Akka cluster using Cassandra driver and running on EKS, with Keyspaces for Cassandra, generates weird warning

This WARN happens after an action is performed by the Cassandra driver after persisting data.

[2020-09-10 07:12:00,123] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-1] [] - [s0|/3.25.37.71:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0x6416a3c0, L:/10.62.160.46:38170 - R:3.25.37.71/3.25.37.71:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:00,128] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-0] [] - [s0|/3.25.37.70:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0xfc77d13f, L:/10.62.160.46:55334 - R:3.25.37.70/3.25.37.70:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:00,159] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-0] [] - [s0|/3.25.37.127:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0xaed46d98, L:/10.62.160.46:41326 - R:3.25.37.127/3.25.37.127:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:00,203] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-1] [] - [s0|/3.25.37.66:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0xf8f9a736, L:/10.62.160.46:32856 - R:3.25.37.66/3.25.37.66:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:00,387] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-1] [] - [s0|/3.25.37.126:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0x30782974, L:/10.62.160.46:53796 - R:3.25.37.126/3.25.37.126:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:00,459] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-0] [] - [s0|/3.25.37.125:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0x740c3446, L:/10.62.160.46:44512 - R:3.25.37.125/3.25.37.125:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:00,477] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-0] [] - [s0|/3.25.37.65:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0xd6a32bed, L:/10.62.160.46:58432 - R:3.25.37.65/3.25.37.65:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:00,515] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-1] [] - [s0|/3.25.37.121:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0xbfff5e3c, L:/10.62.160.46:51852 - R:3.25.37.121/3.25.37.121:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:03,776] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-1] [] - [s0|/3.25.37.71:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0xd5751f2b, L:/10.62.160.46:38222 - R:3.25.37.71/3.25.37.71:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:04,002] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-1] [] - [s0|/3.25.37.126:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0x31832a99, L:/10.62.160.46:53842 - R:3.25.37.126/3.25.37.126:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:04,112] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-0] [] - [s0|/3.25.37.125:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0x593bdfca, L:/10.62.160.46:44558 - R:3.25.37.125/3.25.37.125:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:04,214] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-1] [] - [s0|/3.25.37.66:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0x74181e17, L:/10.62.160.46:32908 - R:3.25.37.66/3.25.37.66:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:04,299] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-0] [] - [s0|/3.25.37.70:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0xd940b5f6, L:/10.62.160.46:55396 - R:3.25.37.70/3.25.37.70:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:04,386] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-0] [] - [s0|/3.25.37.127:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0x0c030eca, L:/10.62.160.46:41386 - R:3.25.37.127/3.25.37.127:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:04,608] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-1] [] - [s0|/3.25.37.121:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0xc87a74f8, L:/10.62.160.46:51902 - R:3.25.37.121/3.25.37.121:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))
[2020-09-10 07:12:04,657] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-0] [] - [s0|/3.25.37.65:9142]  Error while opening new channel (ConnectionInitException: [s0|id: 0x7fa12653, L:/10.62.160.46:58486 - R:3.25.37.65/3.25.37.65:9142] Protocol initialization request, step 1 (STARTUP {CQL_VERSION=3.0.0, DRIVER_NAME=DataStax Java driver for Apache Cassandra(R), DRIVER_VERSION=4.4.0, CLIENT_ID=e5c3c8f8-553e-4ffb-a753-f33678d6d15c}): failed to send request (javax.net.ssl.SSLException: SSLEngine closed already))

The data is still being persisted tough.

Also, used the suggested configuration by AWS : https://docs.aws.amazon.com/keyspaces/latest/devguide/programmatic.credentials.html#programmatic.credentials.SigV4_MCS

datastax-java-driver {

    basic.contact-points = [${?CASSANDRA_DNS_AND_PORT}]

    advanced.auth-provider{
        class = software.aws.mcs.auth.SigV4AuthProvider
        aws-region = ap-southeast-2
    }

    basic.load-balancing-policy {
        local-datacenter = "ap-southeast-2"
    }

    advanced.ssl-engine-factory {
        class = DefaultSslEngineFactory
        truststore-path = "/cassandra_truststore.jks"
        truststore-password = ${?CASSANDRA_TRUSTSTORE_PASSWORD}
    }
}

datastax-java-driver.profiles {
  akka-persistence-cassandra-profile {
    basic.request.consistency = LOCAL_QUORUM
  }
}