[LUCENE-1521] "fdx size mismatch" exception in StoredFieldsWriter.closeDocStore() when closing index with 500M documents

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.4
• Fix Version/s: 2.4.1, 2.9
• Component/s: core/index
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Shon Vella
• Created: 16/Jan/09 15:28
• Updated: 28/Aug/22 11:57
• Resolved: 19/Feb/09 10:10

Description

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.

Issue Links

• is related to: LUCENE-1519 Change Primitive Data Types from int to long in class SegmentMerger.java