Hbase shell常用命令小记

hbase.png
1、进入hbase shell console
$HBASE_HOME/bin/hbase shell
如果有kerberos认证,需要事先使用相应的keytab进行一下认证(使用kinit命令),认证成功之后再使用hbase shell进入可以使用whoami命令可查看当前用户
hbase(main):002:0> whoami
2016-09-12 13:09:42,440 WARN [main] util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
root (auth:SIMPLE)
groups: root

 2、表的管理
1)查看有哪些表
hbase(main):001:0> list
TABLE
pythonTrace
1 row(s) in 0.1320 seconds
2)创建表
语法:create <table>, {NAME => <family>, VERSIONS => <VERSIONS>}
例如:创建表t1,有两个family name:f1,f2,且版本数均为2
hbase(main):001:0> create 't1',{NAME => 'f1', VERSIONS => 2},{NAME => 'f2', VERSIONS => 2}
0 row(s) in 0.4400 seconds

=> Hbase::Table - t1
3)删除表
分两步:首先disable,然后drop ;  例如:删除表t1
hbase(main):002:0> disable 't1'
0 row(s) in 1.2030 seconds

hbase(main):003:0> drop 't1'
0 row(s) in 0.1870 seconds
4)查看表的结构
语法:describe <table> ,  例如:查看表t1的结构
hbase(main):005:0> describe 't1'
Table t1 is ENABLED
t1
COLUMN FAMILIES DESCRIPTION
{NAME => 'f1', DATA_BLOCK_ENCODING => 'NONE', BLOOMFILTER => 'ROW', REPLICATION_SCOPE => '0', VERSIONS => '2', COMP
RESSION => 'NONE', MIN_VERSIONS => '0', TTL => 'FOREVER', KEEP_DELETED_CELLS => 'FALSE', BLOCKSIZE => '65536', IN_M
EMORY => 'false', BLOCKCACHE => 'true'}
{NAME => 'f2', DATA_BLOCK_ENCODING => 'NONE', BLOOMFILTER => 'ROW', REPLICATION_SCOPE => '0', VERSIONS => '2', COMP
RESSION => 'NONE', MIN_VERSIONS => '0', TTL => 'FOREVER', KEEP_DELETED_CELLS => 'FALSE', BLOCKSIZE => '65536', IN_M
EMORY => 'false', BLOCKCACHE => 'true'}
2 row(s) in 0.0240 seconds
5)修改表结构
修改表结构必须先disable
语法:alter 't1', {NAME => 'f1'}, {NAME => 'f2', METHOD => 'delete'}; 例如:修改表t1的cf的TTL为180天
hbase(main):006:0> disable 't1'
0 row(s) in 1.1950 seconds

hbase(main):007:0> alter 't1',{NAME=>'body',TTL=>'15552000'},{NAME=>'meta', TTL=>'15552000'}
Updating all regions with the new schema...
1/1 regions updated.
Done.
Updating all regions with the new schema...
1/1 regions updated.
Done.
0 row(s) in 2.1910 seconds

hbase(main):008:0> enable 't1'
0 row(s) in 0.3930 seconds

3、权限管理
1)分配权限
语法 : grant <user> <permissions> <table> <column family> <column qualifier> 参数后面用逗号分隔
权限用五个字母表示: "RWXCA"; READ('R'), WRITE('W'), EXEC('X'), CREATE('C'), ADMIN('A')
例如,给用户‘test'分配对表t1有读写的权限
hbase(main)> grant 'test','RW','t1'
2)查看权限
语法:user_permission <table> ; 例如,查看表t1的权限列表
hbase(main)> user_permission 't1'
3)收回权限
与分配权限类似,语法:revoke <user> <table> <column family> <column qualifier>
例如,收回test用户在表t1上的权限
hbase(main)> revoke 'test','t1'

