Running with docker compose fails connecting to Cassandra

[amotzhoshen]

I installed gemini according to the docker-compose documentation, then ran:

> docker-compose exec gemini ./hash /repositories

It results with:

Running Hashing as Apache Spark job, master: local[*]
Hashing 2 repositories in: '/repositories' ()
	file:/repositories/186661fcc144ea9c6ed0a57e706b94a3526a7daa.siva
	file:/repositories/c093e97dc56b5f91d93f503bf69b5ebc126d2e36.siva
Exception in thread "main" java.io.IOException: Failed to open native connection to Cassandra at {172.18.0.4}:9042
	at com.datastax.spark.connector.cql.CassandraConnector$.com$datastax$spark$connector$cql$CassandraConnector$$createSession(CassandraConnector.scala:168)
	at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$8.apply(CassandraConnector.scala:154)
	at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$8.apply(CassandraConnector.scala:154)
	at com.datastax.spark.connector.cql.RefCountedCache.createNewValueAndKeys(RefCountedCache.scala:32)
	at com.datastax.spark.connector.cql.RefCountedCache.syncAcquire(RefCountedCache.scala:69)
	at com.datastax.spark.connector.cql.RefCountedCache.acquire(RefCountedCache.scala:57)
	at com.datastax.spark.connector.cql.CassandraConnector.openSession(CassandraConnector.scala:79)
	at com.datastax.spark.connector.cql.CassandraConnector.withSessionDo(CassandraConnector.scala:111)
	at tech.sourced.gemini.cmd.HashSparkApp$.delayedEndpoint$tech$sourced$gemini$cmd$HashSparkApp$1(HashSparkApp.scala:175)
	at tech.sourced.gemini.cmd.HashSparkApp$delayedInit$body.apply(HashSparkApp.scala:38)
	at scala.Function0$class.apply$mcV$sp(Function0.scala:34)
	at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
	at scala.App$$anonfun$main$1.apply(App.scala:76)
	at scala.App$$anonfun$main$1.apply(App.scala:76)
	at scala.collection.immutable.List.foreach(List.scala:381)
	at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
	at scala.App$class.main(App.scala:76)
	at tech.sourced.gemini.cmd.HashSparkApp$.main(HashSparkApp.scala:38)
	at tech.sourced.gemini.cmd.HashSparkApp.main(HashSparkApp.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:755)
	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180)
	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:119)
	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: scylla/172.18.0.4:9042 (com.datastax.driver.core.exceptions.TransportException: [scylla/172.18.0.4:9042] Cannot connect))
	at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:233)
	at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:79)
	at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1483)
	at com.datastax.driver.core.Cluster.getMetadata(Cluster.java:399)
	at com.datastax.spark.connector.cql.CassandraConnector$.com$datastax$spark$connector$cql$CassandraConnector$$createSession(CassandraConnector.scala:161)
	... 27 more```

[smacker]

hi @amotzhoshen ! sorry for the late response. Could you please verify that ScyllaDB started correctly for you? You can see the status of containers using docker-compose status and to see the logs docker-compose logs scylla.