To see how Splunk collaborate with Hortonworks please see this link: http://hortonworks.com/partner/splunk/
As you can see from this link: http://hortonworks.com/hdp/ Sparks is a set of APIs and is one part of a set of about 30 Hadoop related projects. That means with Sparks you still need a different system to collect the data, index the data, store the data, analyze the data, visualize the data, and secure the data.
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