1. specifying string literals

hbase(main):019:0> create 't4','f1',SPLITS=>['10','20','30']
Created table t4
Took 2.3882 seconds  

image-20200630152538595.png

2. from a file corresponding to the local path on the local filesystem

# Each line in the file specifies a split point key.
[root@host-10-1-236-145 hbase_test]# cat splits.txt 
10
20
30

hbase(main):021:0> create 't5','f1',SPLITS_FILE=>'/root/jiazz/hbase_test/splits.txt'
Created table t5
Took 1.5613 seconds                                                                                                                                                                                          
=> Hbase::Table - t5

3. splits based on a desired number of regions and a splitting algorithm

hbase(main):039:0> create 't2','f1', { NUMREGIONS => 4 , SPLITALGO => 'UniformSplit' }
Created table t2
Took 2.2856 seconds                                                                                                                                                                                          
=> Hbase::Table - t2

image-20200630153243626.png

hbase(main):040:0> create 't3','f1', { NUMREGIONS => 5, SPLITALGO => 'HexStringSplit' }
Created table t3
Took 2.3487 seconds                                                                                                                                                                                          
=> Hbase::Table - t3

image-20200630153356604.png

4. simple Ruby scripts to compute splits algorithmically

hbase(main):049:0> def gen_splits(start_key,end_key,num_regions)
hbase(main):050:1>  results=[]
hbase(main):051:1>  range=end_key-start_key
hbase(main):052:1>  incr=(range/num_regions).floor
hbase(main):054:1>  for i in 1 .. num_regions-1
hbase(main):055:2>   results.push([i*incr+start_key].pack("N"))
hbase(main):056:2>  end
hbase(main):057:1>  return results
hbase(main):058:1> end
=> :gen_splits
hbase(main):059:0> splits=gen_splits(1,2000000,10)
=> ["\x00\x03\r@", "\x00\x06\x1A\x7F", "\x00\t'\xBE", "\x00\f4\xFD", "\x00\x0FB<", "\x00\x12O{", "\x00\x15\\\xBA", "\x00\x18i\xF9", "\x00\ew8"]
hbase(main):060:0> create 'test_splits','f',SPLITS=>splits
Created table test_splits
Took 2.3220 seconds                                                                                                                                                                                          
=> Hbase::Table - test_splits
hbase(main):061:0> 

image-20200630154151420.png