Getting error while connecting Dremio via Apache Arrow flight

1

Hi, I am trying to use Apache Arrow flight in our spring-boot application to connect Dremio, it was working fine, but after sometime we found “User Session is not available in the cache” error message while connecting to dremio. After i restart our microservice it started working. Not able to identify where and what is the issue. Appreciate a help. Thanks.

2

Hi @s.ranjan0404 ,

Thanks for sending over the additional details. What version of Maven are you running and does this error occur with Dremio Software or Dremio Cloud?

Cindy

@hope

3

Additionally, do you have a rough idea of how long before you receive that error? Is it 120 minutes? Our documentation mentions this for Flight Sessions for both Dremio Software and Cloud:

A Flight session has a duration of 120 minutes during which a Flight client interacts with Dremio Cloud.

https://docs.dremio.com/cloud/arrow-flight/arrow-flight/#flight-sessions (Dremio Cloud)
Developing Arrow Flight Client Applications for Dremio | Dremio Documentation (Dremio Software)

You can change the duration on Dremio Software by modifying usersessions.ttl.seconds in the dremio.conf file per above Software link.

Dremio Cloud currently only supports 120 minutes.

4

Hi @cindy.la,

Thanks for the information. In our code some how i was initializing multiple flightClients for one request. i have changed the code and will keep under observation. Will let you know if i get the same issue again.

Regards,
Soumya Ranjan

5

Thanks for reporting it s.ranjan0404!
Same here, but after few seconds which is quite annoying.
Using the JAVA Flight Client (not JDBC) didn’t time out so far. Therefore I think it’s not a Server config problem.