You can find more details on what components have been removed in NiFi 2 here: https://cwiki.apache.org/confluence/display/NIFI/Deprecated+Components+and+Features
Also for reference: https://cwiki.apache.org/confluence/display/NIFI/Migration+Guidance
For HDFS components specifically, there are not packaged in the convenience binary file (ie. nifi-2.0.0-bin.zip) but the components are still built and made available through Maven repositories. You can download the appropriate NARs as needed: