## Description:

This processor retrieves one or more files from GridFS. The query can be provided in one of three ways:

- Query configuration parameter.
- Built for you by configuring the filename parameter. (Note: this is just a filename, Mongo queries cannot be embedded in the field).
- Retrieving the query from the flowfile contents.

The processor can also be configured to either commit only once at the end of a fetch operation or after each file that is retrieved. Multiple commits is generally only necessary when retrieving a lot of data from GridFS as measured in total data size, not file count, to ensure that the disks NiFi is using are not overloaded.