Stardog Server Startup Stalled at "Initializing virtual graph registry"

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1

This is related to an issue posted in the Develop Category: Stardog 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?

2

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

3

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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4

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

5

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.

6

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

7

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