how to split region in hbase shell?

[Li Li]

I found one of 4 region server is heavy load than other. and I want to
split region manully.

from the web ui
name: vc2.url_db,,1398174763371.35a8599a5eb457b9e0210f86d8b6d19f.
region serverapp-hbase-1:60030
start key
end key \x1F\xFE\x9B\xFA\x95\x91\xB7\xF0\x9FX\x83\xC9\xBFw\xBD\xDE
request 107360630

I want to split this region. I tried
hbase(main):004:0> split 'vc2.url_db'
,'\x1F\xFE\x9B\xFA\x95\x91\xB7\xF0\x9FX\x83\xC9\xBFw\xBD\xDE'
0 row(s) in 0.8130 seconds
but nothing happens.