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https://issues.apache.org/jira/browse/TEZ-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhiyuan Yang closed TEZ-3869.
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> Analyzer: Fix VertexInfo::getLastTaskToFinish comparison
> --------------------------------------------------------
>
> Key: TEZ-3869
> URL: https://issues.apache.org/jira/browse/TEZ-3869
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Priority: Minor
> Fix For: 0.9.1
>
> Attachments: TEZ-3869.1.patch, TEZ-3869.2.patch
>
>
> {{VertexInfo::getLastTaskToFinish}} incorrectly compares with
> getStartTimeInterval. This needs to be fixed. Observed timsort exceptions
> when analyzing some dag zips.
> {code}
> java.lang.IllegalArgumentException: Comparison method violates its general
> contract!
> at java.util.TimSort.mergeHi(TimSort.java:895)
> at java.util.TimSort.mergeAt(TimSort.java:512)
> at java.util.TimSort.mergeForceCollapse(TimSort.java:453)
> at java.util.TimSort.sort(TimSort.java:250)
> at java.util.Arrays.sort(Arrays.java:1435)
> at java.util.Collections.sort(Collections.java:230)
> at
> org.apache.tez.history.parser.datamodel.VertexInfo.getLastTaskToFinish(VertexInfo.java:542)
> {code}
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