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From "Elliot Metsger (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1521) "fdx size mismatch" exception in StoredFieldsWriter.closeDocStore() when closing index with 500M documents
Date Thu, 27 Aug 2009 20:44:59 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748558#action_12748558
] 

Elliot Metsger commented on LUCENE-1521:
----------------------------------------

Nevermind, it doesn't look like this is an occurrence of this bug.  Not sure what happened...
underlying storage is a ZFS file system.  Anyway, this thread http://www.mail-archive.com/solr-user@lucene.apache.org/msg22264.html
was helpful, explaining what may be happening.

> "fdx size mismatch" exception in StoredFieldsWriter.closeDocStore() when closing index
with 500M documents
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1521
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1521
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.4
>            Reporter: Shon Vella
>            Assignee: Michael McCandless
>            Priority: Critical
>             Fix For: 2.4.1, 2.9
>
>
> When closing index that contains 500,000,000 randomly generated documents, an exception
is thrown:
> java.lang.RuntimeException: after flush: fdx size mismatch: 500000000 docs vs 4000000004
length in bytes of _0.fdx
> 	at org.apache.lucene.index.StoredFieldsWriter.closeDocStore(StoredFieldsWriter.java:94)
> 	at org.apache.lucene.index.DocFieldConsumers.closeDocStore(DocFieldConsumers.java:83)
> 	at org.apache.lucene.index.DocFieldProcessor.closeDocStore(DocFieldProcessor.java:47)
> 	at org.apache.lucene.index.DocumentsWriter.closeDocStore(DocumentsWriter.java:367)
> 	at org.apache.lucene.index.IndexWriter.flushDocStores(IndexWriter.java:1688)
> 	at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3518)
> 	at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3442)
> 	at org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:1623)
> 	at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:1588)
> 	at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:1562)
>         ...
> This appears to be a bug at StoredFieldsWriter.java:93:
>       if (4+state.numDocsInStore*8 != state.directory.fileLength(state.docStoreSegmentName
+ "." + IndexFileNames.FIELDS_INDEX_EXTENSION))
> where the multiplication by 8 is causing integer overflow. The fix would be to cast state.numDocsInStore
to long before multiplying.
> It appears that this is another instance of the mistake that caused bug LUCENE-1519.
I did a cursory seach for \*8 against the code to see if there might be yet more instances
of the same mistake, but found none. 

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