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Issue in Hadoop 2.6.0 where two applications appear when using REST API to submit jobs

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I'm using Hadoop in my university project and I'm building an application for demonstration purposes. I've decided to use the REST API because I'll be demoing remotely.
I'm trying to get the 'wordcount' example to run using a JSON query and it seems to work fine.

My question is why does Hadoop start two applications, see image: Hadoop

I submitted application: "application_1427474834422_0015" and then another starts. Is this normal behaviour?

The original application fails because the output directory in the two applications (application Hadoop starts andd application I start) is the same.

Here is the JSON query I used:

Thanks for your time.
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