<property>
  <name>hbase.regionserver.region.split.policy</name>
  <value>org.apache.hadoop.hbase.regionserver.SteppingSplitPolicy</value>
</property>

HTableDescriptor tableDesc = new HTableDescriptor("test");
tableDesc.setValue(HTableDescriptor.SPLIT_POLICY, ConstantSizeRegionSplitPolicy.class.getName());
tableDesc.addFamily(new HColumnDescriptor(Bytes.toBytes("cf1")));
admin.createTable(tableDesc);

# old
hbase> create 'blog', {METADATA => {'SPLIT_POLICY' => 'org.apache.hadoop.hbase.regionserver.ConstantSizeRegionSplitPolicy'}},{NAME => 'cf'}

# new
hbase> create 'blog',{CONFIGURATION => {'hbase.regionserver.region.split_restriction.type' => 'KeyPrefix','hbase.regionserver.region.split_restriction.prefix_length' => '1'}},{NAME=>'cf'}

/**
 * A custom RegionSplitPolicy implementing a SplitPolicy that groups
 * rows by a prefix of the row-key
 *
 * This ensures that a region is not split "inside" a prefix of a row key.
 * I.e. rows can be co-located in a region by their prefix.
 *
 * @deprecated since 2.4.3 and will be removed in 4.0.0. Use {@link RegionSplitRestriction},
 *   instead.
 */
@Deprecated
@InterfaceAudience.Private
public class KeyPrefixRegionSplitPolicy extends IncreasingToUpperBoundRegionSplitPolicy {
  // some code
}

/**
 * A split restriction that restricts the pattern of the split point.
 * <p>
 * The difference between {@link RegionSplitPolicy} and RegionSplitRestriction is that
 * RegionSplitRestriction defines how to split while {@link RegionSplitPolicy} defines when we need
 * to split.
 * <p>
 * We can specify a split restriction, "KeyPrefix" or "DelimitedKeyPrefix", to a table with the
 * "hbase.regionserver.region.split_restriction.type" property. The "KeyPrefix" split restriction
 * groups rows by a prefix of the row-key. And the "DelimitedKeyPrefix" split restriction groups
 * rows by a prefix of the row-key with a delimiter.
 *
 * For example:
 * <pre>
 * <code>
 * # Create a table with a "KeyPrefix" split restriction, where the prefix length is 2 bytes
 * hbase> create 'tbl1', 'fam',
 *   {CONFIGURATION => {'hbase.regionserver.region.split_restriction.type' => 'KeyPrefix',
 *                      'hbase.regionserver.region.split_restriction.prefix_length' => '2'}}
 *
 * # Create a table with a "DelimitedKeyPrefix" split restriction, where the delimiter is a comma
 * hbase> create 'tbl2', 'fam',
 *   {CONFIGURATION => {'hbase.regionserver.region.split_restriction.type' => 'DelimitedKeyPrefix',
 *                      'hbase.regionserver.region.split_restriction.delimiter' => ','}}
 * </code>
 * </pre>
 *
 * Instead of specifying a split restriction to a table directly, we can also set the properties
 * in hbase-site.xml. In this case, the specified split restriction is applied for all the tables.
 * <p>
 * Note that the split restriction is also applied to a user-specified split point so that we don't
 * allow users to break the restriction.
 *
 * @see NoRegionSplitRestriction
 * @see KeyPrefixRegionSplitRestriction
 * @see DelimitedKeyPrefixRegionSplitRestriction
 */
@InterfaceAudience.Private
public abstract class RegionSplitRestriction {
  // some code
}