@Astronaut Bigdatanova 1) Testing tools : Really good guide http://www.michael-noll.com/blog/2011/04/09/benchmarking-and-stress-testing-an-hadoop-cluster-with-terasort-testdfsio-nnbench-mrbench/ 2) Yes , we do need separate clusters for dev, QA and Prod ( Same as RDBMS world) for users to test and QA before prod releases. 3) Active-Active (3rd party tools like Wandisco) , Active-Passive , Apache Falcon is best for DR. 4) Get familiar with the Hadoop stack. Get familiar with 100% open source model of Hadoop. There are vendors who are selling Hadoop but not 100% open source. Hortonworks is the only 100% open source enterprise ready hadoop "no vendor lock in". Once you pick the vendor then learn the technology stack Operations, Security, Data operating system ...Please see this blog https://www.linkedin.com/pulse/20141204175510-28584737-rdbms-to-hadoop The above blog covers the sandbox and other details. ... View more

@hkropp Details from support: It should be fixed in Ambari 2.2 also We think what probably happened was the connection was open for too long which is why it said there was a broken pipe when you tried to access the hive view. When you did a restart to opened a fresh connection and was able to connect. Probably just a refresh of the ambari page would have reset the connection as well. ... View more