Stardog Server Startup Stalled at "Initializing virtual graph registry"

This is related to an issue posted in the Develop Category: SarDog server startup issue

I'm seeing this issue with an instance that is running on Ubuntu 18.04 with stardog 7.6.3 installed via the debian installer. I started seeing this issue after having an out of memory error when querying a large virtual graph.

Here is the error I saw:

INFO  2021-05-11 18:11:44,888 [main] com.complexible.stardog.virtual.DefaultVirtualGraphRegistry:syncCache(494): Initializing virtual graph registry

I let the server try to startup and it was pinned at 100% on 1 cpu for over 4 hours. Even using -v the only output I saw was the above in stardog.log .

Any thoughts on how to debug this?

Hi Nolan,

Sorry for the delayed response. The jstack command will provide some details to analyze this. Are you still experiencing this error? Can you reproduce it? If possible, a backup of your home directory should allow us to reproduce it.

Jess

Thanks for reporting this Nolan. We have created the issue PLAT-2394 and will fix it in an upcoming release.

Jess

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Thanks, Jess. I ended up starting over, so no home directory to share, but it sounds like the issue may have been identified.

The other case we saw tens of thousands of tables in the data sources. I'm assuming it was similar in your case. When a virtual graph is created, the list of visible tables is retrieved from the data source.

that's correct, one of the data sources was Athena with many tables, though not tens of thousands.

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