Thank you Kevin and Marc for quick response. I tried both the queries and they are working as expected. My use case demands to run such query for a bigger dataset. I ran the query for 1 lakh vertices and 5 million edges in my desktop using the in-memory backend (assuming that in-memory will be faster compared to other external data stores) and it took roughly 2 minutes to execute. My desktop contains 8 logical cores and 64 GB RAM. Few questions regarding the same:

1. Is this the expected performance for such aggregation queries in JanusGraph?

2. Will increasing the number of cores (i.e. processing power) improve the performance of the query?

The dataset I am dealing with can be as big as 1.5 lakh vertices and 20 million edges and I would like to support the above aggregation query in real time (i.e. in few seconds and not in minutes). Can we achieve the same using JanusGraph?

On Thursday, December 17, 2020 at 7:51:56 PM UTC+5:30 kt...@... wrote:

Thanks for improving it!  Always good to learn more.

On Thu, Dec 17, 2020 at 6:11 AM HadoopMarc <b...@...> wrote:

And here a small variation without the keys and with some code formatting:

g.V().as('a').outE().as('e').inV().as('b').
    group().by(
        union(select('a').values('organization'), select('b').values('organization')).fold()
    ).by(
        select('e').by('collaborationHours').sum()
    ).unfold()

==>[marketing, engineering]=2
==>[sales, marketing]=2
==>[engineering, sales]=3
==>[engineering, marketing]=2

Marc

Op donderdag 17 december 2020 om 14:50:11 UTC+1 schreef kt...@...:

Vishu,

This may not be optimal, but seems to work:

g.E().hasLabel('collaboration').as('e').outV().values('organization').as('1').select('e').inV().values('organization').as('2').select('e').group().by(select('1', '2')).by(values('collaborationHours').sum()).unfold();

==>{1=engineering, 2=marketing}=2
==>{1=marketing, 2=engineering}=2
==>{1=engineering, 2=sales}=3
==>{1=sales, 2=marketing}=2

Note, you have some leading spaces in your Gremlin on 'collaborationHours' I had to remove, and with the data you provided the engineering/sales total is 3, not 4.

Kevin 

On Wed, Dec 16, 2020 at 11:57 PM vishnu gajendran <gg...@...> wrote:

Hello,

I request your help regarding the janus graph query which I am trying to construct. Let's consider the following graph where each vertex denotes a person and the edge between any two vertex denotes collaboration between them.

Vertices:

p1 = graph.addVertex('person')

p1.property('personId', 1)

p1.property('organization', "engineering")

p2 = graph.addVertex('person')

p2.property('personId', 2)

p2.property('organization', "sales")

p3 = graph.addVertex('person')

p3.property('personId', 3)

p3.property('organization', "marketing")

p4 = graph.addVertex('person')

p4.property('personId', 4)

p4.property('organization', "engineering")

Edges:

p1.addEdge('collaboration', p2, 'collaborationHours', 1)

p1.addEdge('collaboration', p3, 'collaborationHours', 2)

p2.addEdge('collaboration', p3, 'collaborationHours', 2)

p3.addEdge('collaboration', p4, ' collaborationHours', 2)

p4.addEdge('collaboration', p2, ' collaborationHours', 2)

Expected Result is the following table:

Organization1  Organization2 Total Collaboration Hours
Engineering      Sales                 4
Engineering      Marketing         2
Sales                 Marketing          2
Marketing         Engineering       2

Here, I am trying to aggregate the "person to person" graph into "organization to organization" graph. Does JanusGraph support such aggregation queries? If yes, can you please help me with the query for the same?

Thanks

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