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Re: Setting an allowable number of checkpoint failures


Hi,

What we are looking for is that the job does *not* restart on transient
checkpoint failures and we would like to cap the number of allowable
subsequent failures until a restart occurs.

The reason is that every restart is a service interruption that is
potentially very expensive.

Thanks,
Thomas







On Mon, Aug 6, 2018 at 5:09 AM vino yang <yanghua1127@xxxxxxxxx> wrote:

> Hi Till,
>
> I think the way you proposed is a solution. But I think we also can provide
> a solution to prevent Checkpoint from failing indefinitely, in case the Job
> does not fail.
>
> Instead, a threshold is given to allow the checkpoint to fail a few times.
> When this threshold is reached, we decide to let the job fail.
>
> Thanks, vino.
>
> 2018-08-06 15:14 GMT+08:00 Till Rohrmann <trohrmann@xxxxxxxxxx>:
>
> > Hi Lakshmi,
> >
> > you could somewhat achieve the described behaviour by setting
> > setFailOnCheckpointintErrors(true) and using the
> > FailureRateRestartStrategy
> > as the restart strategy. That way checkpoint failures will trigger a job
> > restart (this is the downside) which is handled by the restart strategy.
> > The FailureRateRestartStrategy allows for x failures to happen within in
> a
> > given time interval. If this number is exceeded, then the job will
> > terminally fail.
> >
> > Cheers,
> > Till
> >
> > On Sat, Aug 4, 2018 at 4:58 AM vino yang <yanghua1127@xxxxxxxxx> wrote:
> >
> > > Hi Lakshmi,
> > >
> > > Your understanding of "
> > > *CheckpointConfig#setFailOnCheckpointingErrors(false)*" is correct, If
> > this
> > > is set to false, the task will only decline a the checkpoint and
> continue
> > > running.
> > >
> > > I think it is also a good choice to allow a number of failures to be
> set.
> > > Flink currently only supports whether the Task fails if the checkpoint
> > > fails. It is not supported to configure a threshold.
> > >
> > > You can create an issue in JIRA to feedback this requirement.
> > >
> > > Thanks, vino.
> > >
> > > 2018-08-04 4:28 GMT+08:00 Lakshmi Gururaja Rao <lrao@xxxxxxxx>:
> > >
> > > > Hi,
> > > >
> > > > We are running into intermittent checkpoint failures while
> > checkpointing
> > > to
> > > > S3.
> > > >
> > > > As described in this thread -
> > > >  http://apache-flink-user-mailing-list-archive.2336050.
> > > > n4.nabble.com/1-5-some-thing-weird-td21309.html
> > > > <http://apache-flink-user-mailing-list-archive.2336050.
> > > > n4.nabble.com/1-5-some-thing-weird-td21309.html>,
> > > > we see that the job restarts when it encounters such a failure.
> > > >
> > > > As mentioned in the thread, I see that there is an option to not fail
> > > tasks
> > > > on checkpoint errors -
> > > > *CheckpointConfig#setFailOnCheckpointingErrors(false)**. *However,
> > this
> > > > would mean that the job would continue running even in the case of
> > > > persistent checkpoint failures. Is my understanding here correct?
> > > >
> > > > If above is true, then is there a way to configure an allowable
> number
> > of
> > > > checkpoint failures? i.e. something along the lines of "Don't fail
> the
> > > job
> > > > if there are <=X number of checkpoint failures", so that *only
> > *transient
> > > > failures can be ignored.
> > > >
> > > > Thanks,
> > > > Lakshmi
> > > >
> > >
> >
>