我正在尝试通过使用spring-boot-starter-data-redis和生菜库并低于异常，以集群模式连接到Redis，
2019-08-21 00:55:42.695 WARN 75 --- [ioEventLoop-6-1] i.l.c.c.topology.ClusterTopologyRefresh : Unable to connect to myhostname.service:6379
java.util.concurrent.CompletionException: java.net.UnknownHostException: myhostname.service: Name or service not known
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292) ~[na:1.8.0_181]
at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308) ~[na:1.8.0_181]
at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:593) ~[na:1.8.0_181]
at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577) ~[na:1.8.0_181]
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474) ~[na:1.8.0_181]
at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977) ~[na:1.8.0_181]
at io.lettuce.core.AbstractRedisClient.lambda$initializeChannelAsync$1(AbstractRedisClient.java:275) ~[lettuce-core-5.0.4.RELEASE.jar!/:na]
at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:485) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.DefaultPromise.setFailure(DefaultPromise.java:112) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.channel.DefaultChannelPromise.setFailure(DefaultChannelPromise.java:89) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.bootstrap.Bootstrap.doResolveAndConnect0(Bootstrap.java:216) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.bootstrap.Bootstrap.access$000(Bootstrap.java:49) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.bootstrap.Bootstrap$1.operationComplete(Bootstrap.java:188) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.bootstrap.Bootstrap$1.operationComplete(Bootstrap.java:174) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:485) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:103) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:84) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.channel.AbstractChannel$AbstractUnsafe.safeSetSuccess(AbstractChannel.java:978) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:512) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(AbstractChannel.java:423) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:482) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:465) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_181]
Caused by: java.net.UnknownHostException: master1.event-store-service-V-70125f6-2-1566348843-redis.service: Name or service not known
at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method) ~[na:1.8.0_181]
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928) ~[na:1.8.0_181]
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323) ~[na:1.8.0_181]
at java.net.InetAddress.getAllByName0(InetAddress.java:1276) ~[na:1.8.0_181]
at java.net.InetAddress.getAllByName(InetAddress.java:1192) ~[na:1.8.0_181]
at java.net.InetAddress.getAllByName(InetAddress.java:1126) ~[na:1.8.0_181]
at java.net.InetAddress.getByName(InetAddress.java:1076) ~[na:1.8.0_181]
at io.netty.util.internal.SocketUtils$8.run(SocketUtils.java:146) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.util.internal.SocketUtils$8.run(SocketUtils.java:143) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_181]
at io.netty.util.internal.SocketUtils.addressByName(SocketUtils.java:143) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.resolver.DefaultNameResolver.doResolve(DefaultNameResolver.java:43) ~[netty-resolver-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.resolver.SimpleNameResolver.resolve(SimpleNameResolver.java:63) ~[netty-resolver-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.resolver.SimpleNameResolver.resolve(SimpleNameResolver.java:55) ~[netty-resolver-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:57) ~[netty-resolver-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:32) ~[netty-resolver-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.resolver.AbstractAddressResolver.resolve(AbstractAddressResolver.java:108) ~[netty-resolver-4.1.25.Final.jar!/:4.1.25.Final]
at io.netty.bootstrap.Bootstrap.doResolveAndConnect0(Bootstrap.java:208) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
... 18 common frames omitted
注意：“ myhostname.service”是由于我正在使用consul，并且可以ping myhostname.service，也可以使用“ redis-cli -c -h myhostname.service -p 6379”命令连接到它。
我连接到Redis的代码是
@Configuration
@ConfigurationProperties(prefix = "redis")
public class LettuceCacheConfig {
private static Logger logger = LoggerFactory.getLogger(LettuceCacheConfig.class);
private static Long topologyRefreshDuration = 10L;
private static int maxRedirects = 3;
private String servers;
private String profileName;
private String password;
private PoolConfig poolConfig = new PoolConfig();
class PoolConfig {
int maxTotal;
int maxIdle;
int minIdle;
public PoolConfig() {
}
}
public LettuceClientConfiguration getLettuceClientConfig() {
final ClusterTopologyRefreshOptions options = ClusterTopologyRefreshOptions.builder()
.enablePeriodicRefresh(Duration.of(topologyRefreshDuration, ChronoUnit.MINUTES))
.enableAllAdaptiveRefreshTriggers().dynamicRefreshSources(true).build();
final LettuceClientConfiguration lettuceClientConfig = LettuceClientConfiguration.builder()
.clientOptions(ClusterClientOptions.builder().topologyRefreshOptions(options)
.validateClusterNodeMembership(false).build())
.build();
return lettuceClientConfig;
}
private GenericObjectPoolConfig getPoolingConfiguration() {
final GenericObjectPoolConfig config = new GenericObjectPoolConfig();
config.setMaxIdle(this.poolConfig.getMaxIdle());
config.setMaxTotal(this.poolConfig.getMaxTotal());
config.setMinIdle(this.poolConfig.getMinIdle());
return config;
}
public RedisClusterConfiguration getClusterConfiguration() {
final RedisClusterConfiguration clusterConfiguration = new RedisClusterConfiguration();//new RedisClusterConfiguration(getRedisServers());
String hostPort = getRedisServers().get(0);
String tokens[] = hostPort.split(":");
logger.info("REDIS HOST IS {}", tokens[0]);
logger.info("REDIS PORT IS {}", tokens[1]);
clusterConfiguration.clusterNode(tokens[0], Integer.parseInt(tokens[1]));
clusterConfiguration.setMaxRedirects(maxRedirects);
logger.info("PASSWORD is {}",password);
clusterConfiguration.setPassword(RedisPassword.of(password));
return clusterConfiguration;
}
private List<String> getRedisServers() {
String tokens[] = servers.split(",");
logger.debug("Redis Servers are {}", Arrays.toString(tokens));
return Arrays.asList(tokens);
}
@Bean
public RedisConnectionFactory getLettuceConnectionFactory() {
return new LettuceConnectionFactory(getClusterConfiguration(),
getLettuceClientConfig());
}
}
因为我在java.net.InetAddress.getByName（“ hostname”）遇到异常，所以
从我的应用程序容器运行redis-cli以连接到redis集群容器成功。（如上所述）
因为我在java.net.InetAddress.getByName（“ hostname”）处遇到异常，所以我使用Redis主机名从我的应用容器内部尝试了相同的方法。它成功并且没有引发UnknownHostException。
从应用容器ping通到redis主机。
我确实在本地计算机上设置了redis-cluster，它可以与上面的代码一起正常工作，只有更改是我提供了127.0.0.1:6379而不是hostname.service：6379。
我正在使用spring-boot-starter-parent：2.0.3.RELEASE和lettuce-core：5.0.4。代码有问题吗？
答案 0 :(得分：0)
我不能说这完全回答了这个问题，但是找到了问题的原因。问题是应用容器启动时，redis容器/服务仍未在领事馆注册，因此查找名称为“ master1.redis.service”的redis容器会返回UnknownHostException。但是，由于我运行redis-cli并在一段时间后执行ping操作，所以没有连接问题。我通过重新启动应用程序容器（同时保持Redis容器处于启动状态）验证了这一点，然后没有UnknownHostException。我不知道的原因是，如果最初是否存在UnknowHostException，为什么ClusterTopologyRefreshOptions不起作用？按照我的想法，它应该在一段时间后再次查询主机名，并从领事那里获得解析/ ip。但这没有发生