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Think About Production, Silly!

Oren Eini user avatar by
Oren Eini
·
Dec. 23, 12 · Interview
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We just finished doing a big optimization in RavenDB, and one of the things that we needed to do was to store additional (internal) information so we could act upon it later on. If you must know, we now keep track of stats during indexing and can select the appropriate indexing approach based on the amount of data that we have available.

The details about this aren’t that important. What is important is that this is a piece of data that is used by RavenDB to make decisions. That means that just about the worst thing that we could possibly do is leave things at this state:

Think about what will happen in production, when you have an annoyed (and tired) ops team trying to figure out what is going on. Having a black box is the worst thing that you could possibly do, because you give the admin absolutely no input. And remember, you are going to be the one on call when the support phone rings.

One of the very final touches that we did was to add a debug endpoint that will expose those details to the user, so we could actually inspect them at runtime, and in production.  We have a lot of those, some are intended for monitoring purposes, such as the /admin/stats or the /databases/db-name/stats endpoints, some are meant for troubleshooting, such as the /databases/db-name/logs?type=errorendpoint and some are purely for debugging purposes, such as /databases/db-name/indexes/index/name?debug=keys which gives you the stats about all the keys in a map/reduce index.

Trust me, you are going to need those, at some point.

Production (computer science)

Published at DZone with permission of Oren Eini, DZone MVB. See the original article here.

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