In CM "Spark Client Advanced Configuration Snippet (Safety Valve) for spark-conf/spark-defaults.conf." in the Spark Service. I can see my values being written in /etc/spark/conf/spark-defaults.conf correctly.
Now I submit a Spark job (part of Oozie workflow). I expect that the hbase config is picked up from the class path, but it is not. I can see the correct setting in the Spark Histroy Server for the job:
but the connection to the Zookeeper is not honoring the host that is specified in the hbase.zookeeper.quorum setting from the hbase-site.xml file, but is trying to connect to localhost.
I wish I can specify the hbase-site.xml globally, and not for each of the Spark jobs, as I have many, so my intention is to confgure this globally. What am I doing wrong? What is the best practice to follow in this case?
Without reviewing the logs, If I can guess on the issue, If you are submitting the Spark job from Oozie Shell action, then I would suspect the problem is with Oozie's behavior of setting the environment variable HADOOP_CONF_DIR behind the scene. There is an internal Jira that tracks this behavior/work. The KB  explains a bit on this (even though it is reported for the hive-site.xml, I think it may influence the HBase client conf as well).
Try working around the problem by following the instructions on the KB  and see if it helps.