I belive you need to figure why multiple Spark apps are running. If this is not a production cluster, and no one is going to get affected out of restarting SPARK, you can look into that option. But this just makes me to believe that the configuration settings for SPARK on how many SPARK apps are supposed to run is most probably the difference between two of your clusters. I am not an expert in SPARK to point you to the correct config to look for. ... View more

Jay not in this issue , but I will happy to get tour answer about my quastion from - https://community.hortonworks.com/questions/142356/how-to-recover-the-standby-name-node-in-ambari-clu.html ... View more

thank you so much ... View more

I think i know the problem , I will explain , we reinstall again all 3 masters machines without to delete the workers machine from the cluster , now we want to add them back to the cluster , but we get warning about the current configuration on the workers , so my question is - how to re-delete the workers machine from the cluster in spite the masters machine are new machines? what we can do in order to add the workers machine again to the ambari cluster? * we have more then 20 workers machine that we need to add to the cluster , and they not deleted from the cluster before we reinstall the masters machine ) ... View more

Hi @uri ben-ari, zookeeper name can be found from ambari (can any of the zookeeper server ) Kafka topic name is the directory name without the partition index (after Kafka-logs ex : mmno.aso.prpl.proces ) on the other note : logs are Kafka messages, not the application logs hence please look for the option to reduce the retention of the topic so that will purge some of the un-used messages from topic. ... View more

I succeeded to change it but still nodemanager cant start ... View more