Hi Marc - thank you for the reply.  I've written java code to take some data and use it to generate a graph.  After that data is put into JanusGraph, I then loop over all the nodes (in the graph) so that I can query an external database to add edges/nodes where appropriate for this particular task.  This is all in Java.

I've not used an OLAP query, but it looks like it's straight from Gremlin; so should be able to do it from Java?  Still investigating.

-Joe

On 5/11/2017 11:14 AM, HadoopMarc wrote:

Hi Joseph,

If you want to process all vertices (map operation) you need an OLAP query (currently only works for readonly tasks):
http://docs.janusgraph.org/latest/hadoop-tp3.html
http://tinkerpop.apache.org/docs/3.2.3/reference/#sparkgraphcomputer

If you want to filter the total set of vertices, you need an index on one or more properties of your vertices:
http://docs.janusgraph.org/latest/indexes.html

What do you want to accomplish apart from looping over the vertices in your graph?

HTH,   Marc

Op donderdag 11 mei 2017 16:18:50 UTC+2 schreef Joseph Obernberger:

Hi All - I'm using a loop to do a task on all vertices in fairly large
graph (million+ nodes), and the operation that I'm doing takes some
time.  I'm getting a
org.apache.hadoop.hbase.client.ScannerTimeoutException 20091230ms passed
since the last invocation, timeout is currently set to 60000.

Is there a better way to loop through all vertices besides something like:
-------------------
JanusGraphTransaction vertTrans = graph.newTransaction();
Iterator<Vertex> vertices = vertTran.vertices();

while (vertices != null && vertices.hasNext()) {
//do stuff
}
------------------

?

Thank you!

-Joe

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