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https://issues.apache.org/jira/browse/SOLR-11898?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erick Erickson resolved SOLR-11898.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: 7.3

Thanks Jeff!

> ConcurrentModificationException when calling 
> org.apache.solr.core.SolrInfoBean.getMetricsSnapshot
> -------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-11898
>                 URL: https://issues.apache.org/jira/browse/SOLR-11898
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: metrics
>    Affects Versions: 7.1
>            Reporter: Jeff Miller
>            Assignee: Erick Erickson
>            Priority: Major
>              Labels: newbie
>             Fix For: 7.3
>
>         Attachments: SOLR-11898.patch
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> SOLR-11255 Updated to use  ConcurrentHashMap.newKeySet(); for all metricNames 
> implementation but missed a few classes.
> I see this exception happening once in a while:
> Cause0: java.util.ConcurrentModificationException Cause0-StackTrace: at 
> java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1558) at 
> java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580) 
> at 
> org.apache.solr.util.stats.MetricUtils.convertMetrics(MetricUtils.java:248) 
> at 
> org.apache.solr.util.stats.MetricUtils.convertMetrics(MetricUtils.java:226) 
> at org.apache.solr.core.SolrInfoBean.getMetricsSnapshot(SolrInfoBean.java:62)
>  
> Three classes weren't updated from using a HashSet for metricNames: 
> FastLRUCache, LFUCache and LRUCache



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