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https://issues.apache.org/jira/browse/LUCENE-2420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12862463#action_12862463
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Steven Bethard commented on LUCENE-2420:
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I finally found the documentation saying that the maximum number of documents
is ~274 billion:
http://lucene.apache.org/java/3_0_1/fileformats.html
Google queries that failed to find this:
lucene index maximum documents
lucene document limit
lucene max docs
Maybe a bullet could be added to the FAQ (which does turn up for most of these
queries)?
http://wiki.apache.org/lucene-java/LuceneFAQ
As far as the exception goes, regardless of the transaction semantics, I really
don't think the code works correctly after numeric overflow. Once
SegmentWriteState.numDocsInStore is negative, I would expect code like
StoredFieldsWriter.flush to fail:
synchronized public void flush(SegmentWriteState state) throws IOException {
if (state.numDocsInStore > 0) {
...
Perhaps I'm wrong, but it seems like this is going to do the wrong thing when
SegmentWriteState.numDocsInStore is negative. If I'm not wrong, then it seems
sensible to me to raise an exception on numeric overflow.
> "fdx size mismatch" overflow causes RuntimeException
> ----------------------------------------------------
>
> Key: LUCENE-2420
> URL: https://issues.apache.org/jira/browse/LUCENE-2420
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 3.0.1
> Environment: CentOS 5.4
> Reporter: Steven Bethard
>
> I just saw the following error:
> java.lang.RuntimeException: after flush: fdx size mismatch: -512764976 docs
> vs 30257618564 length in bytes of _0.fdx file exists?=true
> at
> org.apache.lucene.index.StoredFieldsWriter.closeDocStore(StoredFieldsWriter.java:97)
> at
> org.apache.lucene.index.DocFieldProcessor.closeDocStore(DocFieldProcessor.java:51)
> at
> org.apache.lucene.index.DocumentsWriter.closeDocStore(DocumentsWriter.java:371)
> at
> org.apache.lucene.index.IndexWriter.flushDocStores(IndexWriter.java:1724)
> at
> org.apache.lucene.index.IndexWriter.doFlushInternal(IndexWriter.java:3565)
> at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3491)
> at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3482)
> at
> org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:1658)
> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:1621)
> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:1585)
> Note the negative SegmentWriteState.numDocsInStore. I assume this is because
> Lucene has a limit of 2 ^ 31 - 1 = 2147483647 (sizeof(int)) documents per
> index, though I couldn't find this documented clearly anywhere. It would have
> been nice to get this error earlier, back when I exceeded the limit, rather
> than now, after a bunch of indexing that was apparently doomed to fail.
> Hence, two suggestions:
> * State clearly somewhere that the maximum number of documents in a Lucene
> index is sizeof(int).
> * Throw an exception when an IndexWriter first exceeds this number rather
> than only on close.
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