After an example given in a recent discussion, I've started considering 
using pull queues for pipeline's

I'm currently using datastore, querying elements and deleting them, it's 
not very solid as datastore queries are not reliable, I'm not sure what 
happens when you delete 200 items and re-run the query 4-5 seconds later

Pull queues seem great, however without solid tagging, I can only think of 
limited use cases

I was thinking of using datastore key's as tags and pulling tasks by that 
tag's - if it isn't solid, I will just keep on doing what I'm doing now

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You might ask - how could it not be solid? let me give a not-solid example:
I was using Search API's Atom Field's for arbitrary tagging (unrelated to 
above use case :), turns out you can only have max 1000 field names, and 
when you reach that 1000, the whole thing explodes, you can't enter new 
field names, you have to resort to deprecated schema reset functions etc.
There could be something like that for pull queues too, that's why I'm 
asking, is anyone using the tagging feature?

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