4、表数据的增删改查
1)添加数据
语法:put <table>,<rowkey>,<family:column>,<value>,<timestamp>
例如:给表t1的添加一行记录:rowkey是rowkey001,family name:f1,column name:col1,value:value01,timestamp:系统默认
hbase(main)> put 't1','rowkey001','f1:col1','value01'
用法比较单一
2)查询数据
a)查询某行记录
语法:get <table>,<rowkey>,[<family:column>,....]   ;例如:查询表t1,rowkey001中的f1下的col1的值
hbase(main)> get 't1','rowkey001', 'f1:col1'
# 或者:
hbase(main)> get 't1','rowkey001', {COLUMN=>'f1:col1'}
查询表t1,rowke002中的f1下的所有列值
hbase(main)> get 't1','rowkey001'
b)扫描表
语法:scan <table>, {COLUMNS => [ <family:column>,.... ], LIMIT => num}
另外,还可以添加STARTROW、TIMERANGE和FITLER等高级功能; 例如:扫描表t1的前5条数据
hbase(main)> scan 't1',{LIMIT=>5}
c)查询表中的数据行数
语法:count <table>, {INTERVAL => intervalNum, CACHE => cacheNum}
INTERVAL设置多少行显示一次及对应的rowkey,默认1000;CACHE每次去取的缓存区大小,默认是10,调整该参数可提高查询速度
例如,查询表t1中的行数,每100条显示一次,缓存区为500
hbase(main)> count 't1', {INTERVAL => 100, CACHE => 500}
3)删除数据
a )删除行中的某个列值
语法:delete <table>, <rowkey>,  <family:column> , <timestamp>,必须指定列名
例如:删除表t1,rowkey001中的f1:col1的数据
hbase(main)> delete 't1','rowkey001','f1:col1'
注:将删除改行f1:col1列所有版本的数据
 
b )删除行
语法:deleteall <table>, <rowkey>,  <family:column> , <timestamp>,可以不指定列名,删除整行数据
例如:删除表t1,rowk001的数据
hbase(main)> deleteall 't1','rowkey001'
c)删除表中的所有数据
语法: truncate <table>
其具体过程是:disable table -> drop table -> create table ;例如:删除表t1的所有数据
hbase(main)> truncate 't1'

5、Region管理
1)移动region
语法:move 'encodeRegionName', 'ServerName'
encodeRegionName指的regioName后面的编码,ServerName指的是master-status的Region Servers列表
示例如下:
hbase(main)>move '4343995a58be8e5bbc739af1e91cd72d', 'db-41.xxx.xxx.org,60020,1390274516739'
2)开启/关闭region
语法:balance_switch true|false
hbase(main)> balance_switch
3)手动split
语法:split 'regionName', 'splitKey'
4)手动触发major compaction
#语法:
#Compact all regions in a table:
hbase> major_compact 't1'
#Compact an entire region:
hbase> major_compact 'r1'
#Compact a single column family within a region:
hbase> major_compact 'r1', 'c1'
#Compact a single column family within a table:
hbase> major_compact 't1', 'c1'

6、配置管理及节点重启
1)修改hdfs配置
hdfs配置位置:/etc/hadoop/conf
# 同步hdfs配置
cat /home/hadoop/slaves|xargs -i -t scp /etc/hadoop/conf/hdfs-site.xml hadoop@{}:/etc/hadoop/conf/hdfs-site.xml
# 关闭:
cat /home/hadoop/slaves|xargs -i -t ssh hadoop@{} "sudo /home/hadoop/cdh4/hadoop-2.0.0-cdh4.2.1/sbin/hadoop-daemon.sh --config /etc/hadoop/conf stop datanode"
# 启动:
cat /home/hadoop/slaves|xargs -i -t ssh hadoop@{} "sudo /home/hadoop/cdh4/hadoop-2.0.0-cdh4.2.1/sbin/hadoop-daemon.sh --config /etc/hadoop/conf start datanode"
2)修改hbase配置
hbase配置位置:
# 同步hbase配置
cat /home/hadoop/hbase/conf/regionservers|xargs -i -t scp /home/hadoop/hbase/conf/hbase-site.xml hadoop@{}:/home/hadoop/hbase/conf/hbase-site.xml
# graceful重启
cd ~/hbase
bin/graceful_stop.sh --restart --reload --debug inspurXXX.xxx.xxx.org

0 个评论

要回复文章请先登录注册