[LUCENE-5658] IllegalArgumentException from ByteBufferIndexInput.buildSlice

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 4.8
• Component/s: core/store
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Shai Erera
• Created: 08/May/14 20:37
• Updated: 28/Aug/22 14:06

Description

I've received an email with the following stacktrace:

Exception in thread "Lucene Merge Thread #73" org.apache.lucene.index.MergePolicy$MergeException: java.lang.IllegalArgumentException
	at org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:545)
	at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:518)
Caused by: java.lang.IllegalArgumentException
	at java.nio.Buffer.limit(Buffer.java:278)
	at org.apache.lucene.store.ByteBufferIndexInput.buildSlice(ByteBufferIndexInput.java:259)
	at org.apache.lucene.store.ByteBufferIndexInput.buildSlice(ByteBufferIndexInput.java:230)
	at org.apache.lucene.store.ByteBufferIndexInput.clone(ByteBufferIndexInput.java:187)
	at org.apache.lucene.store.MMapDirectory$1.openFullSlice(MMapDirectory.java:211)
	at org.apache.lucene.store.CompoundFileDirectory.readEntries(CompoundFileDirectory.java:138)
	at org.apache.lucene.store.CompoundFileDirectory.<init>(CompoundFileDirectory.java:105)
	at org.apache.lucene.index.SegmentReader.readFieldInfos(SegmentReader.java:209)
	at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:99)
	at org.apache.lucene.index.ReadersAndUpdates.getReader(ReadersAndUpdates.java:142)
	at org.apache.lucene.index.ReadersAndUpdates.getReaderForMerge(ReadersAndUpdates.java:624)
	at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4068)
	at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3728)
	at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:405)
	at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:482)

According to the email, it happens randomly while indexing Wikipedia, on 4.8.0. As far as I understood, the indexer creates 4 indexes in parallel, by a total of 48 threads. Each index is created in a separate directory, and there's no sharing of MP or MS instances between the writers (in fact, default settings are used). This could explain the Lucene Merge Thread #73. The indexing process ends w/ a forceMerge(1). If that call is omitted, the exception doesn't reproduce. Also, since it doesn't happen always, there's no simple testcase which reproduces.

I've asked the reporter to add more info to the issue, but opening the issue now so we could check and hopefully fix before 4.8.1.

I checked the stacktrace against trunk, but not all the lines align (e.g. at org.apache.lucene.store.MMapDirectory$1.openFullSlice(MMapDirectory.java:211) is only in 4.8), but I haven't dug deeper yet...