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** [tickets:#8109] Reduce gridfs index creation**
**Status:** in-progress
**Milestone:** unreleased
**Labels:** performance
**Created:** Thu Jul 28, 2016 07:53 PM UTC by Dave Brondsema
**Last Updated:** Thu Jul 28, 2016 07:53 PM UTC
**Owner:** Dave Brondsema
The `File` class creates a `GridFS` for basically any operation. This includes
viewing any attachment, thumbnail, project icon, project screenshot etc. The
pymongo GridFS code creates an index on `{ files_id: 1, n: 1 }` every time
(with a little caching from going through `ensure_index`) which is a really
unnecessary. Pymongo 3.1 avoids all that index creation (see
[here](http://api.mongodb.com/python/current/api/gridfs/index.html) but we
aren't able to upgrade to pymongo 3.x since Ming doesn't support it yet: see
https://sourceforge.net/p/merciless/bugs/27/ and
https://sourceforge.net/p/merciless/mailman/merciless-discuss/thread/CAJfq2JEicmKpwb31uN1ju%3D1jS0bVDS6fGVjk3n-dpL-BEFX3fg%40mail.gmail.com/#msg34734599
We can work around it a little bit for the `GridFS()` constructor on 2.x But
the index will still be created on deletes and writes (within the `GridIn`
class)
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