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https://issues.apache.org/jira/browse/HDFS-1257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084424#comment-13084424
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Eric Payne commented on HDFS-1257:
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Again, I just want to point out that the unit tests that are failing were
failing on trunk without this patch.
> Race condition on FSNamesystem#recentInvalidateSets introduced by HADOOP-5124
> -----------------------------------------------------------------------------
>
> Key: HDFS-1257
> URL: https://issues.apache.org/jira/browse/HDFS-1257
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.23.0
> Reporter: Ramkumar Vadali
> Assignee: Eric Payne
> Fix For: 0.23.0
>
> Attachments: HDFS-1257.1.20110810.patch, HDFS-1257.2.20110812.patch,
> HDFS-1257.patch
>
>
> 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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