Question

我一直试图为我的Lagom设置设置外部Cassandra。

在root pom中我写过

                    <configuration>
                        <unmanagedServices>
                            <cas_native>http://ip:9042</cas_native>
                        </unmanagedServices>
                        <cassandraEnabled>false</cassandraEnabled>
                    </configuration>

在我的impl application.conf

中

akka {
persistent {
  journal {
  akka.persistence.journal.plugin = "this-cassandra-journal"

      this-cassandra-journal {
        contact-points = ["10.15.2.179"]
        port = 9042
        cluster-id = "cas_native"

        keyspace = "hello"

        authentication.username = "cassandra"
        authentication.password = "rodney"
        # Parameter indicating whether the journal keyspace should be auto created
        keyspace-autocreate = true

        # Parameter indicating whether the journal tables should be auto created
        tables-autocreate = true
      }
  }

  snapshot-store {
    akka.persistence.snapshot-store.plugin = "this-cassandra-snapshot-store"

      this-cassandra-snapshot-store {
        contact-points = ["10.15.2.179"]
        port = 9042
        cluster-id = "cas_native"

        keyspace = "hello_snap"
        authentication.username = "cassandra"
        authentication.password = "rodney"
        # Parameter indicating whether the journal keyspace should be auto created
        keyspace-autocreate = true

        # Parameter indicating whether the journal tables should be auto created
        tables-autocreate = true
      }
    }

}

但是我收到了错误

[warn] a.p.c.j.CassandraJournal - Failed to connect to Cassandra and initialize.
 It will be retried on demand. Caused by: Authentication error on host /10.15.2.
179:9042: Host /10.15.2.179:9042 requires authentication, but no authenticator f
ound in Cluster configuration
[warn] a.p.c.s.CassandraSnapshotStore - Failed to connect to Cassandra and initi
alize. It will be retried on demand. Caused by: Authentication error on host /10
.15.2.179:9042: Host /10.15.2.179:9042 requires authentication, but no authentic
ator found in Cluster configuration
[warn] a.p.c.j.CassandraJournal - Failed to connect to Cassandra and initialize.
 It will be retried on demand. Caused by: Authentication error on host /10.15.2.
179:9042: Host /10.15.2.179:9042 requires authentication, but no authenticator f
ound in Cluster configuration
[error] a.c.s.PersistentShardCoordinator - Persistence failure when replaying ev
ents for persistenceId [/sharding/ProductCoordinator]. Last known sequence numbe
r [0]
com.datastax.driver.core.exceptions.AuthenticationException: Authentication erro
r on host /10.15.2.179:9042: Host /10.15.2.179:9042 requires authentication, but
 no authenticator found in Cluster configuration
        at com.datastax.driver.core.AuthProvider$1.newAuthenticator(AuthProvider
.java:40)
        at com.datastax.driver.core.Connection$5.apply(Connection.java:250)
        at com.datastax.driver.core.Connection$5.apply(Connection.java:234)
        at com.google.common.util.concurrent.Futures$AsyncChainingFuture.doTrans
form(Futures.java:1442)
        at com.google.common.util.concurrent.Futures$AsyncChainingFuture.doTrans
form(Futures.java:1433)
        at com.google.common.util.concurrent.Futures$AbstractChainingFuture.run(
Futures.java:1408)
        at com.google.common.util.concurrent.Futures$2$1.run(Futures.java:1177)
        at com.google.common.util.concurrent.MoreExecutors$DirectExecutorService
.execute(MoreExecutors.java:310)
        at com.google.common.util.concurrent.Futures$2.execute(Futures.java:1174
)

我也试过提供这个配置

lagom.persistence.read-side {
  cassandra {
  }
}

如何通过为Cassandra提供凭据来使其工作？

Answer 1

在Lagom中，您可能已经为akka-persistence-cassandra和journal使用了snapshot-store设置（请参阅source code中的reference.conf），然后向下滚动cassandra-snapshot-store.authentication.* }）。没有必要配置它，因为Lagom对Cassandra持久性的支持已经将akka-persistence-cassandra声明为Akka Persistence实现：

akka.persistence.journal.plugin = cassandra-journal akka.persistence.snapshot-store.plugin = cassandra-snapshot-store

请参阅https://github.com/lagom/lagom/blob/c63383c343b02bd0c267ff176bfb4e48c7202d7d/persistence-cassandra/core/src/main/resources/play/reference-overrides.conf#L5-L6

连接Lagom和Cassandra时要配置的第三个位是Lagom的Read-Side。如果您覆盖the defaults，也可以通过application.conf执行此操作。

请注意每个存储可能使用不同的Cassandra Ring / Keyspace /凭证/ ...因此您可以单独调整它们。

请参阅Lagom docs中的额外信息。

Lagom外部Cassandra身份验证

1 个答案: