【hadoop 2.7.1 】动态添加节点、删除节点
SharonHarde
8年前
来自: http://my.oschina.net/u/204498/blog/611104
hftest0001
hftest0002
hftest0003
一、动态添加节点
hftest0001 (master node )
[hadoop@hftest0001 hadoop]$ pwd /home/hadoop/hadoop-2.7.1/etc/hadoop [hadoop@hftest0001 hadoop]$ cat masters hftest0001.webex.com [hadoop@hftest0001 hadoop]$ cat slaves hftest0002.webex.com [hadoop@hftest0001 hadoop]$ cat hdfs-site.xml <configuration> <property> <name>dfs.replication</name> <value>1</value> </property> ... ... <configuration>
hftest0002 (data node)
[hadoop@hftest0002 hadoop]$ pwd /home/hadoop/hadoop-2.7.1/etc/hadoop [hadoop@hftest0002 hadoop]$ cat masters hftest0001.webex.com [hadoop@hftest0002 hadoop]$ cat slaves hftest0002.webex.com [hadoop@hftest0002 hadoop]$ cat hdfs-site.xml <configuration> <property> <name>dfs.replication</name> <value>1</value> </property> ... ... <configuration>
[hadoop@hftest0001 hadoop-2.7.1]$ ./bin/hdfs dfs -ls /tmp Found 1 items -rw-r--r-- 1 hadoop supergroup 1366 2016-01-28 13:48 /tmp/README.txt ===> replication 1
准备:
创建新节点hftest0003
修改hostname(/etc/sysconf/network) 和 hosts(/etc/hosts) 使得集群相互ping通
修改slaves文件,添加新节点
修改replication=>2
[hadoop@hftest0001 hadoop]$ pwd /home/hadoop/hadoop-2.7.1/etc/hadoop [hadoop@hftest0003 hadoop]$ cat masters hftest0001.webex.com [hadoop@hftest0003 hadoop]$ cat slaves hftest0002.webex.com hftest0003.webex.com [hadoop@hftest0003 hadoop]$ cat hdfs-site.xml <configuration> <property> <name>dfs.replication</name> <value>2</value> </property> ... ... <configuration>
注意:所有的集群全部需要修改
[hadoop@hftest0001 hadoop-2.7.1]$ pwd /home/hadoop/hadoop-2.7.1 启动datanode [hadoop@hftest0001 hadoop-2.7.1]$ ./sbin/hadoop-daemon.sh start datanode ... ... webui可以校验 [hadoop@hftest0001 hadoop-2.7.1]$ ./sbin/start-balancer.sh -threshold 5 启动nodemanager [hadoop@hftest0001 hadoop-2.7.1]$ ./sbin/yarn-daemon.sh start nodemanager ... ... [hadoop@hftest0001 hadoop-2.7.1]$ ./bin/hdfs dfs -ls /tmp Found 2 items -rw-r--r-- 2 hadoop supergroup 101 2016-01-28 13:54 /tmp/NOTICE.txt ====> replication=2 -rw-r--r-- 1 hadoop supergroup 1366 2016-01-28 13:48 /tmp/README.txt
二、删除节点