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Date: Wed, 16 Jun 2010 16:44:23 -0400 (EDT)
From: "Tim Smith (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-2501) ArrayIndexOutOfBoundsException in
 ByteBlockPool.allocSlice
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    [ https://issues.apache.org/jira/browse/LUCENE-2501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879489#action_12879489 ] 

Tim Smith commented on LUCENE-2501:
-----------------------------------

will do

may take some time before it occurs again

also, if this boils down to a synchronization error of some sort, the extra file io done to write the trace info to disk may add some implicit synchronization/slowdown that may result in not being able to reproduce the issue (i've seen this occur on non-lucene related synchronization issues, add the extra debug logging and it never fails anymore)

> ArrayIndexOutOfBoundsException in ByteBlockPool.allocSlice
> ----------------------------------------------------------
>
>                 Key: LUCENE-2501
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2501
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 3.0.1
>            Reporter: Tim Smith
>
> I'm seeing the following exception during indexing:
> {code}
> Caused by: java.lang.ArrayIndexOutOfBoundsException: 14
> at org.apache.lucene.index.ByteBlockPool.allocSlice(ByteBlockPool.java:118)
> at org.apache.lucene.index.TermsHashPerField.writeByte(TermsHashPerField.java:490)
> at org.apache.lucene.index.TermsHashPerField.writeVInt(TermsHashPerField.java:511)
> at org.apache.lucene.index.FreqProxTermsWriterPerField.writeProx(FreqProxTermsWriterPerField.java:104)
> at org.apache.lucene.index.FreqProxTermsWriterPerField.newTerm(FreqProxTermsWriterPerField.java:120)
> at org.apache.lucene.index.TermsHashPerField.add(TermsHashPerField.java:468)
> at org.apache.lucene.index.DocInverterPerField.processFields(DocInverterPerField.java:174)
> at org.apache.lucene.index.DocFieldProcessorPerThread.processDocument(DocFieldProcessorPerThread.java:246)
> at org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:774)
> at org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:757)
> at org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:2085)
> ... 37 more
> {code}
> This seems to be caused by the following code:
> {code}
>     final int level = slice[upto] & 15;
>     final int newLevel = nextLevelArray[level];
>     final int newSize = levelSizeArray[newLevel];
> {code}
> this can result in "level" being a value between 0 and 14
> the array nextLevelArray is only of size 10
> i suspect the solution would be to either max the level to 10, or to add more entries to the nextLevelArray so it has 15 entries
> however, i don't know if something more is going wrong here and this is just where the exception hits from a deeper issue

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