[allura:tickets] Re: #6905 better code snapshot status UX

[Dave Brondsema <br...@users.sf.net>]

If you can add 'status' to that query, then it would be.  But without it, it will not use any index:

~~~~
> db.monq_task.find({'task_name': 'allura.tasks.repo_tasks.tarball', '$or': [{'kwargs': {'path': '', 'revision': '790b7439e8c598ae1029a817c93cd5406584a746'}}, {'args':['790b7439e8c598ae1029a817c93cd5406584a746', '']}]}).explain()
{
	"cursor" : "BasicCursor",
         ...
	"nscanned" : 42350,
         ...


> db.monq_task.find({'state': 'busy', 'task_name': 'allura.tasks.repo_tasks.tarball', '$or': [{'kwargs': {'path': '', 'revision': '790b7439e8c598ae1029a817c93cd5406584a746'}}, {'args':['790b7439e8c598ae1029a817c93cd5406584a746', '']}]}).explain()
{
	"cursor" : "BtreeCursor state_1_task_name_1_time_queue_1",
        ...
	"nscanned" : 0,
        ...
~~~~

`BasicCursor` means no index is used, `BtreeCursor` means an index is being used.  See http://docs.mongodb.org/manual/core/index-compound/ for more info on mongo indexes (including the Prefixes section at bottom).  To see what indexes are specified for a model/collection, look at the `indexes` var within the `__mongometa__` section of our python class.  And there is always an index on `_id`


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** [tickets:#6905] better code snapshot status UX**

**Status:** in-progress
**Labels:** 42cc ux 
**Created:** Wed Nov 20, 2013 09:44 PM UTC by Dave Brondsema
**Last Updated:** Fri Jan 03, 2014 11:49 AM UTC
**Owner:** nobody

The current snapshot behavior doesn't really tell the user what's going on.  After you request a snapshot, it says its looking for one and then just waits for a while until either the snapshot is ready or it suggests that you re-submit.  The system should be able to check to see if there is a background task running or not.  If it is actively running, we should say that.  And not prompt to re-submit.

Make sure any monq_task queries will be efficient, by using existing indexes.  Constructing an ObjectId from timestamp and querying on _id to just look for recent tasks may be helpful.


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