一.HDFS动态增加节点：
sbin/hadoop-daemon.sh start datanode
sbin/hadoop-daemon.sh start tasktracker
DEPRECATED: Use of this script to execute mapred command is deprecated.
Instead use the mapred command for it.
Sorry, the tasktracker command is no longer supported.
You may find similar functionality with the "yarn" shell command.
Usage: mapred [--config confdir] [--loglevel loglevel] COMMAND
where COMMAND is one of:
pipes run a Pipes job
job manipulate MapReduce jobs
queue get information regarding JobQueues
(1)启动datanode进程
sbin/hadoop-daemon.sh start datanode
(2)启动nodemanager进程
sbin/yarn-daemon.sh start nodemanager
(3)均衡block
sbin/start-balancer.sh
1.问题：yarn
http://192.168.13.129:8088/cluster/nodes/?node.label=
两次出现新增的节点，节点重复，过一会儿会消失
二.hbase增加Region Servers
(1)
HMaster节点的配置regionservers
[root@node01 hbase-1.3.0]# cat conf/regionservers
node02
node03
node04
(2)
在新节点中通过下面命令启动HRegionServer:
hbase-daemon.sh start regionserver
(3)验证HRegionServer：
[root@node04 hadoop-2.7.3]# jps
3890 DataNode
4615 Jps
3975 NodeManager
4456 HRegionServer
1913 QuorumPeerMain
三.hbase删除Region Servers
hbase-daemon.sh stop regionserver
(1)
在需要删除的RegionServer上执行以下命令：$ ./bin/hbase-daemon.sh stop regionserver RegionServer将会关掉所有的region，然后此节点将会在Zookeeper消失。Master注意到了此RegionServer 掉了，它将会重新分配掉的这些Region。在停掉一个节点的时候，注意要关闭Load Balancer，因为Load Balancer可能要和Master的恢复机制争夺停掉的RegionServer
(2)
hbase(main):001:0> balance_switch false
true
(3)
graceful_stop.sh node04
Valid region move targets:
node03,16020,1491575709589
node02,16020,1491575710085
2017-04-08T00:42:10 Unloaded node04 region(s)
2017-04-08T00:42:10 Stopping regionserver on node04
stopping regionserver.........
(4)
[root@node04 hadoop-2.7.3]# hbase-daemon.sh stop regionserver
no regionserver to stop because no pid file /tmp/hbase-root-regionserver.pi
(5)
hbase(main):001:0> balance_switch true
四.HDFS移除节点：
(1)添加黑名单文件
在主节点的Hadoop安装目录目录下添加文件excludes
和slaves类似每个节点名一行 添加上要移除的节点名node04
例如：
echo 'node04' > excludes
[root@node01 hadoop-2.7.3]# cat /app/hadoop-2.7.3/excludes
node04
(2)修改hdfs-site.xml
添加下列代码，路径为自己的excludes文件路径
<property>
<name>dfs.hosts.exclude</name>
<value>/app/hadoop-2.7.3/excludes</value>
</property>
(3)修改mapred-site.xml
添加下列代码，路径为自己的excludes文件路径
<property>
<name>mapred.hosts.exclude</name>
<value>/app/hadoop-2.7.3/excludes</value>
</property>
(4)刷新
在主节点hadoop安装目录下执行下面命令
hadoop dfsadmin -refreshNodes
(5)在web上查看节点效果
node04:50010 (192.168.13.131:50010) 0Decommission In Progress 7.6 GB
一开始是Decommission In Progress，正在退役
node04:50010 (192.168.13.131:50010) 1Decommissioned 7.6 GB
执行完后状态修改为Decommissioned，表示已退役
(6)slaves删除node04
[root@node01 hadoop-2.7.3]# cat /app/hadoop-2.7.3/etc/hadoop/slaves
node02
node03
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