server/apps/distributed-pop3-app/sample-configuration/cassandra-driver.conf

# James reference configuration for the DataStax Java driver for Apache Cassandra®.
#
# Unless you use a custom mechanism to load your configuration (see
# SessionBuilder.withConfigLoader), all the values declared here will be used as defaults.
#
# See https://docs.datastax.com/en/developer/java-driver/4.13/manual/core/configuration/ for
# available options.
#
# Please note that contact point and authentication needs to be set in cassandra.properties for now.
datastax-java-driver {

  basic.request {
    timeout = 5 seconds

    consistency = QUORUM

    page-size = 5000

    serial-consistency = SERIAL
  }

  advanced.connection {
    connect-timeout = 5 seconds

    init-query-timeout = 5 seconds

    pool {
      local.size = 2

      remote.size = 2
    }

    max-requests-per-connection = 1024

    max-orphan-requests = 256

    warn-on-init-error = true
  }

  advanced.throttler {
    // class = org.apache.james.backends.cassandra.utils.LockLessConcurrencyLimitingRequestThrottler
    class = ConcurrencyLimitingRequestThrottler

    max-queue-size = 10000

    max-concurrent-requests = 192
  }

  advanced.reconnect-on-init = true

  advanced.reconnection-policy {
    class = ExponentialReconnectionPolicy

    base-delay = 1 second
    max-delay = 60 seconds
  }

  advanced.retry-policy {
    class = DefaultRetryPolicy
  }

  advanced.ssl-engine-factory {
    // class = DefaultSslEngineFactory

    // hostname-validation = true

    // truststore-path = /path/to/client.truststore
    // truststore-password = password123
    // keystore-path = /path/to/client.keystore
    // keystore-password = password123
  }

  advanced.request-tracker {
    logs {
      slow {
        threshold = 2 second

        enabled = true
      }

      max-query-length = 500
    }
  }

  advanced.metrics {
    factory {
      class = DefaultMetricsFactory
    }

    id-generator {
      class = DefaultMetricIdGenerator
      prefix = "cassandra"
    }
    session {
      enabled = [
        // bytes-sent,

        // bytes-received

        // connected-nodes,

        // cql-requests,

        // cql-client-timeouts,

        // cql-prepared-cache-size,

        // throttling.delay,

        // throttling.queue-size,

        // throttling.errors,

      ]

      cql-requests {
        highest-latency = 10 seconds

        lowest-latency = 1 millisecond

        significant-digits = 3

        refresh-interval = 5 minutes
      }
    }
  }

  profiles {
    # Provides controls on Execution profiles used by James
    LWT {
      basic.request.consistency = SERIAL
      basic.request.serial-consistency = SERIAL
    }
    CACHING {
      basic.request.consistency = LOCAL_ONE
      basic.request.serial-consistency = LOCAL_ONE
      basic.request.timeout = 100 milliseconds
    }
    OPTIMISTIC_CONSISTENCY_LEVEL {
      basic.request.consistency = LOCAL_ONE
      basic.request.serial-consistency = LOCAL_ONE
    }
    BATCH {
      basic.request.timeout = 1 hour
    }
  }
}