[LUCENE-5443] DocValuesProducer#ramBytesUsed throws ConcurrentModificationException

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.6, 4.6.1, 4.7, 6.0
• Fix Version/s: 4.7, 6.0
• Component/s: core/codecs
• Lucene Fields: New, Patch Available
• Assignee: Shai Erera
• Reporter: Simon Willnauer
• Created: 13/Feb/14 07:15
• Updated: 28/Aug/22 14:00
• Resolved: 13/Feb/14 16:38

Description

this came up in an elasticsearch issue that if you pull #ramBytesUsed() while docvalues are loaded in a seperate thread you see a ConcurrentModificationException here is an example:

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)