Allow HDFS DataNodes and NameNode to have different build versions
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Key: HDFS-1129
URL: https://issues.apache.org/jira/browse/HDFS-1129
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: dhruba borthakur
There are times when we want to deploy fixes to the NameNode without restarting
the DataNodes. This reduces the restart time of the entire cluster.
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