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  1. Hadoop HDFS
  2. HDFS-5535 Umbrella jira for improved HDFS rolling upgrades
  3. HDFS-6034

DN registration should use DataNodeLayoutVersion instead of NameNodeLayoutVersion

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      Currently the registrationID is in the form of BlockPoolID-NNLayoutVersion. When the NN bumps the layout version during rolling upgrade, the DNs will fail to register with the new NN and exit, regardless whether the new software version is used.

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            szetszwo Tsz-wo Sze Assign to me
            wheat9 Haohui Mai
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