Re: Different number of running queries in Queries and Backends pages in Impala web UI

[Artem Akinin <ar...@glowbyte.ru>]

Hello!

Thank you for answer.

As I researched and understand «Num Queries Admitted by this Coordinator» is
number of queries that was started to do real things. Impala has a queue where
queries are waiting before start. So «Num Queries Admitted by this
Coordinator» doesn't know about queries in the queue. That is why «Num Queries
Admitted by this Coordinator» could be lower that «Queries in Flight» some
times

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Кому: user@impala.apache.org (user@impala.apache.org);

Тема: Different number of running queries in Queries and Backends pages in
Impala web UI;

27.03.2026, 01:18, "Michael Smith" <mi...@cloudera.com>:

> One option is that some queries are still being analyzed and no backends
> have started. Or that some backends have completed but the query is still
> waiting on other backends or the client.
>
> It's hard to be certain without more details.
>
> On Mon, Mar 16, 2026 at 1:51 AM Artem Akinin
> <[artem.akinin@glowbyte.ru](mailto:artem.akinin@glowbyte.ru)> wrote:
>

>> Hello!

>>

>> I couldn't figure out why number of queries in flight in The Queries page
of the web UI is different from «Num Queries Admitted by this Coordinator» in
The Backends page sometimes. I understand that in the Impala code that numbers
are in different variables, and they updates in different logic. But aren't
they supposed to be equals? Can you help to explain the difference?

>>

>> With regards, Artem

>>

>> p.s. Sorry for duplication. I subscribed to mail-list in first time