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Date: Wed, 20 Jul 2011 09:58:58 +0000 (UTC)
From: "Denny Ye (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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 <1986488647.7265.1311155938485.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] [Created] (HDFS-2176) Avoid ConcurrentModificationException
 when FSImage initialization
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Avoid ConcurrentModificationException when FSImage initialization
-----------------------------------------------------------------

                 Key: HDFS-2176
                 URL: https://issues.apache.org/jira/browse/HDFS-2176
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 0.21.0
            Reporter: Denny Ye
            Priority: Minor


Below code may cause ConcurrentModificationException when some of fsimage directory equals editlog directory :
Method: FSImage.setStorageDirectories(Collection<URI> fsNameDirs, Collection<URI> fsEditsDirs)
Code:
 for (URI dirName : fsNameDirs) {
      ...     
      boolean isAlsoEdits = false;
      for (URI editsDirName : fsEditsDirs) {
        if (editsDirName.compareTo(dirName) == 0) {
          isAlsoEdits = true;
          fsEditsDirs.remove(editsDirName);
          break;
        }
      }
   }

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