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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5658) IllegalArgumentException from ByteBufferIndexInput.buildSlice
Date Sun, 01 Jun 2014 20:39:01 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14015079#comment-14015079
] 

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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