Pierre Padovani commented on ATLAS-2270:

[~davidrad] I'd be happy to be a contributor and get this in. How does one go 
about becoming one? Are there a set of guidelines somewhere specific to this 

We've been running the Cassandra + ES 5.x flavor of Atlas as both a self 
contained docker container for dev purposes, as well as a full blown HA cluster 
for at least the last two months. So I think it looks like a pretty stable 

> Supported combinations of persistent store and index backend
> ------------------------------------------------------------
>                 Key: ATLAS-2270
>                 URL: https://issues.apache.org/jira/browse/ATLAS-2270
>             Project: Atlas
>          Issue Type: Bug
>            Reporter: Graham Wallis
>            Priority: Major
> We need to discuss and decide which combinations of persistent store and 
> indexing backend Atlas 1.0.0 (master) should support. This includes 
> building/running Atlas as a standalone package and running UTs/ITs as part of 
> the Atlas build. 
> This JIRA focusses on titan0 and janusgraph 0.2.0, as they are the graph 
> databases that will be supported in master/1.0.0. This JIRA deliberately 
> ignores titan1 and janusgraph 0.1.1 as the former should be 
> deprecated/removed and the other is a transient state as we get to janusgraph 
> 0.2.0. 
> With titan0 as the graph provider, Atlas has supported the following 
> combinations of persistent store and indexer. It is suggested that this set 
> is kept unchanged:
> {{
> titan0              solr          es
> ------------------------------------
> berkeley           0              1
> hbase               1              0
> cassandra        0              0
> }}
> With janusgraph (0.2.0) as the graph provider, Atlas *could* support 
> additional combinations. Cassandra is included in this discussion pending 
> response to ATLAS-2259.
> {{
> janus 0.2.0      solr          es
> ------------------------------------
> berkeley           ?              1
> hbase               1              ?
> cassandra        ?              ?
> }}
> It is suggested that the combinations marked with '1' should be continued and 
> the remaining 4 combinations, marked with '?', should be considered. There 
> seems to be evidence of people using all 4 of these combinations, although 
> not necessarily with Atlas.
> Depending on the decision made above, we need to ensure that it is possible 
> to build Atlas as a standalone package with any of the combinations - i.e. 
> that they are mutually exclusive and do not interfere with one another. They 
> currently interfere which makes it impossible to build Atlas with 
> -Pdist,berkeley-elasticsearch because the 'dist' profile will exclude jars 
> that are needed by the berkeley-elasticsearch profile - which leads to class 
> not found exceptions when the Atlas server is started. The solution to this 
> could be very simple, or slightly more sophisticated, depending on how many 
> of the combinations we choose to support.

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