Jing Zhao
470d4253b2
HDFS-5920. Support rollback of rolling upgrade in NameNode and JournalNodes. Contributed by Jing Zhao.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-5535@1568563 13f79535-47bb-0310-9956-ffa450edef68
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