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https://issues.apache.org/jira/browse/LUCENE-5899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14108536#comment-14108536
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Michael McCandless commented on LUCENE-5899:
--------------------------------------------
Hi Littlestar, that's a spooky exception, can you provide a test case showing
how you hit it? Or describe what led up to it?
> Caused by: java.lang.ClassCastException:
> org.apache.lucene.codecs.MappingMultiDocsEnum cannot be cast to
> org.apache.lucene.index.DocsAndPositionsEnum
> -----------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-5899
> URL: https://issues.apache.org/jira/browse/LUCENE-5899
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/codecs
> Affects Versions: 4.9
> Reporter: Littlestar
> Fix For: 4.10
>
>
> Exception in thread "Lucene Merge Thread #0"
> org.apache.lucene.index.MergePolicy$MergeException:
> java.lang.ClassCastException: org.apache.lucene.codecs.MappingMultiDocsEnum
> cannot be cast to org.apache.lucene.index.DocsAndPositionsEnum
> at
> org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:545)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:518)
> Caused by: java.lang.ClassCastException:
> org.apache.lucene.codecs.MappingMultiDocsEnum cannot be cast to
> org.apache.lucene.index.DocsAndPositionsEnum
> at
> org.apache.lucene.codecs.PostingsConsumer.merge(PostingsConsumer.java:127)
> at org.apache.lucene.codecs.TermsConsumer.merge(TermsConsumer.java:110)
> at org.apache.lucene.codecs.FieldsConsumer.merge(FieldsConsumer.java:72)
> at
> org.apache.lucene.index.SegmentMerger.mergeTerms(SegmentMerger.java:399)
> at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:112)
> at
> org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4163)
> at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3759)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:405)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:482)
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