Connect to External Spark Cluster

#1

Hi

I am trying to connect to a Spark Standalone cluster (dockerized) from my local dockerized seahorse but I get the following error below.
Note : I am using Seahorse version 1.4.3 and Spark Version is 2.3.1.

ERROR] [2019-04-09 05:12:11,507] [appclient-registration-retry-thread]  org.apache.spark.scheduler.cluster.StandaloneSchedulerBackend - Application has been killed. Reason: All masters are unresponsive! Giving up.
[WARN ] [2019-04-09 05:12:11,508] [main]  org.apache.spark.scheduler.cluster.StandaloneSchedulerBackend - Application ID is not initialized yet.
[WARN ] [2019-04-09 05:12:11,546] [dispatcher-event-loop-0]  org.apache.spark.deploy.client.StandaloneAppClient$ClientEndpoint - Drop UnregisterApplication(null) because has not yet connected to master