hadoop升级

首先停机，更新namenode,datanode上hadoop，然后

namenode节点上进行:

915 hadoop namenode -upgrade
916 hadoop namenode -rollback
917 hadoop namenode -upgrade
918 hadoop dfsadmin -finalizeUpgrade
919 hadoop namenode -upgrade

914 hadoop dfsadmin -upgradeProgress status

datanode上进行:

396 hadoop datanode -upgrade
397 hadoop datanode -rollback
398 hadoop datanode -upgrade
399 hadoop DataNode -upgrade
400 hadoop datanode -upgrade
401 tail -f /opt/modules/hadoop/logs/hadoop-root-datanode-data-test-209.log
402 hadoop datanode -upgrade
403 hadoop datanode -rollback
404 hadoop datanode -finalized