以下案例建表并设置预分区,分别测试以下2种方法
1.固定散列
示例:rowkey以日期为前缀
create 'test','cf1', SPLITS => '202401', '202402', '202403'
put 'test','20240101','cf1:name','20240101'
put 'test','20240102','cf1:name','20240102'
put 'test','20240103','cf1:name','20240103'
put 'test','20240201','cf1:name','20240201'
put 'test','20240202','cf1:name','20240202'
put 'test','20240203','cf1:name','20240203'
put 'test','20240301','cf1:name','20240301'
put 'test','20240302','cf1:name','20240302'
put 'test','20240303','cf1:name','20240303'
put 'test','20240304','cf1:name','20240304'
都分发到对应的region
Table Regions
Name Region Server Start Key End Key Locality Requests
test,1714377792028.5582f2cefddffb29a9cb8a47b404df63. whtpiodscshd02t,21302,1710927704067 202401 0.0 0
test,202401,1714377792028.fc66ef2c38740a635f5cea810d7f4d8d. whtpiodscshd01t,21302,1710927618816 202401 202402 0.0 3
test,202402,1714377792028.e72ba47f141297e012ab350cba56ad5c. whtpiodscshd03t,21302,1710927771892 202402 202403 0.0 3
test,202403,1714377792028.cd19ee74662ef8ba393464da96213aba. whtpiodscshd02t,21302,1710927704067 202403 0.0 4
2.哈希散列
Hbase自带了两种pre-split的算法,分别是HexStringSplit和UniformSplit
1.HexStringSplit算法
示例1:
create 'test2', {NAME => 'cf1'},{NUMREGIONS => 4, SPLITALGO => 'HexStringSplit'}
put 'test2','20240101','cf1:name','20240101'
put 'test2','20240102','cf1:name','20240102'
put 'test2','20240103','cf1:name','20240103'
put 'test2','20240201','cf1:name','20240201'
put 'test2','20240202','cf1:name','20240202'
put 'test2','20240203','cf1:name','20240203'
put 'test2','20240301','cf1:name','20240301'
put 'test2','20240302','cf1:name','20240302'
put 'test2','20240303','cf1:name','20240303'
put 'test2','20240304','cf1:name','20240304'
Table Regions
Name Region Server Start Key End Key Locality Requests
test2,1714382074838.ad061d93d07dea90c587ce00e5ad56c0. whtpiodscshd03t,21302,1710927771892 40000000 0.0 10
test2,40000000,1714382074838.c803b1e07c2390095f67041d16771906. whtpiodscshd01t,21302,1710927618816 40000000 80000000 0.0 0
test2,80000000,1714382074838.c17c9a422fece545f968b4652a8d049a. whtpiodscshd02t,21302,1710927704067 80000000 c0000000 0.0 0
test2,c0000000,1714382074838.77e83f95f8fa8dc42210a666dc76f126. whtpiodscshd01t,21302,1710927618816 c0000000 0.0 0
2.UniformSplit算法
示例2:
create 'test3', {NAME => 'cf1'},{NUMREGIONS => 4, SPLITALGO => 'UniformSplit'}
put 'test3','acdzdf4ae5rew','cf1:name','acdzdf4ae5rew'
put 'test3','acdzdfaczerew','cf1:name','acdzdfaczerew'
put 'test3','edddddddddfdd','cf1:name','edddddddddfdd'
put 'test3','acdzdfacaerew','cf1:name','acdzdfacaerew'
put 'test3','acdzd12344rew','cf1:name','acdzd12344rew'
put 'test3','acdzd44caerew','cf1:name','acdzd44caerew'
put 'test3','acdzdfa123rew','cf1:name','acdzdfa123rew'
put 'test3','acdzdfaxaerew','cf1:name','acdzdfaxaerew'
put 'test3','acdzdfadfcrew','cf1:name','acdzdfadfcrew'
put 'test3','acdzdfac1erew','cf1:name','acdzdfac1erew'
Table Regions
Name Region Server Start Key End Key Locality Requests
test3,1714382196221.51c3306c9ef13a9251fb0b184c077711. whtpiodscshd02t,21302,1710927704067 @\x00\x00\x00\x00\x00\x00\x00 0.0 10
test3,@\x00\x00\x00\x00\x00\x00\x00,1714382196221.17b5d102fee381c30255e51692b3050d. whtpiodscshd01t,21302,1710927618816 @\x00\x00\x00\x00\x00\x00\x00 \x80\x00\x00\x00\x00\x00\x00\x00 0.0 10
test3,\x80\x00\x00\x00\x00\x00\x00\x00,1714382196221.4348f72d52953c670f0cfb90a329ad2b. whtpiodscshd03t,21302,1710927771892 \x80\x00\x00\x00\x00\x00\x00\x00 \xC0\x00\x00\x00\x00\x00\x00\x00 0.0 0
test3,\xC0\x00\x00\x00\x00\x00\x00\x00,1714382196221.50b797c3caaf12d54068e323e8e65ba4. whtpiodscshd01t,21302,1710927618816 \xC0\x00\x00\x00\x00\x00\x00\x00 0.0 0