Cassandra：NoHostAvailableException：所有主机尝试查询失败答案

【问题标题】：Cassandra :NoHostAvailableException: All host(s) tried for query failedCassandra：NoHostAvailableException：所有主机尝试查询失败
【发布时间】：2021-09-16 15:47:28
【问题描述】：

我正在将最简单策略 Cassandra 的数据库中的数据复制到另一个数据库中。它们具有相同的键空间结构。但是，当我运行命令 sstableloader --nodes 时出现以下错误。有谁知道如何解决这个错误？

Cassandra 的版本： 3.11.10

命令行： # sstableloader --nodes 127.0.0.0 /var/lib/cassandra/loadme/keyspace/table01-5eef6110d04111ebb620bd376a9dc9e9/snapshots/dropped-1624306636002-table01

堆栈跟踪错误：

All host(s) tried for query failed (tried: /127.0.0.0:9042 (com.datastax.driver.core.exceptions.TransportException: [/127.0.0.0] Cannot connect))
com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /127.0.0.0:9042 (com.datastax.driver.core.exceptions.TransportException: [/127.0.0.0] Cannot connect))
        at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:233)
        at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:79)
        at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1424)
        at com.datastax.driver.core.Cluster.init(Cluster.java:163)
        at com.datastax.driver.core.Cluster.connectAsync(Cluster.java:334)
        at com.datastax.driver.core.Cluster.connectAsync(Cluster.java:309)
        at com.datastax.driver.core.Cluster.connect(Cluster.java:251)
        at org.apache.cassandra.utils.NativeSSTableLoaderClient.init(NativeSSTableLoaderClient.java:73)
        at org.apache.cassandra.io.sstable.SSTableLoader.stream(SSTableLoader.java:159)
        at org.apache.cassandra.tools.BulkLoader.load(BulkLoader.java:80)
        at org.apache.cassandra.tools.BulkLoader.main(BulkLoader.java:48)
Exception in thread "main" org.apache.cassandra.tools.BulkLoadException: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /127.0.0.0:9042 (com.datastax.driver.core.exceptions.TransportException: [/127.0.0.0] Cannot connect))
        at org.apache.cassandra.tools.BulkLoader.load(BulkLoader.java:93)
        at org.apache.cassandra.tools.BulkLoader.main(BulkLoader.java:48)
Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /127.0.0.0:9042 (com.datastax.driver.core.exceptions.TransportException: [/127.0.0.0] Cannot connect))
        at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:233)
        at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:79)
        at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1424)
        at com.datastax.driver.core.Cluster.init(Cluster.java:163)
        at com.datastax.driver.core.Cluster.connectAsync(Cluster.java:334)
        at com.datastax.driver.core.Cluster.connectAsync(Cluster.java:309)
        at com.datastax.driver.core.Cluster.connect(Cluster.java:251)
        at org.apache.cassandra.utils.NativeSSTableLoaderClient.init(NativeSSTableLoaderClient.java:73)
        at org.apache.cassandra.io.sstable.SSTableLoader.stream(SSTableLoader.java:159)
        at org.apache.cassandra.tools.BulkLoader.load(BulkLoader.java:80)
        ... 1 more

【问题讨论】：

Cassandra 是否在 127.0.0.0 上启动并运行？
是的。标准配置和最简单的策略键空间。
“netstat -tln | grep 9042”返回什么，省略 qoutes？
@apesa，这是命令的返回：tcp 0 0 127.0.0.1:9042 0.0.0.0:* LISTEN

标签： cassandra datastax database-replication cassandra-3.0

【解决方案1】：

在您的命令行中，您传递了--nodes 127.0.0.0，但在 netstat 输出端口 9042（本机传输）正在侦听 127.0.0.1。尝试将命令行更改为--nodes 127.0.0.1

当您收到错误 All host(s) tried for query failed 并且 nodetool 指示您的集群已启动并运行时，请始终确保正确的端口绑定到您的 IP 或 localhost。

【讨论】：