Re: [DISCUSS] Replace Attempt column with Attempt Number on the subtask list page of the Web UI

[Gen Luo <lu...@gmail.com>]

Hi user mail list,

I'm also forwarding this thread to you. Please let me know if you have any
comments or feedback!

Best,
Gen

On Wed, Jul 20, 2022 at 4:25 PM Zhu Zhu <re...@gmail.com> wrote:

> Thanks for starting this discussion, Gen!
> I agree it is confusing or even troublesome to show an attempt id that is
> different from the corresponding attempt number in REST, metrics and logs.
> It adds burden to users to do the mapping in troubleshooting. Mis-mapping
> can be easy to happen and result in a waste of efforts and wrong
> conclusion.
>
> Therefore, +1 for this proposal.
>
> Thanks,
> Zhu
>
> Gen Luo <lu...@gmail.com> 于2022年7月20日周三 15:24写道：
> >
> > Hi everyone,
> >
> > I'd like to propose a change on the Web UI to replace the Attempt column
> > with an Attempt Number column on the subtask list page.
> >
> > From the very beginning, the attempt number shown is calculated at the
> > frontend by subtask.attempt + 1, which means the attempt number shown on
> > the web UI is not the same as it is in the runtime, as well as the logs
> and
> > the metrics. Users may get confused since they can't find logs or metrics
> > of the subtask with the same attempt number.
> >
> > Fortunately, by now the users don't need to care about the attempt
> number,
> > since there can be only one attempt of each subtask. However, the
> confusion
> > seems inevitable once the speculative execution[1] or the attempt history
> > is introduced, since multiple attempts of the same subtask can be
> executed
> > or presented at the same time.
> >
> > I suggest that the attempt number shown on the web UI should be changed
> to
> > align that on the runtime side, which is used in logging and metrics
> > reporting. To avoid confusion, the column should also be renamed as
> > "Attempt Number". The changes should only affect the Web UI. No REST API
> > needs to change. What do you think?
> >
> > [1]
> >
> https://cwiki.apache.org/confluence/display/FLINK/FLIP-168%3A+Speculative+Execution+for+Batch+Job
> >
> > Best,
> > Gen
>