:
java.lang.IllegalArgumentException: Comparison method violates its general
contract!
{code:java}
2021-01-19 10:22:55,102 ERROR
org.apache.hadoop.yarn.YarnUncaughtExceptionHandler: Thread
Thread[FairSchedulerContinuousScheduling,5,main] threw an Exception.
java.lang.IllegalArgumentException: Comparison method violates its general
contract!
at java.util.TimSort.mergeLo(TimSort.java:747)
at java.util.TimSort.mergeAt(TimSort.java:483)
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.FairScheduler.continuousSchedulingAttempt(FairScheduler.java:1069)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$ContinuousSchedulingThread.run(FairScheduler.java:322)
{code}
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