hadoop/hadoop-hdfs-project/hadoop-hdfs/CHANGES_HDFS-5535.txt

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HDFS-5535 subtasks:
HDFS-5496. Make replication queue initialization asynchronous. (Vinay via
jing9)
HDFS-5645. Support upgrade marker in editlog streams. (szetszwo)
HDFS-5752. Add a new DFSAdmin command to query, start and finalize rolling
upgrade. (szetszwo)
HDFS-5786. Support QUERY and FINALIZE actions of rolling upgrade. (szetszwo)
HDFS-5753. Add new Namenode startup options for downgrade and rollback using
upgrade marker. (szetszwo)
HDFS-5835. Add a new option for starting Namenode when rolling upgrade is
in progress. (szetszwo)
HDFS-5754. Split LayoutVerion into NameNodeLayoutVersion and
DataNodeLayoutVersion. (Brandon Li via szetszwo)
HDFS-5848. Add rolling upgrade status to heartbeat response. (szetszwo)
HDFS-5890. Avoid NPE in Datanode heartbeat. (Vinay via brandonli)