api/java/src/main/java/com/navercorp/redis/cluster/BinaryRedisClusterClient.java
public void decrBy(final byte[] key, final long integer) {
        sendCommand(Command.DECRBY, key, RedisProtocol.toByteArray(integer));
    }
public void decrBy(final byte[] key, final long integer) {
        sendCommand(Command.DECRBY, key, RedisProtocol.toByteArray(integer));
    }
Decr by.

@param key     the key
@param integer the integer