最近需要升级hadoop,从hadoop-2.2.0升级到hadoop-2.6.0,根据http://hadoop.apache.org/docs/r2.6.0/hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html#dfsadmin_-rollingUpgrade 提示的来,第一步:./bin/hdfs dfsadmin -rollingUPgrade prepare 就出现了:PREPARE rolling upgrade ...
rollingUpgrade: Unknown method rollingUpgrade called on org.apache.hadoop.hdfs.protocol.ClientProtocol protocol.
求教,hadoop-2.2.0升级hadoop-2.6.0。
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