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https://issues.apache.org/jira/browse/LUCENE-5443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13900122#comment-13900122
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Shai Erera commented on LUCENE-5443:
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Right. I can create a patch a bit later, unless someone beats me to it...
> DocValuesProducer#ramBytesUsed throws ConcurrentModificationException
> ---------------------------------------------------------------------
>
> Key: LUCENE-5443
> URL: https://issues.apache.org/jira/browse/LUCENE-5443
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/codecs
> Affects Versions: 4.6, 4.6.1, 5.0, 4.7
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: 5.0, 4.7
>
>
> this came up in an [elasticsearch
> issue|https://github.com/elasticsearch/elasticsearch/issues/5104] that if you
> pull _#ramBytesUsed()_ while docvalues are loaded in a seperate thread you
> see a _ConcurrentModificationException_ here is an example:
> {noformat}
> Caused by: java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:926)
> at java.util.HashMap$ValueIterator.next(HashMap.java:954)
> at
> org.apache.lucene.codecs.lucene45.Lucene45DocValuesProducer.ramBytesUsed(Lucene45DocValuesProducer.java:291)
> at
> org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsReader.ramBytesUsed(PerFieldDocValuesFormat.java:308)
> at
> org.apache.lucene.index.SegmentDocValues.ramBytesUsed(SegmentDocValues.java:103)
> at
> org.apache.lucene.index.SegmentReader.ramBytesUsed(SegmentReader.java:555)
> {noformat}
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