Yes Hunk is the older name for Splunk Analytics for Hadoop. They are both licensed the same.
Splunk Analytics for Hadoop is already part of normal Splunk, so you do not need to install any additional Splunk software (you do need Hadoop and Java on the Search Head)
Using Splunk Hadoop Connect will copy the files from HDFS to Splunk indexers. Splunk Analytics for Hadoop will not index the data in Splunk, but will run MR jobs on the Hadoop cluster and will return the results.
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