question Re: Logs are unavailable because Application Timeline Service seems unhealthy and could not connect to the JobHistory server. in Support Questions

Logs are unavailable because Application Timeline Service seems unhealthy and could not connect to the JobHistory server.

Choolake — Tue, 21 Apr 2026 06:27:10 GMT

When we try to get YARN log from cloudera manager, it's shopiwng following

Logs are unavailable because Application Timeline Service seems unhealthy and could not connect to the JobHistory server.

Please help anyone?

Re: Logs are unavailable because Application Timeline Service seems unhealthy and could not connect to the JobHistory server.

DianaTorres — Fri, 16 Aug 2024 20:02:01 GMT

Hi! @Choolake

To help you get the best possible solution, I have tagged our CDP experts @venkatsambath @abdulpasithali @upadhyayk04 who may be able to assist you further.

Please keep us updated on your post, and we hope you find a satisfactory solution to your query.

Re: Logs are unavailable because Application Timeline Service seems unhealthy and could not connect to the JobHistory server.

venkatsambath — Fri, 16 Aug 2024 20:03:53 GMT

Can you clarify which version of CM and CDP you are using? And the full exception you notice in Cloudera Manager logs/UI?

Are you able to access application log using command line?

yarn logs -applicationId <appid>

Re: Logs are unavailable because Application Timeline Service seems unhealthy and could not connect to the JobHistory server.

Choolake — Tue, 20 Aug 2024 05:34:37 GMT

Yes. we can access application log using command line

version - 7.7.1

When we check the logs from UI, we can find full error msg as following.

"Logs are unavailable because Application Timeline Service seems unhealthy and could not connect to the JobHistory server."

Thank you!