无法从初始URI [RedisURI [host='127.0.0.1', port=7001]] 检索初始集群分区。

Question

我正在处理莴苣集群Java客户端。它被设置在bolt拓扑结构（Apache Strom）内。 spout从kafka读取数据并将其传递给bolt。但是，当我启动我的拓扑时，我会收到以下错误消息并终止程序。我错过了什么吗？这是什么原因引起的？

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) at io.lettuce.core.cluster.RedisClusterClient.initializePartitions(RedisClusterClient.java:819) at io.lettuce.core.cluster.RedisClusterClient.connect(RedisClusterClient.java:345) at com.projectName.indexer.lettuce.LettuceClusterClientProvider.getConnection(LettuceClusterClientProvider.java:72) at com.projectName.indexer.lettuce.LettuceCacheRepopulationHandler.openLettuceConnection(LettuceCacheRepopulationHandler.java:42) at com.projectName.indexer.bolts.RecommendationLettuceBolt.prepare(RecommendationLettuceBolt.java:35) at org.apache.storm.daemon.executor$fn__8058$fn__8071.invoke(executor.clj:795) at org.apache.storm.util$async_loop$fn__624.invoke(util.clj:482) at clojure.lang.AFn.run(AFn.java:22) 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) at io.lettuce.core.cluster.topology.ClusterTopologyRefresh.loadViews(ClusterTopologyRefresh.java:73) at io.lettuce.core.cluster.RedisClusterClient.doLoadPartitions(RedisClusterClient.java:871) at io.lettuce.core.cluster.RedisClusterClient.loadPartitions(RedisClusterClient.java:844) ... 9 more

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'

- roottraveller

---

https://github.com/lettuce-io/lettuce-core/issues/296 解决了问题，但没有对解决方案进行评论。 - roottraveller

#GitHub错误工单 https://github.com/lettuce-io/lettuce-core/issues/1088 - roottraveller

Answer 1

错误是因为我本地机器上没有安装redis集群。我通过以下步骤解决了这个问题。请从https://redis.io/download下载并执行以下命令：安装。

$ 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

使用create-cluster脚本创建Redis集群

现在检查Redis发行版中的redis-5.0.5/utils/create-cluster目录。里面有一个名为create-cluster的脚本，它是一个简单的bash脚本。为了启动一个包含3个主节点和3个从节点的6个节点集群，请执行以下命令：

$ 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

- roottraveller