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https://issues.apache.org/jira/browse/SOLR-6551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14147667#comment-14147667
 ] 

Noble Paul commented on SOLR-6551:
----------------------------------

the following methods must be causing the problem
{code:java}
 public long getTotalLogsSize() {
    long size = 0;
    synchronized (logs) {
      for (TransactionLog log : logs) {
        size += log.getLogSize();
      }
    }
    return size;
  }

  public long getTotalLogsNumber() {
    return logs.size();
  }
{code}

> ConcurrentModificationException in UpdateLog
> --------------------------------------------
>
>                 Key: SOLR-6551
>                 URL: https://issues.apache.org/jira/browse/SOLR-6551
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>
> {code}
> null:java.util.ConcurrentModificationException
>        at java.util.LinkedList$ListItr.checkForComodification(Unknown Source)
>        at java.util.LinkedList$ListItr.next(Unknown Source)
>        at 
> org.apache.solr.update.UpdateLog.getTotalLogsSize(UpdateLog.java:199)
>        at 
> org.apache.solr.update.DirectUpdateHandler2.getStatistics(DirectUpdateHandler2.java:871)
>        at 
> org.apache.solr.handler.admin.SolrInfoMBeanHandler.getMBeanInfo(SolrInfoMBeanHandler.java:159)
> {code}



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