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https://issues.apache.org/jira/browse/LUCENE-6906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15022610#comment-15022610
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Adrien Grand commented on LUCENE-6906:
--------------------------------------
There are quite fast indeed (I did not test with SimpleText but I assume it
would be fast as well). I put them in the Lucene54 test because they were quite
specific to the Lucene54 impl (using a sparse encoding only when there are more
than 1024 docs) but I can put them in the base class.
> Lucene54DocValuesFormat bug when a large segment does not have values
> ---------------------------------------------------------------------
>
> Key: LUCENE-6906
> URL: https://issues.apache.org/jira/browse/LUCENE-6906
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-6906.patch
>
>
> Mike reported getting the following stack trace during a merge:
> {noformat}
> java.lang.ArrayIndexOutOfBoundsException: -1
> at
> org.apache.lucene.util.packed.DirectMonotonicWriter.flush(DirectMonotonicWriter.java:64)
> at
> org.apache.lucene.util.packed.DirectMonotonicWriter.finish(DirectMonotonicWriter.java:126)
> at
> org.apache.lucene.codecs.lucene54.Lucene54DocValuesConsumer.writeSparseMissingBitset(Lucene54DocValuesConsumer.java:399)
> at
> org.apache.lucene.codecs.lucene54.Lucene54DocValuesConsumer.addNumericField(Lucene54DocValuesConsumer.java:207)
> at
> org.apache.lucene.codecs.lucene54.Lucene54DocValuesConsumer.addSortedField(Lucene54DocValuesConsumer.java:614)
> at
> org.apache.lucene.codecs.lucene54.Lucene54DocValuesConsumer.addSortedSetField(Lucene54DocValuesConsumer.java:653)
> at
> org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.addSortedSetField(PerFieldDocValuesFormat.java:131)
> at
> org.apache.lucene.codecs.DocValuesConsumer.mergeSortedSetField(DocValuesConsumer.java:736)
> at
> org.apache.lucene.codecs.DocValuesConsumer.merge(DocValuesConsumer.java:219)
> at
> org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:150)
> at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:105)
> at
> org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4075)
> at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3655)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:588)
> at
> org.elasticsearch.index.engine.ElasticsearchConcurrentMergeScheduler.doMerge(ElasticsearchConcurrentMergeScheduler.java:95)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:626)
> {noformat}
> This is due to the fact that the segment did not have any values and made
> DirectMonotonicWriter fail since it assumes at least one value (without
> explicitly testing it).
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