Help with GraphComputer.vertices() Filter

[John J. Szucs]

In a unit test, I have a graph that contains 7 vertices with label A and 48 vertices with label B. I need to run a GraphComputer VertexProgram over vertices with label A only, so I do this:

Traversal<Vertex, Vertex> vertices=graph.traversal().V().hasLabel("labelA");
GraphComputer computer=graph.compute().vertices(vertices);
VertexProgram<Double> program=new MyVertexProgram();
ComputerResult result=computer.program(program).submit().get();

The unit test fails as follows:

org.janusgraph.core.JanusGraphException: Failed to process [48] vertices in vertex program iteration [1]. Computer is aborting.

Note that 48 in the exception message is exactly the number of vertices (with label B) that I intentionally filtered out.

I strongly suspect I am misunderstanding the API, as I am fairly new to Gremlin (but not Blueprints).

Can anyone offer advice on how to do this correctly? Thanks in advance!

-- John

[Daniel Kuppitz]

vertices() takes an anonymous traversal. This should work for you:

graph.compute().vertices(__.hasLabel("labelA"));

Cheers,

Daniel

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[John J. Szucs]

Daniel,

Thanks for the response. Unfortunately, I get the same result: a JanusGraphException indicating that the GraphComputer failed to process 48 vertices.

-- John

On Friday, January 5, 2018 at 12:56:39 PM UTC-5, Daniel Kuppitz wrote:

vertices() takes an anonymous traversal. This should work for you:

graph.compute().vertices(__.hasLabel("labelA"));

Cheers,

Daniel

On Fri, Jan 5, 2018 at 9:21 AM, John J. Szucs <john.j...@gmail.com> wrote:

In a unit test, I have a graph that contains 7 vertices with label A and 48 vertices with label B. I need to run a GraphComputer VertexProgram over vertices with label A only, so I do this:

Traversal<Vertex, Vertex> vertices=graph.traversal().V().hasLabel("labelA");
GraphComputer computer=graph.compute().vertices(vertices);
VertexProgram<Double> program=new MyVertexProgram();
ComputerResult result=computer.program(program).submit().get();

The unit test fails as follows:

org.janusgraph.core.JanusGraphException: Failed to process [48] vertices in vertex program iteration [1]. Computer is aborting.

Note that 48 in the exception message is exactly the number of vertices (with label B) that I intentionally filtered out.

I strongly suspect I am misunderstanding the API, as I am fairly new to Gremlin (but not Blueprints).

Can anyone offer advice on how to do this correctly? Thanks in advance!

-- John

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To unsubscribe from this group and stop receiving emails from it, send an email to janusgraph-use...@googlegroups.com.

[Daniel Kuppitz]

Hmm, I don't think that has anything to do with the filter. Have you tried a different vertex program, e.g. PageRankVertexProgram?

Cheers,

Daniel

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[mikio.t...@gmail.com]

Hi,

I am wondering how this problem has been resolved.

I have the same issue with JanusGraph 0.3.1.  The same filters work with TinkerGraph.

The filters are something like as follows.  I applied one filter at once.

VERTEX and VERTEX_IDX are Strings. VERTEX is defined as vertex label for JanusGraph.

computer.vertices(__.hasLabel(VERTEX));
computer.vertices(__.has(VERTEX_IDX));
computer.vertices(__.has(VERTEX_IDX, P.eq(0L)));
computer.vertices(__.has(VERTEX_IDX, P.test((a,b)->((Long) a) % 2 == 0L, 0L)));

I appreciate any suggestions.

-- Mikio Takeuchi

2018年1月6日土曜日 5時35分09秒 UTC+9 Daniel Kuppitz: