如何解决为什么Lettuce的连接操作比Jedis需要更多的时间？
连接到本地Redis，生菜需要近5000毫秒，而Jedis仅需要30毫秒。 我指的是示例ConnectToRedis
我使用具有lombok依赖关系的默认spring-boot-starter：
我的代码：
@Component
@Slf4j
class LettuceRunner implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
StopWatch watch = new StopWatch();
RedisClient redisClient = RedisClient.create("redis://localhost:6379");
watch.start();
StatefulRedisConnection<String,String> connection = redisClient.connect();
watch.stop();
log.info("lettuce : {} ms",watch.getLastTaskTimeMillis());
connection.close();
redisClient.shutdown();
}
}
@Component
@Slf4j
class JedisRunner implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
StopWatch watch = new StopWatch();
watch.start();
Jedis jedis = new Jedis("localhost");
jedis.get("redis_key");
watch.stop();
log.info("jedis : {} ms",watch.getLastTaskInfo().getTimeMillis());
}
}
其结果是：
2020-08-14 17：02：28.236 INFO 21760 --- [main] com.example.demo.JedisRunner：jedis：27毫秒 2020-08-14 17：02：33.318 INFO 21760 --- [main] com.example.demo.LettuceRunner：生菜：4815毫秒
解决方法
因为生菜使用Netty，并且花费大量时间在Netty中启动事物。
检查日志，如您所见，所花费的大部分时间都在io.netty软件包中：
2020-08-15 00:54:06.030 DEBUG 728 --- [ main] i.l.c.r.DefaultEventLoopGroupProvider : Creating executor io.netty.util.concurrent.DefaultEventExecutorGroup
2020-08-15 00:54:06.031 DEBUG 728 --- [ main] io.lettuce.core.RedisClient : Trying to get a Redis connection for: RedisURI [host='localhost',port=6379]
2020-08-15 00:54:06.120 DEBUG 728 --- [ main] io.lettuce.core.EpollProvider : Starting without optional epoll library
2020-08-15 00:54:06.122 DEBUG 728 --- [ main] io.lettuce.core.KqueueProvider : Starting without optional kqueue library
2020-08-15 00:54:06.123 DEBUG 728 --- [ main] i.l.c.r.DefaultEventLoopGroupProvider : Allocating executor io.netty.channel.nio.NioEventLoopGroup
2020-08-15 00:54:06.123 DEBUG 728 --- [ main] i.l.c.r.DefaultEventLoopGroupProvider : Creating executor io.netty.channel.nio.NioEventLoopGroup
2020-08-15 00:54:06.124 DEBUG 728 --- [ main] i.n.channel.MultithreadEventLoopGroup : -Dio.netty.eventLoopThreads: 12
2020-08-15 00:54:06.129 DEBUG 728 --- [ main] io.netty.channel.nio.NioEventLoop : -Dio.netty.noKeySetOptimization: false
2020-08-15 00:54:06.129 DEBUG 728 --- [ main] io.netty.channel.nio.NioEventLoop : -Dio.netty.selectorAutoRebuildThreshold: 512
2020-08-15 00:54:06.421 DEBUG 728 --- [ main] i.l.c.r.DefaultEventLoopGroupProvider : Adding reference to io.netty.channel.nio.NioEventLoopGroup@7c59cf66,existing ref count 0
2020-08-15 00:54:06.431 DEBUG 728 --- [ main] io.lettuce.core.RedisClient : Resolved SocketAddress localhost:6379 using RedisURI [host='localhost',port=6379]
2020-08-15 00:54:06.432 DEBUG 728 --- [ main] io.lettuce.core.RedisClient : Connecting to Redis at localhost:6379
2020-08-15 00:54:06.435 DEBUG 728 --- [ main] io.netty.channel.DefaultChannelId : -Dio.netty.processId: 728 (auto-detected)
2020-08-15 00:54:06.437 DEBUG 728 --- [ main] io.netty.util.NetUtil : -Djava.net.preferIPv4Stack: false
2020-08-15 00:54:06.437 DEBUG 728 --- [ main] io.netty.util.NetUtil : -Djava.net.preferIPv6Addresses: false
2020-08-15 00:54:06.659 DEBUG 728 --- [ main] io.netty.util.NetUtil : Loopback interface: lo (Software Loopback Interface 1,127.0.0.1)
2020-08-15 00:54:06.660 DEBUG 728 --- [ main] io.netty.util.NetUtil : Failed to get SOMAXCONN from sysctl and file \proc\sys\net\core\somaxconn. Default: 200
2020-08-15 00:54:06.898 DEBUG 728 --- [ main] io.netty.channel.DefaultChannelId : -Dio.netty.machineId: 00:50:56:ff:fe:c0:00:08 (auto-detected)
2020-08-15 00:54:06.911 DEBUG 728 --- [ main] io.netty.buffer.ByteBufUtil : -Dio.netty.allocator.type: pooled
2020-08-15 00:54:06.912 DEBUG 728 --- [ main] io.netty.buffer.ByteBufUtil : -Dio.netty.threadLocalDirectBufferSize: 0
2020-08-15 00:54:06.912 DEBUG 728 --- [ main] io.netty.buffer.ByteBufUtil : -Dio.netty.maxThreadLocalCharBufferSize: 16384
2020-08-15 00:54:06.928 DEBUG 728 --- [ioEventLoop-8-1] io.netty.util.Recycler : -Dio.netty.recycler.maxCapacityPerThread: 4096
2020-08-15 00:54:06.928 DEBUG 728 --- [ioEventLoop-8-1] io.netty.util.Recycler : -Dio.netty.recycler.maxSharedCapacityFactor: 2
2020-08-15 00:54:06.928 DEBUG 728 --- [ioEventLoop-8-1] io.netty.util.Recycler : -Dio.netty.recycler.linkCapacity: 16
2020-08-15 00:54:06.928 DEBUG 728 --- [ioEventLoop-8-1] io.netty.util.Recycler : -Dio.netty.recycler.ratio: 8
2020-08-15 00:54:06.928 DEBUG 728 --- [ioEventLoop-8-1] io.netty.util.Recycler : -Dio.netty.recycler.delayedQueue.ratio: 8
2020-08-15 00:54:06.933 DEBUG 728 --- [ioEventLoop-8-1] io.netty.buffer.AbstractByteBuf : -Dio.netty.buffer.checkAccessible: true
2020-08-15 00:54:06.933 DEBUG 728 --- [ioEventLoop-8-1] io.netty.buffer.AbstractByteBuf : -Dio.netty.buffer.checkBounds: true
2020-08-15 00:54:06.933 DEBUG 728 --- [ioEventLoop-8-1] i.n.util.ResourceLeakDetectorFactory : Loaded default ResourceLeakDetector: io.netty.util.ResourceLeakDetector@20e9fc6c
2020-08-15 00:54:06.950 DEBUG 728 --- [ioEventLoop-8-1] io.lettuce.core.protocol.CommandHandler : [channel=0x1ced470d,[id: 0x7bd077d9] (inactive),chid=0x1] channelRegistered()
2020-08-15 00:54:06.953 DEBUG 728 --- [ioEventLoop-8-1] io.lettuce.core.protocol.CommandHandler : [channel=0x1ced470d,/127.0.0.1:2106 -> localhost/127.0.0.1:6379,chid=0x1] channelActive()
2020-08-15 00:54:06.954 DEBUG 728 --- [ioEventLoop-8-1] i.lettuce.core.protocol.DefaultEndpoint : [channel=0x1ced470d,epid=0x1] activateEndpointAndExecuteBufferedCommands 0 command(s) buffered
2020-08-15 00:54:06.954 DEBUG 728 --- [ioEventLoop-8-1] i.lettuce.core.protocol.DefaultEndpoint : [channel=0x1ced470d,epid=0x1] activating endpoint
2020-08-15 00:54:06.954 DEBUG 728 --- [ioEventLoop-8-1] i.lettuce.core.protocol.DefaultEndpoint : [channel=0x1ced470d,epid=0x1] flushCommands()
