This is your weekly summary of Compose news for those changes and updates which can make your life easier. In this edition, we look at how Compose JanusGraph makes creating graphs easier and we look at the past week's Compose Articles.
A lot of users have had a look at JanusGraph on Compose, the Scylla-backed graph database, and they've been having a great time with it. But some people have been caught out by how we host the database and how that affects some of the JanusGraph commands.
TL;DR: Never use
JanusGraphFactory, always use
When you create a graph in a locally installed JanusGraph, you use
JanusGraphFacory. It uses the local filesystem to store information about how that graph is configured, no matter what backend database it is stored on. When hosting JanusGraph imaged containers, that kind of local storage is not really safe to use; it can be erased easily, even just by restarting the database and its hard to backup. With that in mind, the JanusGraph engineering team at IBM Compose created a new way to store that information - in the backend database and in its own graph.
Effectively, JanusGraph on Compose is hard wired to connect to the Scylla backend. This allows a new Graph Factory,
ConfiguredGraphFactory to use the backend to store all the graph metadata in a graph dedicated to configuration information. That means that when you create a graph with
ConfiguredGraphFactory there's no writing to local file systems and the metadata is backed up with the rest of the data making it much easier to manage.
An added bonus is that where
JanusGraphFactory accepts all sorts of configuration settings as parameters, all that's needed for a
ConfiguredGraphFactory is the name of your graph as a parameter.
One note though, when you do come to delete a graph from the
ConfiguredGraphFactory, with the current JanusGraph implementation, there's a couple of steps to removing the graph. Consult the documentation for details on how to do this.
In the last week, Compose Articles showed the latest functionality in the Bach command line tool, and rounded up the database and developer news from around the internet:
- Small changes make a big difference and in Hooked on Bach - Updating Compose's command line we looked at how transparently adding deployment name support made the handy command line tool for Compose databases even easier to use.
- In NewsBits this week, we looked at the Redis security issue, PostgreSQL installers, SQLite updates, a JIT for Ruby 2.6 and more to keep you right you to date.
That's the week in Noteworthy at Compose and now we're ready for another week!
Read more articles about Compose databases - use our Curated Collections Guide for articles on each database type. If you have any feedback about this or any other Compose article, drop the Compose Articles team a line at firstname.lastname@example.org. We're happy to hear from you.