Hbase Shell的常用命令

总结的一些Hbase shell的命令

都很简单，可以help来查看帮助

create 'user_test','info'
describe 'user_test'
disable 'user_testinfo'
drop 'user_testinfo'
put 'user_test','test-1','info:username','test1'
put 'user_test','test-1','info','1'
put 'user_test','test-2','info:creattime','20101116'
list
scan 'user_test'
#可以指定startrow,stoprow来scan多个row
scan 'user_test',{COLUMNS =>'info:username',LIMIT =>10, STARTROW => 'test',STOPROW=>'test2'}
get 'user_test','test-1'
get 'user_test','test-1',{COLUMN => 'info:username'}
#删除某行的某一列，比如username那列的值
delete 'user_test','test-1','info:username'
#删除某行所有的列
deleteall 'user_test','test-2'     
count 'user_test'
status 'detailed'

 

 

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基于现有的Hadoop集群，来搭建Hbase的环境

整个过程还是比较简单的

1. 下载Hbase源码，并解压

cp hbase-0.20.6.tar.gz /opt/hadoop/
cd /opt/hadoop/
tar zxvf hbase-0.20.6.tar.gz
ln -s hbase-0.20.6 hbase

2.修改hbase-env.sh，加入java环境，并修改log位置

export JAVA_HOME=/opt/java/jdk
export HBASE_LOG_DIR=/opt/log/hbase
export HBASE_MANAGES_ZK=true

3. 修改hbase-site.xml，配置hbase

<property>
    <name>hbase.rootdir</name>
    <value>hdfs://zw-hadoop-master:9000/hbase</value>
    <description>The directory shared by region servers.</description>
</property>
<property>
            <name>hbase.cluster.distributed</name>
            <value>true</value>
            <description>The mode the cluster will be in. Possible values are
              false: standalone and pseudo-distributed setups with managed Zookeeper
              true: fully-distributed with unmanaged Zookeeper Quorum (see hbase-env.sh)
            </description>
    </property>
<property> 
    <name>hbase.master</name> 
    <value>hdfs://zw-hadoop-master:60000</value> 
</property>
<property>
    <name>hbase.zookeeper.quorum</name>       
    <value>zw-hadoop-slave225,zw-hadoop-slave226,zw-hadoop-slave227</value>
    <description>Comma separated list of servers in the ZooKeeper Quorum.      For example, "host1.mydomain.com,host2.mydomain.com,host3.mydomain.com".      By default this is set to localhost for local and pseudo-distributed modes      of operation. For a fully-distributed setup, this should be set to a full      list of ZooKeeper quorum servers. If HBASE_MANAGES_ZK is set in hbase-env.sh      this is the list of servers which we will start/stop ZooKeeper on.     
    </description>
</property>
<property>
    <name>hbase.zookeeper.property.dataDir</name>
    <value>/opt/log/zookeeper</value>
    <description>Property from ZooKeeper's config zoo.cfg.
        The directory where the snapshot is stored.
    </description>
</property>

几个配置的说明：

• hbase.rootdir设置hbase在hdfs上的目录，主机名为hdfs的namenode节点所在的主机
• hbase.cluster.distributed设置为true，表明是完全分布式的hbase集群
• hbase.master设置hbase的master主机名和端口
• hbase.zookeeper.quorum设置zookeeper的主机，官方推荐设置为3，5，7比较好

4. 编辑regionservers文件，设置regionservers的服务器，和hadoop的slaves一样即可

5. 启动Hbase

/opt/sohuhadoop/hbase/bin/start-hbase.sh
/opt/sohuhadoop/hbase/bin/stop-hbase.sh

Hbase默认只有一个Master，我们可以也启动多个Master：

/opt/sohuhadoop/hbase/bin/hbase-daemon.sh start master

不过，其它的Master并不会工作，只有当主Master down掉后

其它的Master才会选择接管Master的工作

Hbase也有一个简单的web界面，来查看其状态

http://10.10.71.1:60010/master.jsp
http://10.10.71.1:60030/regionserver.jsp

http://10.10.71.1:60010/zk.jsp