status 查看系统状态
hbase(main):010:0> status
1 active master, 0 backup masters, 4 servers, 0 dead, 6.5000 average load
version 查看版本号
hbase(main):011:0> version
1.2.0-cdh5.7.2, rUnknown, Fri Jul 22 12:20:40 PDT 2016
table_help 查看提示信息
hbase(main):012:0> table_help
Help for table-reference commands.
You can either create a table via 'create' and then manipulate the table via commands like 'put', 'get', etc.
See the standard help information for how to use each of these commands.
However, as of 0.96, you can also get a reference to a table, on which you can invoke commands.
For instance, you can get create a table and keep around a reference to it via:
hbase> t = create 't', 'cf'
Or, if you have already created the table, you can get a reference to it:
hbase> t = get_table 't'
You can do things like call 'put' on the table:
hbase> t.put 'r', 'cf:q', 'v'
which puts a row 'r' with column family 'cf', qualifier 'q' and value 'v' into table t.
To read the data out, you can scan the table:
hbase> t.scan
which will read all the rows in table 't'.
Essentially, any command that takes a table name can also be done via table reference.
Other commands include things like: get, delete, deleteall,
get_all_columns, get_counter, count, incr. These functions, along with
the standard JRuby object methods are also available via tab completion.
For more information on how to use each of these commands, you can also just type:
hbase> t.help 'scan'
which will output more information on how to use that command.
You can also do general admin actions directly on a table; things like enable, disable,
flush and drop just by typing:
hbase> t.enable
hbase> t.flush
hbase> t.disable
hbase> t.drop
Note that after dropping a table, your reference to it becomes useless and further usage
is undefined (and not recommended).
表的管理
create 创建表
hbase(main):014:0> create 'xt','xcf'
0 row(s) in 2.5340 seconds
=> Hbase::Table - xt
hbase(main):015:0>
list 查看表
hbase(main):015:0> list
TABLE
...
xt
17 row(s) in 0.0200 seconds
=> [..."xt"]
hbase(main):016:0>
describe 表的描述
hbase(main):017:0> describe 'xt'
Table xt is ENABLED
xt
COLUMN FAMILIES DESCRIPTION
{NAME => 'xcf', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'NONE',
TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BLOCKCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}
1 row(s) in 0.0500 seconds
disable 表的禁用
hbase(main):038:0> disable 'xt'
0 row(s) in 8.7530 seconds
drop 表的删除
hbase(main):039:0> drop 'xt'
0 row(s) in 2.3130 seconds
exsits 判断是否存在
hbase(main):040:0> exists 'xt'
Table xt does not exist
0 row(s) in 0.0110 seconds
数据操作
put 增加和修改数据
向指定的列族中插入数据
hbase(main):019:0> put 'xt','1','xcf:col_name1','col_value1'
0 row(s) in 0.0080 seconds
hbase(main):020:0> put 'xt','1','xcf:col_name2','col_value2'
0 row(s) in 0.0050 seconds
get 查询数据
hbase(main):021:0> get 'xt','1'
COLUMN CELL
xcf:col_name1 timestamp=1496997489039, value=col_value1
xcf:col_name2 timestamp=1496997502916, value=col_value2
2 row(s) in 0.0110 seconds
hbase(main):022:0> get 'xt','1',{COLUMN => 'xcf:col_name1'}
COLUMN CELL
xcf:col_name1 timestamp=1496997489039, value=col_value1
1 row(s) in 0.0520 seconds
hbase(main):023:0>
delete 删除数据
hbase(main):023:0> delete 'xt','1','xcf:col_name1'
0 row(s) in 0.0280 seconds
hbase(main):024:0> get 'xt','1'
COLUMN CELL
xcf:col_name2 timestamp=1496997502916, value=col_value2
1 row(s) in 0.0030 seconds
hbase(main):026:0> deleteall 'xt','1'
0 row(s) in 0.0030 seconds
hbase(main):028:0> get 'xt','1'
COLUMN CELL
0 row(s) in 0.0070 seconds
scan 扫描全部数据
hbase(main):029:0> put 'xt','1','xcf:col1','123'
0 row(s) in 0.0230 seconds
hbase(main):030:0> put 'xt','2','xcf:col1','123'
0 row(s) in 0.0040 seconds
hbase(main):031:0> put 'xt','3','xcf:col1','123'
0 row(s) in 0.0040 seconds
hbase(main):032:0> put 'xt','4','xcf:col1','123'
0 row(s) in 0.0040 seconds
hbase(main):033:0> scan 'xt'
ROW COLUMN+CELL
1 column=xcf:col1, timestamp=1496998219258, value=123
2 column=xcf:col1, timestamp=1496998223993, value=123
3 column=xcf:col1, timestamp=1496998227824, value=123
4 column=xcf:col1, timestamp=1496998230678, value=123
4 row(s) in 0.0140 seconds
count 统计表个数
hbase(main):034:0> count 'xt'
4 row(s) in 0.0170 seconds
=> 4
truncate 清空表数据
hbase(main):035:0> truncate 'xt'
Truncating 'xt' table (it may take a while):
- Disabling table...
- Truncating table...
0 row(s) in 104.8850 seconds
hbase(main):036:0> count 'xt'
0 row(s) in 23.6480 seconds
=> 0
hbase(main):037:0>