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I am installing JanusGraph on my computer (following the official guide) such that the data is stored on my computer which will also act like the client. I figured it would be best to use the Pre-Packaged Distribution (janusgraph-full-0.6.1.zip on the official JanusGraph repository) which is pre-configured with a sample Cassandra/Elastic Search configuration.

Once I have unzipped the file, if I want to launch JanusGraph (through bin/janusgraph.sh start), I obtain the following results:

> bin/janusgraph.sh start
Forking Cassandra...
Running `nodetool statusbinary`................... timeout exceeded (60 seconds)
See /<PATH_TO_JANUSGRAPH>/janusgraph-full-0.6.1/bin/../logs/cassandra.log for Cassandra log output.

While it says to see /<PATH_TO_JANUSGRAPH>/janusgraph-full-0.6.1/bin/../logs/cassandra.log for logs, there is no such file.

My thoughts were that this Distribution was able to work as a standalone, without any prior installation of Cassandra nor Elastic Search. Is it a misunderstanding on my part? If not, where does the timeout comes and how to fix it?

Thanks to everyone who will read it and take the time!

GregoirePelegrin
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1 Answers1

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Solution: Downgrade from whatever Java version you're using to Java 8

After some slight digging in the janusgraph.sh code I found the verbose option (which is exactly the same as everywhere, might be a good idea for next time):

>bin/janusgraph.sh -v start
Forking Cassandra...
Running `nodetool statusbinary`.[0.000s][warning][gc] -Xloggc is deprecated. Will use -Xlog:gc:/home/pelegrin/Documents/Progs/JanusGraph/janusgraph-full-0.6.1/bin/../cassandra/bin/../logs/gc.log instead.
intx ThreadPriorityPolicy=42 is outside the allowed range [ 0 ... 1 ]
Improperly specified VM option 'ThreadPriorityPolicy=42'
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

When researching intx ThreadPriorityPolicy=42 is outside the allowed range [ 0 ... 1 ] on Google, one of the first results is this stackoverflow question on Cassandra and Java 9, where it is said that downgrading the Java version to Java 8 is the simplest way to solve this error.

Indeed, after installing Java 8 and switching to this version (follow the answer here if needed) everything worked as expected!

GregoirePelegrin
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    Glad you figured it out! Which version of Cassandra is being run there? Cassandra 4 _will_ run on Java 11. – Aaron Jun 02 '22 at 15:21
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    I'll try and dive into the folders to find this, but I doubt it will be v4 as the Tested Compatibility section (https://github.com/JanusGraph/janusgraph/releases/tag/v0.6.1) indicates Apache Cassandra compatibilities with v3.0.14 and v3.11.10. – GregoirePelegrin Jun 02 '22 at 15:59
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    After further investigation, it seems that it indeed is Cassandra v3.11.10 that is being installed with the Pre-Packaged Distribution. – GregoirePelegrin Jun 02 '22 at 16:06