我正在研究 Lettuce 集群 Java 客户端。它在 bolt 拓扑 (Apache Strom) 中设置。 spout 正在从 kafka 读取数据并将其传递给 bolt。但是，当我开始我的拓扑时，我收到以下错误消息并且程序终止。我错过了什么吗？是什么原因造成的？

堆栈跟踪

29502 [Thread-17-RecommendationLettuceBolt-executor[2 2]] ERROR o.a.s.util - Async loop died! io.lettuce.core.RedisException: Cannot retrieve initial cluster partitions from initial URIs [RedisURI [host='127.0.0.1', port=7001]] at io.lettuce.core.cluster.RedisClusterClient.loadPartitions(RedisClusterClient.java:865) ~[lettuce-core-5.1.7.RELEASE.jar:?] at io.lettuce.core.cluster.RedisClusterClient.initializePartitions(RedisClusterClient.java:819) ~[lettuce-core-5.1.7.RELEASE.jar:?] at io.lettuce.core.cluster.RedisClusterClient.connect(RedisClusterClient.java:345) ~[lettuce-core-5.1.7.RELEASE.jar:?] at com.projectName.indexer.lettuce.LettuceClusterClientProvider.getConnection(LettuceClusterClientProvider.java:72) ~[classes/:?] at com.projectName.indexer.lettuce.LettuceCacheRepopulationHandler.openLettuceConnection(LettuceCacheRepopulationHandler.java:42) ~[classes/:?] at com.projectName.indexer.bolts.RecommendationLettuceBolt.prepare(RecommendationLettuceBolt.java:35) ~[classes/:?] at org.apache.storm.daemon.executor$fn__8058$fn__8071.invoke(executor.clj:795) ~[storm-core-1.0.2.jar:1.0.2] at org.apache.storm.util$async_loop$fn__624.invoke(util.clj:482) [storm-core-1.0.2.jar:1.0.2] at clojure.lang.AFn.run(AFn.java:22) [clojure-1.7.0.jar:?] at java.base/java.lang.Thread.run(Thread.java:844) [?:?] Caused by: io.lettuce.core.RedisConnectionException: Unable to establish a connection to Redis Cluster at [RedisURI [host='127.0.0.1', port=7001]] at io.lettuce.core.cluster.topology.AsyncConnections.get(AsyncConnections.java:89) ~[lettuce-core-5.1.7.RELEASE.jar:?] at io.lettuce.core.cluster.topology.ClusterTopologyRefresh.loadViews(ClusterTopologyRefresh.java:73) ~[lettuce-core-5.1.7.RELEASE.jar:?] at io.lettuce.core.cluster.RedisClusterClient.doLoadPartitions(RedisClusterClient.java:871) ~[lettuce-core-5.1.7.RELEASE.jar:?] at io.lettuce.core.cluster.RedisClusterClient.loadPartitions(RedisClusterClient.java:844) ~[lettuce-core-5.1.7.RELEASE.jar:?] ... 9 more

输入代码

private void init() {
       redisUri = RedisURI.Builder
                .redis(lettuceConfig.getLettuceClusterHost())
                .withPort(lettuceConfig.getLettuceClusterPort())
                .withTimeout(Duration.ofMillis(lettuceConfig.getLettuceClusterTimeout()))
                .build();
}


public StatefulRedisClusterConnection getConnection() {
        if (connection == null || !connection.isOpen()) {
            redisClusterClient = RedisClusterClient.create(redisUri);
            final ClusterTopologyRefreshOptions topologyRefreshOptions = ClusterTopologyRefreshOptions.builder()
                    .enablePeriodicRefresh(Duration.ofMinutes(BoltConstants.Lettuce.PERIODIC_REFRESH_TIME_IN_MIN))
                    .enableAdaptiveRefreshTrigger()
                    .build();
            final ClusterClientOptions clusterClientOptions = ClusterClientOptions.builder()
                    .autoReconnect(true)
                    .topologyRefreshOptions(topologyRefreshOptions)
                    .build();
            redisClusterClient.setOptions(clusterClientOptions);
            connection = redisClusterClient.connect(SnappyCompressor.wrap(new StringCodec()));
            log.info("Connected to Redis client lettuce. lettuce connection is up and running.");
        }
        return connection;
    }

环境

compile 'io.lettuce:lettuce-core:5.1.7.RELEASE'

最佳答案

出现错误是因为我没有在我的机器上本地安装 redis 集群。

我用这些步骤解决了

https://redis.io/download并运行以下命令 Installation

$ wget http://download.redis.io/releases/redis-5.0.5.tar.gz
$ tar xzf redis-5.0.5.tar.gz
$ cd redis-5.0.5
$ make //The binaries that are now compiled are available in the src directory
$ src/redis-server

Creating a Redis Cluster using the create-cluster script

现在检查 Redis 发行版中的 redis-5.0.5/utils/create-cluster 目录。里面有一个叫做create-cluster 的脚本，它是一个简单的bash 脚本。为了启动一个具有 3 个主节点和 3 个从节点的 6 节点集群，只需键入以下命令:

$ create-cluster start  // start 
$ create-cluster create // create cluster

$ create-cluster stop // for stoping 
$ create-cluster clean // clean all the cluster

您将在终端中看到以下输出

$ ps aux |grep redis
300067846        28222   0.6  0.0  4379932   2612   ??  Ss    7:41PM   0:00.73 ../../src/redis-server *:30004 [cluster]                  
300067846        28227   0.5  0.0  4380956   2604   ??  Ss    7:41PM   0:00.71 ../../src/redis-server *:30006 [cluster]                  
300067846        28218   0.4  0.0  4381980   2676   ??  Ss    7:41PM   0:00.73 ../../src/redis-server *:30002 [cluster]                  
300067846        28216   0.4  0.0  4374812   2576   ??  Ss    7:41PM   0:00.50 ../../src/redis-server *:30001 [cluster]                  
300067846        28225   0.4  0.0  4380956   2632   ??  Ss    7:41PM   0:00.68 ../../src/redis-server *:30005 [cluster]                  
300067846        28220   0.3  0.0  4379932   2596   ??  Ss    7:41PM   0:00.52 ../../src/redis-server *:30003 [cluster]                  
300067846        85550   0.0  0.0  4309420   1128   ??  S     3:08PM   0:07.76 redis-server *:6379

查看所有主从节点

../redis-5.0.5/utils/create-cluster$ cat nodes-3000*.conf

您可以更新 Redis 集群配置。打开 vi create-cluster 并根据需要更新以下配置。

// default config are these 
CLUSTER_HOST=127.0.0.1
PORT=30000
TIMEOUT=2000
NODES=6
REPLICAS=1

关于java - 无法从初始 URI [RedisURI [主机 ='127.0.0.1'，端口 = 7001]] 检索初始集群分区，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57179927/