Flink Metric isBackPressured not available

[Claude Murad]

Hello, 

The documentation here https://ci.apache.org/projects/flink/flink-docs-stable/ops/metrics.html states there is a isBackPressured metric available yet I don't see it.  Any ideas why? 

Thanks

[Roman Khachatryan]

Hi,

The metric is registered upon task deployment and reported periodically.

Which Flink version are you using? The metric was added in 1.10.
Are you checking it in the UI?

Regards,
Roman

On Fri, Apr 9, 2021 at 8:50 PM Claude M <[hidden email]> wrote:
>
> Hello,
>
> The documentation here https://ci.apache.org/projects/flink/flink-docs-stable/ops/metrics.html states there is a isBackPressured metric available yet I don't see it.  Any ideas why?
>
>
> Thanks

[Claude Murad]

Thanks for your reply.  I'm using Flink 1.12.  I'm checking in Datadog and the metric is not available there.  

It has other task/operator metrics such as numRecordsIn/numRecordsOut there but not the isBackPressured. 

On Mon, Apr 12, 2021 at 8:40 AM Roman Khachatryan <[hidden email]> wrote:

Hi,

The metric is registered upon task deployment and reported periodically.

Which Flink version are you using? The metric was added in 1.10.
Are you checking it in the UI?

Regards,
Roman

On Fri, Apr 9, 2021 at 8:50 PM Claude M <[hidden email]> wrote:
>
> Hello,
>
> The documentation here https://ci.apache.org/projects/flink/flink-docs-stable/ops/metrics.html states there is a isBackPressured metric available yet I don't see it.  Any ideas why?
>
>
> Thanks

[David Anderson-4]

The isBackPressured metric is a Boolean -- it reports true or false, rather than 1 or 0. The Flink web UI can not display it (it shows NaN); perhaps the same is true for Datadog.

https://issues.apache.org/jira/browse/FLINK-15753 relates to this.

Regards,

David

On Tue, Apr 13, 2021 at 12:13 PM Claude M <[hidden email]> wrote:

Thanks for your reply.  I'm using Flink 1.12.  I'm checking in Datadog and the metric is not available there.  

It has other task/operator metrics such as numRecordsIn/numRecordsOut there but not the isBackPressured. 

On Mon, Apr 12, 2021 at 8:40 AM Roman Khachatryan <[hidden email]> wrote:

Hi,

The metric is registered upon task deployment and reported periodically.

Which Flink version are you using? The metric was added in 1.10.
Are you checking it in the UI?

Regards,
Roman

On Fri, Apr 9, 2021 at 8:50 PM Claude M <[hidden email]> wrote:
>
> Hello,
>
> The documentation here https://ci.apache.org/projects/flink/flink-docs-stable/ops/metrics.html states there is a isBackPressured metric available yet I don't see it.  Any ideas why?
>
>
> Thanks