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From Juho Autio <juho.au...@rovio.com>
Subject Re: Flink State monitoring
Date Fri, 20 Apr 2018 09:36:01 GMT
Hi Aljoscha & co.,

Is there any way to monitor the state size yet? Maybe a ticket in Jira?

When using incremental checkpointing, the total state size can't be seen
anywhere. For example the checkpoint details only show the size of the
increment. It would be nice to add the total size there as well. The only
way I know currently for figuring out the total state size is by triggering
a manual savepoint. But this doesn't work at all if the state has grown so
big that savepoint times out.

Also when Flink restores state from an incrementally created checkpoint, it
doesn't offer a way to see the total size.

On Thu, Jan 4, 2018 at 8:23 PM, Steven Wu <stevenz3wu@gmail.com> wrote:

> Aljoscha/Stefan,
>
> if incremental checkpoint is enabled, I assume the "checkpoint size" is
> only the delta/incremental size (not the full state size), right?
>
> Thanks,
> Steven
>
>
> On Thu, Jan 4, 2018 at 5:18 AM, Aljoscha Krettek <aljoscha@apache.org>
> wrote:
>
>> Hi,
>>
>> I'm afraid there is currently no metrics around state. I see that it's
>> very good to have so I'm putting it on my list of stuff that we should have
>> at some point.
>>
>> One thing that comes to mind is checking the size of checkpoints, which
>> gives you an indirect way of figuring out how big state is but that's not
>> very exact, i.e. doesn't give you "number of keys" or some such.
>>
>> Best,
>> Aljoscha
>>
>> > On 20. Dec 2017, at 08:09, Netzer, Liron <liron.netzer@citi.com> wrote:
>> >
>> > Ufuk, Thanks for replying !
>> >
>> > Aljoscha, can you please assist with the questions below?
>> >
>> > Thanks,
>> > Liron
>> >
>> > -----Original Message-----
>> > From: Ufuk Celebi [mailto:uce@apache.org]
>> > Sent: Friday, December 15, 2017 3:06 PM
>> > To: Netzer, Liron [ICG-IT]
>> > Cc: user@flink.apache.org
>> > Subject: Re: Flink State monitoring
>> >
>> > Hey Liron,
>> >
>> > unfortunately, there are no built-in metrics related to state. In
>> general, exposing the actual values as metrics is problematic, but exposing
>> summary statistics would be a good idea. I'm not aware of a good work
>> around at the moment that would work in the general case (taking into
>> account state restore, etc.).
>> >
>> > Let me pull in Aljoscha (cc'd) who knows the state backend internals
>> well.
>> >
>> > @Aljoscha:
>> > 1) Are there any plans to expose keyed state related metrics (like
>> number of keys)?
>> > 2) Is there a way to work around the lack of these metrics in 1.3?
>> >
>> > – Ufuk
>> >
>> > On Thu, Dec 14, 2017 at 10:55 AM, Netzer, Liron <liron.netzer@citi.com>
>> wrote:
>> >> Hi group,
>> >>
>> >>
>> >>
>> >> We are using Flink keyed state in several operators.
>> >>
>> >> Is there an easy was to expose the data that is stored in the state,
>> i.e.
>> >> the key and the values?
>> >>
>> >> This is needed for both monitoring as well as debugging. We would like
>> >> to understand how many key+values are stored in each state and also to
>> >> view the data itself.
>> >>
>> >> I know that there is the "Queryable state" option, but this is still
>> >> in Beta, and doesn't really give us what we want easily.
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> *We are using Flink 1.3.2 with Java.
>> >>
>> >>
>> >>
>> >> Thanks,
>> >>
>> >> Liron
>>
>>
>

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