Question

我在网络上有一台CentOS机器。我试图通过express-cassandra node_module使用NodeJS连接Cassandra。当我启动我的应用程序时，它会给我以下错误日志。

0|app      | 2018-03-07T14:49:21.329 ERROR cassandra 4456 { 
NoHostAvailableError: All host(s) tried for query failed. First host tried, 
127.0.0.1:9160: OperationTimedOutError: The host 127.0.0.1:9160 did not 
reply before timeout 12000 ms. See innerErrors.
0|app      |     at whilstEnded 
(/opt/cisco/sprint5_node/node_modules/cassandra-driver/lib/control-
connection.js:231:25)
0|app      |     at next (/opt/cisco/sprint5_node/node_modules/cassandra-
driver/lib/utils.js:842:14)
0|app      |     at borrowConnectionCallback 
(/opt/cisco/sprint5_node/node_modules/cassandra-driver/lib/control-
connection.js:226:9)
0|app      |     at HostConnectionPool.create.err 
(/opt/cisco/sprint5_node/node_modules/cassandra-driver/lib/host-connection-
pool.js:71:16)
0|app      |     at Object.onceWrapper (events.js:315:30)
0|app      |     at emitOne (events.js:116:13)
0|app      |     at HostConnectionPool.emit (events.js:211:7)
0|app      |     at whilstEnded 
(/opt/cisco/sprint5_node/node_modules/cassandra-driver/lib/host-connection-
pool.js:173:23)
0|app      |     at next (/opt/cisco/sprint5_node/node_modules/cassandra-
driver/lib/utils.js:839:14)
0|app      |     at HostConnectionPool.<anonymous> 
(/opt/cisco/sprint5_node/node_modules/cassandra-driver/lib/utils.js:851:9)
0|app      |     at Object.onceWrapper (events.js:315:30)
0|app      |     at emitOne (events.js:121:20)
0|app      |     at HostConnectionPool.emit (events.js:211:7)
0|app      |     at attemptOpenCallback 
(/opt/cisco/sprint5_node/node_modules/cassandra-driver/lib/host-connection-
pool.js:223:21)
0|app      |     at Connection.errorConnecting 
(/opt/cisco/sprint5_node/node_modules/cassandra-
driver/lib/connection.js:225:3)
0|app      |     at Socket.socketError 
(/opt/cisco/sprint5_node/node_modules/cassandra-
driver/lib/connection.js:146:10)
0|app      |   name: 'NoHostAvailableError',
0|app      |   info: 'Represents an error when a query cannot be performed 
because no host is available or could be reached by the driver.',

我尝试在其他链接的帮助下更改rpc_address，listen_address，但仍面临问题。

这是绑定模型的代码

cassandra_model.setDirectory(path.resolve() + '/app' + '/models')
.bind({
    clientOptions: {
        contactPoints: [config.cassandra.ip],
        protocolOptions: { port: config.cassandra.port },
        keyspace: config.cassandra.keyspace,
        queryOptions: { consistency: cassandra_model.consistencies.one },
        socketOptions: { readTimeout: 0 }
    },
    ormOptions: {
        defaultReplicationStrategy: {
            class: 'SimpleStrategy',
            replication_factor: 1
        },
        migration: 'alter',
        createKeyspace: true
    }
}, function onError(err) {
    cassandra_model.timeuuid()
    if (err) {
        logger.error(err);
    }
    else {
        logger.info('Cassandra_model initialized!');
    }
});

上面的代码工作正常。现在我想连接到密钥空间而不绑定模型。所以尝试了以下代码。

    var ExpressCassandra = require('express-cassandra');
var models = ExpressCassandra.createClient({
    clientOptions: {
        contactPoints: [config.cassandra.ip],
        protocolOptions: { port: 9042 },
        keyspace: config.cassandra.keyspace,
        queryOptions: { consistency: ExpressCassandra.consistencies.one }
    },
    ormOptions: {
        defaultReplicationStrategy: {
            class: 'SimpleStrategy',
            replication_factor: 1
        },
        migration: 'safe',
    }
}, function onError(err) {
    cassandra_model.timeuuid()
    if (err) {
        logger.error(err);
    }
    else {
        logger.info('Cassandra initialized!');
    }
});

但我无法连接到cassandra。我在这里做错了什么？

Cassandra错误：NoHostAvailableError经常

0 个答案: