Thanks a lot for the update Tomasz and keep up posted if it happens again.

Kostas

On Fri, Jul 24, 2020 at 6:37 PM Tomasz Dudziak <t.dudz...@mwam.com> wrote:
>
> Yes, the job was running and the REST server as well. No JobMaster failures 
> noticed.
> I used a test cluster deployed on a bunch of VM's and bare metal boxes.
> I am afraid, I can no longer reproduce this issue. It occurred a couple days 
> ago and lasted for an entire day with jobs being quite often erratically 
> reported as Not Found. As I said, I noticed that another query immediately 
> after the one that returned Not Found consistently returned a correct result.
> It had never occurred before and I am afraid now I could no longer observe it 
> again. I appreciate it does not give too much information so I will come back 
> with more info on this thread if it happens again.
>
> -----Original Message-----
> From: Kostas Kloudas <kklou...@gmail.com>
> Sent: 24 July 2020 15:46
> To: Tomasz Dudziak <t.dudz...@mwam.com>
> Cc: user@flink.apache.org; Chesnay Schepler <ches...@apache.org>
> Subject: Re: REST API randomly returns Not Found for an existing job
>
> Hi Tomasz,
>
> Thanks a lot for reporting this issue. If you have verified that the job is 
> running AND that the REST server is also up and running (e.g.
> check the overview page) then I think that this should not be happening. I am 
> cc'ing Chesnay who may have an additional opinion on this.
>
> Cheers,
> Kostas
>
> On Thu, Jul 23, 2020 at 12:59 PM Tomasz Dudziak <t.dudz...@mwam.com> wrote:
> >
> > Hi,
> >
> >
> >
> > I have come across an issue related to GET /job/:jobId endpoint from 
> > monitoring REST API in Flink 1.9.0. A few seconds after successfully 
> > starting a job and confirming its status as RUNNING, that endpoint would 
> > return 404 (Not Found). Interestingly, querying immediately again 
> > (literally a millisecond later) would return a valid result. I later 
> > noticed a similar behaviour in regard to a finished job as well. At certain 
> > points in time that endpoint would arbitrarily return 404, but similarly 
> > querying again would succeed. I saw this strange behaviour only recently 
> > and it used to work fine before.
> >
> >
> >
> > Do you know what could be the root cause of this? At the moment, as a
> > workaround I just query a job a couple of times in a row to ensure
> > whether it definitely does not exist or it is just being misreported
> > as non-existent, but this feels a bit like cottage industry…
> >
> >
> >
> > Kind regards,
> >
> > Tomasz
> >
> >
> >
> > Tomasz Dudziak | Marshall Wace LLP, George House, 131 Sloane Street,
> > London, SW1X 9AT | E-mail: t.dudz...@mwam.com | Tel: +44 207 024 7061
> >
> >
> >
> >
> >
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