Running a Scala example


cd into your example folder and run the command below to start the Scala Build Tool.


Once you see either the > or sbt:example-lotr> prompt, it has loaded SBT.

You can now run compile to build the project. This should produce output similar to below if working correctly:

sbt:example-lotr> compile
[info] compiling 3 Scala sources to /Users/YOUR_USERNAME/github/Examples/raphtory-example-lotr/target/scala-2.13/classes ...
[success] Total time: 3 s, completed 2 Feb 2022, 13:30:49


To test that you have Raphtory working properly on your machine, use the command run.

sbt:example-lotr> run

From this you should get a request to select a main class (as can be seen below). We want to select the TutorialRunner.

Main Classes within the LOTR example

And you’re done! This will run the Lord of the Rings example that we will come back to in the next few tutorials.

Understanding the execution logs

First of all as Raphtory begins executing we should see some messages showing that the ingestion components of Raphtory are online and as such the system is ready for analysis to be performed. Don’t worry about what these are for the second, we will go through this in the next section.

Enter number: 1
[info] running com.raphtory.examples.lotrTopic.TutorialRunner
23:11:33.381 [run-main-0] INFO  com.raphtory.spouts.FileSpout - Spout: Processing file 'lotr.csv' ...
23:11:33.884 [] INFO  akka.event.slf4j.Slf4jLogger - Slf4jLogger started
23:11:34.808 [run-main-0] INFO - Creating '1' Partition Managers for raphtory_181811870.
23:11:34.856 [run-main-0] INFO - Creating new Query Manager.
23:11:34.862 [run-main-0] INFO - Created Graph object with deployment ID 'raphtory_181811870'.
23:11:34.862 [run-main-0] INFO - Created Graph Spout topic with name 'raphtory_data_raw_181811870'.

Next, we should see that our query has been submitted:

23:11:35.043 [run-main-0] INFO - Creating new Query Progress Tracker for 'DegreesSeparation_8822143620455242909'.
23:11:35.080 [] INFO  com.raphtory.internals.components.querymanager.QueryManager - Query 'DegreesSeparation_8822143620455242909' received, your job ID is 'DegreesSeparation_8822143620455242909'.
23:11:35.157 [monix-computation-138] INFO  com.raphtory.api.querytracker.QueryProgressTracker - Job DegreesSeparation_8822143620455242909: Starting query progress tracker.

Finally, once the data has completed ingesting, the query can run. The logs for this contain information about the Job ID, topics, perspectives, windows and the time it has taken to run.

23:11:37.247 [] INFO  com.raphtory.api.querytracker.QueryProgressTracker - Job 'DegreesSeparation_8822143620455242909': Perspective '32674' finished in 2202 ms.
23:11:37.247 [] INFO  com.raphtory.api.querytracker.QueryProgressTracker - Job DegreesSeparation_8822143620455242909: Running query, processed 1 perspectives.
23:11:37.255 [] INFO  com.raphtory.api.querytracker.QueryProgressTracker - Job DegreesSeparation_8822143620455242909: Query completed with 1 perspectives and finished in 2210 ms.

Checking your output

Once the query has finished executing Raphtory will not stop running. This is because we may submit more queries to the running instance, now that it has ingested the graph. However, you may now kill the Raphtory job and check out the output. For the example, results will be saved to /tmp/raphtory or the directory specified in the TutorialRunner class if you have changed it. Below is an example of the CSV file that has been output. This means that Raphtory is working as it should and you can move onto creating your first graph for analysis. The meaning of this output is only a couple pages away, so don’t threat if it looks a little odd right now!


Editing Raphtory core


If you are just building applications on top of Raphtory this section can be skipped as it discusses how to publish a new local version of Raphtory-core which can be used by your apps.

Once you have cloned the raphtory repo and made your changes you may build the new Raphtory jar and publish into the Maven folder on your local computer by running this command in your root Raphtory directory:

sbt "core/publishLocal"

If you are working on your application via Intellij you should give your sbt a refresh to reload the project locally and make sure it is using the new Raphtory jar. The button for this is the two rotating arrows located on the right hand side window within the sbt tab.

If you make any more changes to the core Raphtory code, you can go into your local ivy repo to delete the old jar and then re-publish using sbt "core/publishLocal". Alternatively, if you are making several iterative changes, you can add a dependency version := "0.1-SNAPSHOT" in the core build.sbt file and subsequent calls to sbt publishLocal will not require you to manually delete jars from your local repo. The Raphtory dependency in your project will need to be updated accordingly however.

cd ~/.ivy2/local/com.raphtory
rm (whichever jar you want to delete)