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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