[LUCENE-10595] TestGroupFacetCollector#testRandom has caught IndexOutOfBoundsException a couple times

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: modules/grouping
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Greg Miller
• Created: 29/May/22 09:21
• Updated: 28/Aug/22 16:41

Description

Random testing has caught an IndexOutOfBoundsException a couple times now in org.apache.lucene.search.grouping.TestGroupFacetCollector.testRandom. I was able to reproduce locally with ./gradlew :lucene:grouping:test --tests "org.apache.lucene.search.grouping.TestGroupFacetCollector.testRandom" -Ptests.jvms=4 -Ptests.haltonfailure=false -Ptests.jvmargs=-XX:TieredStopAtLevel=1 -Ptests.seed=91EC8BE9DE2A5BAB -Ptests.multiplier=2 -Ptests.badapples=false -Ptests.file.encoding=US-ASCII.

From what I can tell, the exception is coming from way down in ByteBuffersDataInput#readBytes on this line. Popping the stack a bit, it seems like the issue is maybe in TermGroupFacetCollector$MV$SegmentResult#nextTerm.

I'm not totally sure if this is an actual bug or a bug in testing methodology. Haven't had time to dig in further and likely won't in the near future, so opening this Jira to track.