Is your Hive Metastore running on port 8020 (or exposed to the rest of the system that way)? The default port is 9083. Also, what version of NiFi (Apache or HDF, and what major/minor version) are you using, and what version of Hive (Apache Hive, HDP, etc.) are you trying to connect to? Lastly, can you find the stack trace associated with that error (usually in logs/nifi-app.log) and share it? It likely has more information about what exactly is causing the error.
The attached logs doesn't have the error stack trace. Attach the correct nifi-app.log file and for the port info, you can get that from Ambari.
HDF based on NiFi 1.5.0 has not yet been released. What is the version of HDF? Or are you using Apache NiFi 1.5.0? You will need HDF NiFi (current latest version at the time of this writing is 3.0.2) to talk to HDP Hive. Also I'm not sure if NiFi's Hive processors will work with Hive 2, they might but they are based on the Hive 1.x line.