2020-08-15 00:54:06.954 DEBUG 728 --- [ioEventLoop-8-1] i.lettuce.core.protocol.DefaultEndpoint : [channel=0x1ced470d,epid=0x1] flushCommands() Flushing 0 commands
2020-08-15 00:54:06.954 DEBUG 728 --- [ioEventLoop-8-1] i.l.core.protocol.ConnectionWatchdog : [channel=0x1ced470d,last known addr=localhost/127.0.0.1:6379] channelActive()
2020-08-15 00:54:06.954 DEBUG 728 --- [ioEventLoop-8-1] io.lettuce.core.protocol.CommandHandler : [channel=0x1ced470d,chid=0x1] channelActive() done
2020-08-15 00:54:06.955 DEBUG 728 --- [ioEventLoop-8-1] io.lettuce.core.RedisClient : Connecting to Redis at localhost:6379: Success
2020-08-15 00:54:06.956 INFO 728 --- [ main] c.h.s.c.c.CacheStudyApplicationTests : lettuce : 925 ms
2020-08-15 00:54:06.956 DEBUG 728 --- [ main] io.lettuce.core.RedisChannelHandler : close()
2020-08-15 00:54:06.956 DEBUG 728 --- [ main] io.lettuce.core.RedisChannelHandler : closeAsync()
2020-08-15 00:54:06.956 DEBUG 728 --- [ main] i.lettuce.core.protocol.DefaultEndpoint : [channel=0x1ced470d,epid=0x1] closeAsync()
2020-08-15 00:54:06.957 DEBUG 728 --- [ioEventLoop-8-1] i.l.core.protocol.ConnectionWatchdog : [channel=0x1ced470d,last known addr=localhost/127.0.0.1:6379] userEventTriggered(ctx,io.lettuce.core.ConnectionEvents$Activated@1cda757f)
2020-08-15 00:54:06.958 DEBUG 728 --- [ main] io.lettuce.core.RedisClient : Initiate shutdown (0,2,SECONDS)
2020-08-15 00:54:06.959 DEBUG 728 --- [ioEventLoop-8-1] io.lettuce.core.protocol.CommandHandler : [channel=0x1ced470d,chid=0x1] channelInactive()
2020-08-15 00:54:06.959 DEBUG 728 --- [ioEventLoop-8-1] i.lettuce.core.protocol.DefaultEndpoint : [channel=0x1ced470d,epid=0x1] deactivating endpoint handler
2020-08-15 00:54:06.960 DEBUG 728 --- [ioEventLoop-8-1] io.lettuce.core.protocol.CommandHandler : [channel=0x1ced470d,chid=0x1] channelInactive() done
2020-08-15 00:54:06.960 DEBUG 728 --- [ioEventLoop-8-1] i.l.core.protocol.ConnectionWatchdog : [channel=0x1ced470d,last known addr=localhost/127.0.0.1:6379] channelInactive()
2020-08-15 00:54:06.960 DEBUG 728 --- [ioEventLoop-8-1] i.l.core.protocol.ConnectionWatchdog : [channel=0x1ced470d,last known addr=localhost/127.0.0.1:6379] Reconnect scheduling disabled
2020-08-15 00:54:06.960 DEBUG 728 --- [ioEventLoop-8-1] io.lettuce.core.protocol.CommandHandler : [channel=0x1ced470d,chid=0x1] channelUnregistered()
2020-08-15 00:54:06.961 DEBUG 728 --- [ main] i.l.c.resource.DefaultClientResources : Initiate shutdown (0,SECONDS)
2020-08-15 00:54:06.963 DEBUG 728 --- [ main] i.l.c.r.DefaultEventLoopGroupProvider : Initiate shutdown (0,SECONDS)
2020-08-15 00:54:06.963 DEBUG 728 --- [ main] i.l.c.r.DefaultEventLoopGroupProvider : Release executor io.netty.channel.nio.NioEventLoopGroup@7c59cf66
2020-08-15 00:54:06.965 DEBUG 728 --- [ioEventLoop-8-1] io.netty.buffer.PoolThreadCache : Freed 1 thread-local buffer(s) from thread: lettuce-nioEventLoop-8-1
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