[Hadoop Jps] namenode, datanode가 실행되지 않는다면?

1. 마스터에서 namenode가 실행되지않음: hdfs 초기화 진행 -> hdfs namenode -format

2. 슬레이브에서 datanode가 실행되지않음: hdfs-site.xml에 datanode 파일 경로 설정

 

<configuration>
    <property>
        <name>dfs.namenode.name.dir</name>
         <value>file:///Users/jiwonwee/SPARK_BOOK/hadoop/hadoop-2.7.0/data/namenode</value>
    </property>
    <property>
        <name>dfs.datanode.data.dir</name>
         <value>file:///Users/jiwonwee/SPARK_BOOK/hadoop/hadoop-2.7.0/data/datanode</value>
    </property>
    <property>
         <name>dfs.namenode.checkpoint.dir</name>
         <value>file:///Users/jiwonwee/SPARK_BOOK/hadoop/hadoop-2.7.0/data/namesecondary</value>
    </property>
    <property>
        <name>dfs.replication</name>
         <value>3</value>
    </property>
</configuration>