benwtrent opened a new issue, #14429:
URL: https://github.com/apache/lucene/issues/14429
### Description
Found this in the wild. I haven't been able to replicate :(
I don't even know what it means to hit this `fst.outputs.merge` branch and
under what conditions is it valid/invalid. Any pointers here would be useful.
We ran into a strange postings merge error in production.
The FST compiler reaches the "merge" line when merging some segments:
``` if (lastInput.length() == input.length && prefixLenPlus1 == 1 +
input.length) {
// same input more than 1 time in a row, mapping to
// multiple outputs
lastNode.output = fst.outputs.merge(lastNode.output, output);```
However, the "outputs" provided by `Lucene90BlockTreeTermsWriter` is
`ByteSequenceOutputs`, which does not override merge, and thus throws an
unsupported operation exception.
Given this, it seems like it should be "impossible" to reach the
"Outputs.merge" path when merging with the `Lucene90BlockTreeTermsWriter`, but
somehow it did.
Any ideas on where I should look?
```Caused by:
org.elasticsearch.common.io.stream.NotSerializableExceptionWrapper:
unsupported_operation_exception: null
at org.apache.lucene.util.fst.Outputs.merge(Outputs.java:95)
~[lucene-core-9.11.1.jar:?]
at org.apache.lucene.util.fst.FSTCompiler.add(FSTCompiler.java:936)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter$PendingBlock.append(Lucene90BlockTreeTermsWriter.java:593)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter$PendingBlock.compileIndex(Lucene90BlockTreeTermsWriter.java:562)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter$TermsWriter.writeBlocks(Lucene90BlockTreeTermsWriter.java:776)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter$TermsWriter.finish(Lucene90BlockTreeTermsWriter.java:1163)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter.write(Lucene90BlockTreeTermsWriter.java:402)
~[lucene-core-9.11.1.jar:?]
at org.apache.lucene.codecs.FieldsConsumer.merge(FieldsConsumer.java:95)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsWriter.merge(PerFieldPostingsFormat.java:204)
~[lucene-core-9.11.1.jar:?]
at org.apache.lucene.index.SegmentMerger.mergeTerms(SegmentMerger.java:211)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.SegmentMerger.mergeWithLogging(SegmentMerger.java:300)
~[lucene-core-9.11.1.jar:?]
at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:139)
~[lucene-core-9.11.1.jar:?]
at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:5293)
~[lucene-core-9.11.1.jar:?]
at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4761)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.IndexWriter$IndexWriterMergeSource.merge(IndexWriter.java:6582)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:660)
~[lucene-core-9.11.1.jar:?]
at
org.elasticsearch.index.engine.ElasticsearchConcurrentMergeScheduler.doMerge(ElasticsearchConcurrentMergeScheduler.java:134)
~[elasticsearch-8.15.0.jar:?]
at
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:721)
~[lucene-core-9.11.1.jar:?]```
### Version and environment details
Lucene 9.11.1
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