[Tinkerpop3] How to fetch the data from the step which is labeled in a map/filter lambda?

[Bharat Dighe]

Hi,

here is the sample data

gremlin> g=TitanFactory.build().set("storage.backend", "inmemory").open();

==>standardtitangraph[inmemory:[127.0.0.1]]

gremlin> v1=g.addVertex("x", "1", "y","2");

==>v[4144]

gremlin> v2=g.addVertex("x", "2", "y","3");

==>v[4280]

gremlin> v1.addEdge("has", v2);

==>e[1l2-374-2dx-3aw][4144-has->4280]

gremlin> g.tx().commit();

==>null

Here is the traversal

gremlin> g.traversal().V().as("x");

==>v[4144]

==>v[4280]

gremlin> g.traversal().V().as("x").map{t->println(t.sideEffects("x").toString())}

gremlin>

Am I doing something incorrect here? Can the sideEffects provide data from labeled step?

Bharat

[Daniel Kuppitz]

x is not a side-effect. Try this:

g.traversal().V().as("x").map{t->println(t.path("x").toString())}

Cheers,

Daniel

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[Marko Rodriguez]

Hi,

Kuppitz, your traversal will fail because PATH requirement isn’t provided. Instead do g.traversal().withPath()…

Also, in general, don’t do g.traversal() every time. Instead:

graph = Titan…

g = graph.traversal()

g.withPath().V().as(…)

g.V()….

etc.

HTH,

Marko.

http://markorodriguez.com

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[Bharat Dighe]

Thanks Guys.

This worked.

g.traversal().withPath().V().as("x").out().map{t->println(t.path("x").toString())}

Bhatat

http://markorodriguez.com

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[Kelvin Lawrence]

Hi Marko, given you just showed a use case of where with Path() was needed to solve a user's question, might I suggest that an example be added to the Tinkerpop 3.2 docs. I just check the docs and other than in the API docs I could not see withPath() mentioned anywhere and even in the API docs there is zero English prose explaining it that I could see in a quick look.

Cheers

Kelvin

http://markorodriguez.com

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[Marko Rodriguez]

Hello,

It would be nice if we had a GraphTraversal Sources section like we have a GraphTraversal Steps section. There we would have:

withPath()

withSideEffect()

withSack()

withBulk()

withStrategies()

withoutStrategies()

…

etc.

…explained much like the we do for steps. If anyone would like to provide a pull request, I’d be more than happy to review, tweak, and graphic-out such a contribution.

Thanks,

Marko.

http://markorodriguez.com

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[Stephen Mallette]

I expanded the scope of an existing JIRA ticket as a reminder to handle the various with...() methods:

https://issues.apache.org/jira/browse/TINKERPOP-1115

http://markorodriguez.com

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[Bharat Dighe]

Hi Marko,

How to use "withPath" with traversals which begins with a vertex.

__.__(v).has("type", "type1").as("x").out().map{t->println(t.path("x").toString())}

Thanks

Bharat

On Tuesday, August 16, 2016 at 12:45:30 PM UTC-7, Marko A. Rodriguez wrote:

http://markorodriguez.com

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[Marko Rodriguez]

You really should never use an anonymous traversal like that as you don’t get any strategies applied to it. You should do:

g.withPath().V(v).has("type", "type1").as("x").out().map{t->println(t.path("x").toString())}

HTH,

Marko.

http://markorodriguez.com

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[Bharat Dighe]

I am observing, when withPath() is used, it does not make use of index. Anything I am missing here?

(Should I post in titan google group?)

==>com.thinkaurelius.titan.graphdb.database.management.TitanGraphIndexWrapper
gremlin> titanMgmt.getGraphIndex("by_name").getFieldKeys();
==>name

public static void main(String[] args) {

BaseConfiguration conf = new BaseConfiguration();

conf.setProperty("storage.backend", "cassandra");

conf.setProperty("storage.hostname", "localhost");

conf.setProperty("storage.port", 9160);

conf.setProperty("cache.db-cache", false);

conf.setProperty("storage.cassandra.keyspace", "my_ks");

@SuppressWarnings("resource")

TitanGraph graph = TitanFactory.open(conf);

System.out.println("Without withPath() ..");

System.out.println(graph.traversal().V().has("name", "xyz").count().next().longValue());

System.out.println("with withPath() ..");

System.out.println(graph.traversal().withPath().V().has("name", "xyz").count().next().longValue());

graph.close();

}

Output:

Without withPath() ..

5

with withPath() ..

22:04:54,236  WARN StandardTitanTx:1262 - Query requires iterating over all vertices [()]. For better performance, use indexes

22:04:54,246  INFO ThriftKeyspaceImpl:745 - Detected partitioner org.apache.cassandra.dht.Murmur3Partitioner for keyspace my_ks

5

Thanks

Bharat