root@ubuntu:/opt/hadoop-1.2.1/bin# hadoop namenode -formatWarning: $HADOOP_HOME is deprecated.Error: Config file not found: /usr/lib/jvm/java-9-openjdk-amd64/conf/management/management.properties自己安裝的Oracle JDK,不是跟教程安裝的openJDK,在/usr/local/路徑下
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