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From "Ramkumar Vadali (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1257) Race condition introduced by HADOOP-5124
Date Tue, 22 Jun 2010 18:35:57 GMT
Race condition introduced by HADOOP-5124
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                 Key: HDFS-1257
                 URL: https://issues.apache.org/jira/browse/HDFS-1257
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
            Reporter: Ramkumar Vadali


HADOOP-5124 provided some improvements to FSNamesystem#recentInvalidateSets. But it introduced
unprotected access to the data structure recentInvalidateSets. Specifically, FSNamesystem.computeInvalidateWork
accesses recentInvalidateSets without read-lock protection. If there is concurrent activity
(like reducing replication on a file) that adds to recentInvalidateSets, the name-node crashes
with a ConcurrentModificationException.

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