I /really/ like Apache Ranger + Apache Knox for security. I think it's a better approach than Cloudera's Sentry approach, particularly when you only need to focus on LDAP integration and don't want to mess with Kerberos. There is still some work to do there, but it's off to a great start.
I think there needs to be better integration of components with Ambari. For example, Ranger and Hue have to be installed manually and are not managed with Ambari. On larger Hadoop clusters that can be a real hassle. I'm told that Ambari integration for those components are coming in the near future (Q1 or Q2 2015), so I'm looking forward to that.
I've benchmarked Hive queries using both MR and Tez. There are clear performance advantages to using Tez. It's not nearly as fast as Impala. However I have queries that won't run on Impala due to memory limits that run perfectly fine with Hive.
If you haven't tried Hortonworks HDP 2.2 yet, I recommend you give it a try. I think you'll be pleasantly surprised.
#hortonworks #hdp #hadoop
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