How to load a graphml file into a remote instance of Janusgraph, from a local gremlin-console

0
votes

How to load a graphml file into a remote instance of Janusgraph, from a local gremlin-console

Eventually, I want to create JanusGraph on a remote VM but for this PoT, I've created a local docker image with

docker run --rm --name janusgraph-default janusgraph/janusgraph:latest

Which works fine. I then started gremlin-console with:

docker run --rm --link janusgraph-default:janusgraph -e GREMLIN_REMOTE_HOSTS=janusgraph \ -it janusgraph/janusgraph:latest ./bin/gremlin.sh

This also works fine. On the gremlin-console I ran

:remote connect tinkerpop.server conf/remote.yaml

Then

:> g.addV('person').property('name', 'chris')

to test it had worked, I ran :> g.V().values('name') which returned chris

Having (I think) proved that gremlin-console can control the gremlin-server in the docker image, I wanted to import K Lawrence's air-routes-latest.graphml, with a view to trying to create some CRUD operations in Node.js

All the docs I can find only deal with local import and not remote

I tried:

:> graph.io(graphml()).readGraph("/home/me/Downloads/air-routes.graphml"), which returned

/home/me/Downloads/air-routes.graphml (No such file or directory)

Stack Trace:

Display stack trace? [yN]y
java.io.FileNotFoundException: /home/greg/Downloads/air-routes.graphml (No such file or directory)
        at java.io.FileInputStream.open0(Native Method)
        at java.io.FileInputStream.open(FileInputStream.java:195)
        at java.io.FileInputStream.<init>(FileInputStream.java:138)
        at java.io.FileInputStream.<init>(FileInputStream.java:93)
        at org.apache.tinkerpop.gremlin.structure.io.graphml.GraphMLIo.readGraph(GraphMLIo.java:91)
        at org.apache.tinkerpop.gremlin.structure.io.Io$readGraph.call(Unknown Source)
        at Script5.run(Script5.groovy:1)
        at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:674)
        at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:376)
        at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233)
        at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:266)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

I'm confident that's really where it is (on the same machine as the console) but it made me wonder whether the import has a context of the remote server (in this case the docker image, but potentially a remote VM) or the local console? I can't find any help to shine a light on this help, please?

 Gremlin.version()
==>3.4.4

gremlin-console janusgraph tinkerpop gremlin

2
gremlintinkerpopjanusgraph

2 Answers

3
votes

At this time, Gremlin io() does not work in this fashion. When your io() step is evaluated it uses the local file system where it is executed to do its work. In your case, you have a docker container running on the same system, so you could technically do what you are asking I think but I would think that the Docker container would need to be configured to mount /home/greg/Downloads/ in such a fashion that it would be available to it. Docker will be isolated to it's own file space otherwise. I think you need a Docker volume or bind mount to get this working properly.

1
votes

Following Stephen's response, I tried the following, which worked:

Setting up Janusgraph server to import air-routes.graphml

bash terminal 1 (su):

docker run --name janusgraph-default --volume /home/greg/Downloads/gremlin:/dataImports janusgraph/janusgraph:latest

(if necessary, remove a clashing container with docker container stop <pid> )

This mounts the native folder /home/greg/Downloads/gremlin as /dataImports in the image, so the air-routes.graphml file can be imported (you'll need to download from this link and substitute your own native file path to the download) It's a useful graphml data-set to play with. Read about it here and here.

To run the import, open a new bash terminal 2 (su):

docker run --rm --link janusgraph-default:janusgraph -e GREMLIN_REMOTE_HOSTS=janusgraph -it janusgraph/janusgraph:latest ./bin/gremlin.sh

This links to the janusgraph server (no port binding required) and opens the gremlin-console.

On the console, run:

:remote connect tinkerpop.server conf/remote.yaml

Then import the graphml file with

:> graph.io(graphml()).readGraph("/dataImports/air-routes.graphml")

It should return null. Once it has, run queries like:

:> g.V().has('airport','code','DFW').values()