Questions Regarding the Non-Display of the Engine Page with KyuubiHistoryServerPlugin

[Echan0808]

I am encountering an issue when using the KyuubiHistoryServerPlugin. After a Kyuubi task completes, I am unable to see the "Kyuubi Query Engine" tab on the history page.

I have performed multi-step verification to troubleshoot this:

Verified the SPARK_HOME used by the History Server.
Used the arthas sc command to confirm class loading.
Added logging points within the FsHistoryProvider.getAppUI method during the plugin.setupUI(ui) call, and all behaviors appear normal.
However, I noticed the following:

Image 1 shows that sessionCount is used to determine if there are sessions in an online state.
Image 2 indicates that after an app ends, no sessions should remain online.
When I removed the sessionCount judgment logic, everything returned to normal.

I am unsure whether this is a bug, a misuse on my part, or caused by another factor. Could you please help confirm this? I would greatly appreciate your assistance! 🙏

[pan3793]

sounds like a bug, cc @wForget

[Echan0808]

Sorry, this is an issue rooted in our history. A few years ago, there was a change in some underlying implementation logic, and initially, we didn’t realize it was an internal introduction. We sincerely apologize for this, and thank you for your understanding.