We recently decommissioned one of our DataNodes. Afterwords, Ambari has been complaining about the "Percent DataNodes Available" Alert because it is still counting the decommissioned DataNode. The "DataNode Process" alert is OK for all of the remaining DataNodes. HDFS shows that all of the DataNodes are Started and Live. How can we get Ambari to stop complaining about the DataNode that no longer exists? ... View more

I am trying to understand how to configure the SSL settings for Zeppelin so that it works with HTTPS. I have a certificate for the server domain from Let's Encrypt, so I was expecting a setting for the path to the pem file. However, that is not what zeppelin uses and I do not understand the different settings. I am currently using Ambari 2.6.2.0. I tried looking at some guides online, but I do not understand them and could not get things to work. Do the zeppelin.server.port and zeppelin.server.ssl.port settings need to be different or will it still work if they are the same? What is zeppelin.ssl.client.auth for? Where is the zeppelin.ssl.key.manager.password supposed to come from? Which Key Manager is this referring to? Where is the zeppelin.ssl.keystore.password supposed to come from? What is a keystore? Where is the zeppelin.ssl.truststore.password supposed to come from? What is a truststore? Is there some reference that I can look at that explains all of these things? Any assistance is greatly appreciated. Thank you very much. ... View more