Simon Willnauer created LUCENE-5443:
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             Summary: 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: 4.6.1, 4.6, 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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