【HBase】表的version
建表、添加数据
Examples:
hbase> create 'ns1:t1', 'f1', SPLITS => ['10', '20', '30', '40']
hbase> create 't1', 'f1', SPLITS => ['10', '20', '30', '40']
hbase> create 't1', 'f1', SPLITS_FILE => 'splits.txt', OWNER => 'johndoe'
hbase> create 't1', {NAME => 'f1', VERSIONS => 5}, METADATA => { 'mykey' => 'myvalue' }
hbase> # Optionally pre-split the table into NUMREGIONS, using
hbase> # SPLITALGO ("HexStringSplit", "UniformSplit" or classname)
hbase> create 't1', 'f1', {NUMREGIONS => 15, SPLITALGO => 'HexStringSplit'}
hbase> create 't1', 'f1', {NUMREGIONS => 15, SPLITALGO => 'HexStringSplit', REGION_REPLICATION => 2, CONFIGURATION => {'hbase.hregion.scan.loadColumnFamiliesOnDemand' => 'true'}}
hbase> create 't1', {NAME => 'f1', DFS_REPLICATION => 1}
You can also keep around a reference to the created table:
hbase> t1 = create 't1', 'f1'
Which gives you a reference to the table named 't1', on which you can then
call methods.
hbase(main):003:0> create 'lzl', 'info', SPLITS => ['10', '20', '30', '40']
0 row(s) in 2.4090 seconds
=> Hbase::Table - lzl
hbase(main):004:0> put 'lzl','01','info:name','lzl'
0 row(s) in 0.3180 seconds
hbase(main):005:0> put 'lzl','11','info:name','lzl2'
0 row(s) in 0.0250 seconds
hbase(main):006:0> put 'lzl','31','info:name','lzl3'
0 row(s) in 0.0530 seconds
查看版本VERSION => 1
hbase(main):007:0> describe 'lzl'
Table lzl is ENABLED
lzl
COLUMN FAMILIES DESCRIPTION
{NAME => 'info', 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 0.0690 seconds
hbase(main):008:0>
新增VERSION => 3
hbase(main):008:0> alter 'lzl' ,{NAME=>'info', VERSIONS=>3}
Updating all regions with the new schema...
0/5 regions updated.
5/5 regions updated.
Done.
0 row(s) in 3.3500 seconds
hbase(main):009:0>
修改数据
hbase(main):009:0> put 'lzl','01','info:name','hhh'
0 row(s) in 0.0300 seconds
hbase(main):010:0> scan 'lzl'
ROW COLUMN+CELL
01 column=info:name, timestamp=1570830343144, value=hhh
11 column=info:name, timestamp=1570829294234, value=lzl2
31 column=info:name, timestamp=1570829314499, value=lzl3
3 row(s) in 0.1660 seconds
hbase(main):011:0>
查看VERSION => 3数据
hbase(main):019:0> scan 'lzl',{VERSIONS => 1}
ROW COLUMN+CELL
01 column=info:name, timestamp=1570830343144, value=hhh
11 column=info:name, timestamp=1570829294234, value=lzl2
31 column=info:name, timestamp=1570829314499, value=lzl3
3 row(s) in 0.0660 seconds
hbase(main):020:0> put 'lzl','01','info:name','zzz'
0 row(s) in 0.0180 seconds
hbase(main):021:0> scan 'lzl',{VERSIONS => 3}
ROW COLUMN+CELL
01 column=info:name, timestamp=1570830773469, value=zzz
01 column=info:name, timestamp=1570830343144, value=hhh
01 column=info:name, timestamp=1570829280377, value=lzl
11 column=info:name, timestamp=1570829294234, value=lzl2
31 column=info:name, timestamp=1570829314499, value=lzl3
3 row(s) in 0.0620 seconds
hbase(main):022:0>
HBase会存储最近的3个VERSION
hbase> create ‘ns1:t1’, ‘f1’, SPLITS => [‘10’, ‘20’, ‘30’, ‘40’]
按rowkey切分建表， [‘10’, ‘20’, ‘30’, ‘40’]会有5个region
region均匀分配在regionserver中
Victory！
