[TEZ-3869] Analyzer: Fix VertexInfo::getLastTaskToFinish comparison

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.9.1
• Hadoop Flags: Reviewed
• Assignee: Rajesh Balamohan
• Reporter: Rajesh Balamohan
• Created: 30/Nov/17 00:03
• Updated: 19/Mar/19 16:09
• Resolved: 03/Dec/17 22:08

Description

VertexInfo::getLastTaskToFinish incorrectly compares with getStartTimeInterval. This needs to be fixed. Observed timsort exceptions when analyzing some dag zips.

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)