On: FoundationDB Document Layer

[rhacker]

I don't know much about foundationDB, but when they say API compatible, are they referring to the technical TCP/IP connection stack, or ALSO the concepts of collections and the query language of MongoDB (such as aggregations, find, limit, etc..)

In other words can I throw a giant aggregation query with all mongo's various crazy query language syntax and it will.. work the same?

[sbr464 → rhacker]

It doesn't support the aggregation framework currently.

Here is a list of differences:

https://foundationdb.github.io/fdb-document-layer/known-diff...

[spullara → sbr464]

Can someone who uses MongoDB at scale (many machines, single db) talk about how big gap is between what FDB supports and what their application uses?

[rubyn00bie → rhacker]

Here's what seems to me comprehensive list:

https://foundationdb.github.io/fdb-document-layer/known-diff...

Looks like there are definitely some shortcomings, but also some wins... From the link:

> Sessions

> MongoDB® has introduced sessions in v3.6. The Document Layer doesn’t support sessions yet. Sessions in MongoDB® enable better consistency guarentees. It’s important to note that, even though the Document Layer doesn’t support sessions, it has better consistency guarentees by default due to FoundationDB backend.