InvalidQueryException: Consistency level LOCAL_ONE is not supported for this operation. Supported consistency levels are: LOCAL_QUORUM

Question

import org.apache.spark._
import org.apache.spark.SparkContext._
import com.datastax.spark.connector._
import com.datastax.spark.connector.cql.CassandraConnector    
val conf = new SparkConf()
          .setMaster("local[*]")
          .setAppName("XXXX")
          .set("spark.cassandra.connection.host" ,"cassandra.us-east-2.amazonaws.com")
          .set("spark.cassandra.connection.port", "9142")
          .set("spark.cassandra.auth.username", "XXXXX")
          .set("spark.cassandra.auth.password", "XXXXX")
          .set("spark.cassandra.connection.ssl.enabled", "true")
          .set("spark.cassandra.connection.ssl.trustStore.path", "/home/nihad/.cassandra/cassandra_truststore.jks")
          .set("spark.cassandra.connection.ssl.trustStore.password", "XXXXX")
          .set("spark.cassandra.output.consistency.level", "LOCAL_QUORUM")
    
    val connector = CassandraConnector(conf)
           val session = connector.openSession()
               sesssion.execute("""INSERT INTO "covid19".delta_by_states (state_code, state_value, date ) VALUES ('kl', 5, '2020-03-03');""")
session.close()

i amn trying to write data to AWS Cassandra Keyspace using Spark App set in my local system. Problem is when i execute above code, I get Exception like below:

"com.datastax.oss.driver.api.core.servererrors.InvalidQueryException: Consistency level LOCAL_ONE is not supported for this operation. Supported consistency levels are: LOCAL_QUORUM"

As you can see from the above code I have already set cassandra.output.consistency.level as LOCAL_QUORUM in Spark Conf. Also I am using datastax cassandra driver.

But when I read data from AWS Cassandra, it works fine. Also I tried same INSERT command in AWS Keyspace cqlsh. It is working fine there too. So Query is valid.

Can someone help me how to set consistency via datastax.CassandraConnector?

Answer 1

Cracked it.

Instead of setting cassandra consistency via spark config. I created an application.conf file in src/main/resources directory.

    datastax-java-driver {

        basic.contact-points = [ "cassandra.us-east-2.amazonaws.com:9142"]
    advanced.auth-provider{
        class = PlainTextAuthProvider
        username = "serviceUserName"
        password = "servicePassword"
    }
    basic.load-balancing-policy {
        local-datacenter = "us-east-2"
    }

    advanced.ssl-engine-factory {
        class = DefaultSslEngineFactory
        truststore-path = "yourPath/.cassandra/cassandra_truststore.jks"
        truststore-password = "trustorePassword"
      }

    basic.request.consistency = LOCAL_QUORUM 
    basic.request.timeout = 5 seconds 
    
}

and created cassandra session like below

import com.datastax.oss.driver.api.core.config.DriverConfigLoader
import com.datastax.oss.driver.api.core.CqlSession

val loader = DriverConfigLoader.fromClassPath("application.conf")
val session = CqlSession.builder().withConfigLoader(loader).build()
sesssion.execute("""INSERT INTO "covid19".delta_by_states (state_code, state_value, date ) VALUES ('kl', 5, '2020-03-03');""")

It finally worked. No need to mess with spark config Doc for Driver Config https://docs.datastax.com/en/drivers/java/4.0/com/datastax/oss/driver/api/core/config/DriverConfigLoader.html#fromClasspath-java.lang.String-

datastax configuration doc https://docs.datastax.com/en/developer/java-driver/4.6/manual/core/configuration/reference/