GREMLIN driver connection issue (Npetune)

[Kashifa Khursheed]

So, we have used gremlin driver to connect and query to Neptune instance in our application. And, this has been currently deployed to DEV instance, but we're facing issues with connectivity every now and then. This has been a recurring problem, and this is an issue with Gremlin driver for sure.

The recurring issue or error message encountered is:

Request Failed: Connection was closed by server.

Please have a look at the earliest or at least let us know of any fix for this bug.

[Stephen Akaeze]

My best guess is that AWS Neptune disconnects idle websockets after about 20mins. See the following link: https://docs.aws.amazon.com/neptune/latest/userguide/best-practices-gremlin-java-close-connections.html

Check the following

- Queries are well balanced across all existing websocket connections.

- If you are using IAM authentication, ensure your V4 signing for the connections are done correctly.

- Add retry logic/cleanup logic for your web socket connection pool.

Hope that helps. 

[Kashifa Khursheed]

Sure, but I tried adding a back-off strategy for 5 max retries and it is still showing the same "Connection was closed by server" error after re-trying for 5 times. So, I believe this is happening because exhaustible number of connections are being opened and not closed appropriately. I wanted to know how to implement a connection pool here, so that the connection is returned back to pool when the function (sub-graph query) has run, and pick up an active connection from the pool when the function is starting to execute.

Regards.

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[Stephen Mallette]

what version of neptune is it and what version of the java driver are you using to connect to it?

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