add/delete node(hadoop)

  1. 无论是在Hadoop集群中添加机器和删除机器，都无需停机，整个服务不中断。
  2. master/conf/slaves 添加 newnodename
  3. master start-all.sh

safe mode when delete node:

  1. 创建 master/conf/nn-excluded-list
  2. 添加 deletednodename
  3. 修改 master/conf/hdfs-site.xml

    <property>

    <name>dfs.hosts.exclude</name>

    <value>conf/nn-excluded-list</value>

    </property>

  4. master:  $HADOOP_HOME/bin/hadoop dfsadmin -refreshNodes
  5. HDFS Cluster  : hp3机器已经处于Decommission In Progress状态 ； MR 可能还在 in service
  6. 等待hp3中datanode的Decommission操作完成以后，再到hp3机器中关闭所有的Hadoop进程。
时间： 2024-08-30 02:28:15

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