Lagom external Cassandra authentication - cassandra

Question

I have been trying to set up an external Cassandra for my Lagom setup.
In root pom I have written
<configuration>
<unmanagedServices>
<cas_native>http://ip:9042</cas_native>
</unmanagedServices>
<cassandraEnabled>false</cassandraEnabled>
</configuration>
In my impl application.conf
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
}
}
}
But I get the error
[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
)
I also tried providing this config
lagom.persistence.read-side {
cassandra {
}
}
How to make it work by providing credentials for Cassandra?

Answer 1

In Lagom, you may already use akka-persistence-cassandra settings for your journal and snapshot-store (see reference.conf in the source code, and scroll down for cassandra-snapshot-store.authentication.*). There's no need to configure it because Lagom's support for Cassandra persistence already declares akka-persistence-cassandraas the Akka Persistence implementation:
akka.persistence.journal.plugin = cassandra-journal
akka.persistence.snapshot-store.plugin = cassandra-snapshot-store
See https://github.com/lagom/lagom/blob/c63383c343b02bd0c267ff176bfb4e48c7202d7d/persistence-cassandra/core/src/main/resources/play/reference-overrides.conf#L5-L6
The third last bit to configure when connecting Lagom to Cassandra is Lagom's Read-Side. That is also doable via application.conf if you override the defaults.
Note how each storage may use a different Cassandra Ring/Keyspace/credentials/... so you can tune them separately.
See extra info in the Lagom docs.