We currently use MongoDB 3.0 with MMAP storage, and would like to upgrade to 3.2 WiredTiger. What is the best order?

From: Daniel Galinkin <danielgalinkin@xxxxxxxxx>
To: mongodb-user <mongodb-user@xxxxxxxxxxxxxxxx>
Date: Mon, 18 Apr 2016 06:05:39 -0700 (PDT)
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Hello guys,

As explained in the subject, we currently use MongoDB 3.0 with MMAP 
storage, and would like to upgrade to 3.2 WiredTiger.
What would be the best course of action?
- First upgrade the storage to wired tiger, and then upgrade the mongo 
version, or;
- upgrade the mongo version first, maintaining the storage engine, and then 
upgrade it to wired tiger?

Regards,
Daniel

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