[OAK-3317] ConcurrentModificationException when running SegmentOverflowExceptionIT

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.5, 1.4
• Component/s: segmentmk
• Labels: compaction gc
• Epic Link: SegmentMK revision GC
• Assignee: Michael Dürig
• Reporter: Michael Dürig
• Created: 31/Aug/15 12:15
• Updated: 16/Feb/21 09:52
• Resolved: 31/Aug/15 14:14

Description

Running org.apache.jackrabbit.oak.plugins.segment.SegmentOverflowExceptionIT
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2,426.873 sec <<< FAILURE!
run(org.apache.jackrabbit.oak.plugins.segment.SegmentOverflowExceptionIT)  Time elapsed: 2,426.373 sec  <<< ERROR!
java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
	at java.util.ArrayList$Itr.next(ArrayList.java:831)
	at org.apache.jackrabbit.oak.plugins.segment.CompactionMap.wasCompactedTo(CompactionMap.java:60)
	at org.apache.jackrabbit.oak.plugins.segment.Record.wasCompactedTo(Record.java:64)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentBlob.equals(SegmentBlob.java:213)
	at com.google.common.base.Objects.equal(Objects.java:55)
	at org.apache.jackrabbit.oak.plugins.memory.AbstractPropertyState.equal(AbstractPropertyState.java:53)
	at org.apache.jackrabbit.oak.plugins.memory.AbstractPropertyState.equals(AbstractPropertyState.java:90)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1176)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeBuilder.getNodeState(SegmentNodeBuilder.java:100)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.<init>(SegmentNodeStore.java:418)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore.merge(SegmentNodeStore.java:204)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentOverflowExceptionIT.run(SegmentOverflowExceptionIT.java:130)

This is caused by concurrently accessing the underlying list of maps in CompactionMap#remove.

Issue Links

• depends upon: OAK-2862 CompactionMap#compress() inefficient for large compaction maps