Re: Ability to read adjacent vertex properties in vertex program


HadoopMarc <bi...@...>
 

Hi Anjani,

In a VertexProgram you cannot read properties from neighbouring vertices using the ComputerAdjacentVertex. You have to pass data between vertices explicitly using the messenger object in the execute method of the VertexProgram:
https://github.com/apache/tinkerpop/blob/3.4.8/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/computer/VertexProgram.java

Best wishes,  Marc

Op dinsdag 17 november 2020 om 15:42:02 UTC+1 schreef anj...@...:

Hi All,

In our graph, related nodes are connected to a master node. So as part of vertex program i was thinking to just get all master nodes and from master node get all connected nodes. 
So finally output should be like below and i should be able to read properties from derived list of vertices.

 [MasterNode] -> List of connected nodes, ex :
  V(masternode)  -> [ V(a), V(b), V(c)]

I noticed  vertex.inVertex() returns ComputerAdjacentVertex and it does not have properties, all properties are dropped.

Is there any way to read  adjacent vertex properties in vertex program? Please note i am not using adjacent vertex property for any traversal logic but want to read just as part of final result.

Thanks,
Anjani

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