Failed with gremlin traversal on Edge operation

[zxnblake]

HI @seanbarzilay:

I am trying the gremlin traversal with unipop-elastic. I can load data from ES into graph, and the code < graph.traversal().V("1").next().value("name") > is working well, but the following code is not working:
GraphTraversal<Edge, Edge> et = graph.traversal().E("1");
Edge edges = et.next();
It always throws out the following error:
java.util.NoSuchElementException
org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.next(DefaultTraversal.java:204)
at org.unipop.elastic.tests.ConfigurationTests.upsertConfiguration(ConfigurationTests.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
When I debug into the code(ElasticClient.execute(action)), I can see that the query for edge with id=1 is successful, and I can see the following search result with json:
{"took":1,"timed_out":false,"_shards":{"total":1,"successful":1,"failed":0},"hits":{"total":1,"max_score":1.0,"hits":[{"_index":"edge","_type":"default","_id":"1","_score":1.0,"_source":{"inVertex":{"ref":"true","id":"548","label":"person"},"label":"knows","outVertex":{"ref":"true","id":"1","label":"person"}}}]}}
It seems that the edge and its inVertex and outVertex have been fetched from ES store already.
Why it always failed in executing the et.next(); or et.inV().next()?

[zxnblake]

I have found the issue: we should provide the "outId" and "inId" property in the edge mapping both in config file and the edge index in ES. The code will try to find the outId/inId property when forming an edge in the graph.
The following is my current config file ( I am using the embedded ES in Crate ):
{
"class": "org.unipop.elastic.ElasticSourceProvider",
"clusterName": "crate",
"addresses": "http://localhost:4200",
"vertices": [
{
"index": "vertex",
"type": "default",
"id": "@_id",
"label": "person",
"properties": {
},
"dynamicProperties": true
}
],
"edges": [
{
"index": "edge",
"type": "default",
"id": "@_id",
"label": "knows",
"properties": {
},
"dynamicProperties": {
},
"outVertex": {
"ref": true,
"id": "",
"label": "person",
"properties": {}
},
"inVertex": {
"ref": true,
"id": "",
"label": "person",
"properties": {}
}
}
]
}

[seanbarzilay]

@zxnblake I didn't understand you completely but in your mapping file you haven't provide id properties for both inVertex and outVertex

[zxnblake]

Sorry for the wrong config file.. The following one is working:

{
"class": "org.unipop.elastic.ElasticSourceProvider",
"clusterName": "jiesi-crate-userprofile",
"addresses": "http://172.28.235.41:20100",
"vertices": [
{
"index": "user_profile_jsf_jim",
"type": "default",
"id": "@_id",
"label": "@_type",
"properties": {
},
"dynamicProperties": true
}
],
"edges": [
{
"index": "user_relation",
"type": "knows",
"id": "@_id",
"label": "@_type",
"outId": "",
"inId": "",
"properties": {
},
"dynamicProperties": {
"excludeFields": ["outId", "inId"]
},
"outVertex": {
"ref": true,
"id": "@outid",
"label": "default",
"properties": {}
},
"inVertex": {
"ref": true,
"id": "inId",
"label": "default",
"properties": {}
}
}
]
}

[seanbarzilay]

You're missing a "@" in your inVertex id property