[jira] [Created] (LUCENE-8822) UnsupportedOperationException: unused: not a comparsion-based sort during IndexWriter flush

["Michael McCandless (JIRA)" <ji...@apache.org>]

Michael McCandless created LUCENE-8822:
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             Summary: UnsupportedOperationException: unused: not a comparsion-based sort during IndexWriter flush
                 Key: LUCENE-8822
                 URL: https://issues.apache.org/jira/browse/LUCENE-8822
             Project: Lucene - Core
          Issue Type: Bug
    Affects Versions: 7.6
            Reporter: Michael McCandless


We hit this very strange exception in production 7.x snapshot (near 7.6), OpenJDK 11:
{noformat}
Caused by: java.lang.UnsupportedOperationException: unused: not a comparison-based sort
at org.apache.lucene.util.MSBRadixSorter.compare(MSBRadixSorter.java:115)
at org.apache.lucene.util.Sorter.siftDown(Sorter.java:235)
at org.apache.lucene.util.Sorter.heapify(Sorter.java:228)
at org.apache.lucene.util.MSBRadixSorter.computeCommonPrefixLengthAndBuildHistogram(MSBRadixSorter.java:209)
at org.apache.lucene.util.MSBRadixSorter.radixSort(MSBRadixSorter.java:148)
at org.apache.lucene.util.MSBRadixSorter.radixSort(MSBRadixSorter.java:155)
at org.apache.lucene.util.MSBRadixSorter.sort(MSBRadixSorter.java:128)
at org.apache.lucene.util.MSBRadixSorter.sort(MSBRadixSorter.java:121)
at org.apache.lucene.util.bkd.MutablePointsReaderUtils.sort(MutablePointsReaderUtils.java:90)
at org.apache.lucene.util.bkd.BKDWriter.writeField1Dim(BKDWriter.java:497)
at org.apache.lucene.util.bkd.BKDWriter.writeField(BKDWriter.java:427)
at org.apache.lucene.codecs.lucene60.Lucene60PointsWriter.writeField(Lucene60PointsWriter.java:105)
at org.apache.lucene.index.PointValuesWriter.flush(PointValuesWriter.java:183)
at org.apache.lucene.index.DefaultIndexingChain.writePoints(DefaultIndexingChain.java:206)
at org.apache.lucene.index.DefaultIndexingChain.flush(DefaultIndexingChain.java:141)
at org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:470)
at org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:554)
at org.apache.lucene.index.DocumentsWriter.flushOneDWPT(DocumentsWriter.java:257)
at org.apache.lucene.index.IndexWriter.flushNextBuffer(IndexWriter.java:3157)
at com.amazon.lucene.index.Indexer.lambda$commit$0(Indexer.java:1129){noformat}
The exception makes no sense to me: when I look at {{MSBRadixSorter.computeCommonPrefixLengthAndBuildHistogram}} at that line it does NOT invoke {{Sorter.heapify}} so I'm mystified.  Maybe this is a JVM bug ...

 



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