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https://issues.apache.org/jira/browse/LUCENE-5658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14015079#comment-14015079
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Uwe Schindler commented on LUCENE-5658:
---------------------------------------
Hi,
I found the bug while debugging LUCENE-5722: The issue here is the limit on the
last chunk, which is calculated in a wrong way if the slice ends exactly at the
boundary of chunkSize.
> IllegalArgumentException from ByteBufferIndexInput.buildSlice
> -------------------------------------------------------------
>
> Key: LUCENE-5658
> URL: https://issues.apache.org/jira/browse/LUCENE-5658
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/store
> Affects Versions: 4.8
> Reporter: Shai Erera
>
> I've received an email with the following stacktrace:
> {noformat}
> 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)
> {noformat}
> 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...
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