Simple spring boot app that inserts 1M random key into redis using one connection and pipelining

RedisMassImport.java

package me.grison.redis.foo;

import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.context.annotation.*;
import redis.clients.jedis.*;

import java.util.UUID;

@ComponentScan
@Configuration
@SpringBootApplication
@EnableAutoConfiguration
public class RedisMassImport {
	@Bean
	JedisPool jedisPool() {
		JedisPoolConfig poolConfig = new JedisPoolConfig();
		poolConfig.setTestOnBorrow(true);
		poolConfig.setTestWhileIdle(true);
		return new JedisPool(poolConfig, "localhost", 6379, 30);
	}

	@Bean
	CommandLineRunner init(JedisPool pool) {
		return args -> {
			int numKeys = 1_000_000;
			try (Jedis jedis = pool.getResource()) {
				// prepare UUIDs
				String[] uuids = new String[numKeys];
				for (int i = 0; i < numKeys; ++i)
					uuids[i] = UUID.randomUUID().toString();

				long time = System.nanoTime();
				Pipeline p = jedis.pipelined();
				for (int i = 0; i < numKeys; ++i)
					p.set(uuids[i], uuids[i]);
				p.sync();
				long endTime = System.nanoTime();
				System.out.println("\tTook " + (endTime - time) + "ns to sync the pipeline.");
			}
		};
	}


	public static void main(String[] args) {
		SpringApplication.run(RedisMassImport.class, args);
	}
}