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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