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https://issues.apache.org/jira/browse/LUCENE-5899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14110144#comment-14110144
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Littlestar commented on LUCENE-5899:
------------------------------------
I post a mail to shenandoah develop maillist
MARK here.
http://icedtea.classpath.org/pipermail/shenandoah/2014-August/000163.html
Thanks.
> shenandoah GC can cause "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
> Environment: I test lucene on shenandoah with big memory +
> bigdata(32g, 128g).
> http://openjdk.java.net/jeps/189
> http://icedtea.classpath.org/hg/shenandoah/
> Reporter: Littlestar
> Priority: Minor
>
> User report of bizare ClassCastException when running some lucene code with
> the (experimental) shenandoah GC
> {code}
> 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)
> {code}
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