Flink Streaming State Management

[Hilmi Yildirim]

Hi,
does Flink Streaming support state management? For example, I have a
state which will be used inside the streaming operations but the state
can be updated.

For example:
stream.map( use state for operation).updateState(update state).


Best Regards,
Hilmi




--
--
Hilmi Yildirim
Software Developer R&D


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[Matthias J. Sax]

Hi Hilmi,

currently, this is not supported. However, state management is already
work in progress and should be available soon. See
https://github.com/apache/flink/pull/747

-Matthias

On 06/17/2015 09:36 AM, Hilmi Yildirim wrote:

> Hi,
> does Flink Streaming support state management? For example, I have a
> state which will be used inside the streaming operations but the state
> can be updated.
>
> For example:
> stream.map( use state for operation).updateState(update state).
>
>
> Best Regards,
> Hilmi
>
>
>
>

[Gyula Fóra]

Hey Hilmi,

Flink currently supports user defined state through the Checkpointed interface. Using this interface the user can define what state should the system be aware of when doing snapshots for fault tolerance. The state returned in the snapshotState method will be checkpointed (and restored upon failure).

Currently there is no explicit update function so the user need to implement his state updates as part of the operator logic (inside the map function for instance). After the 0.9.0 we will change the state interfaces to have explicit update functions, you can preview some of the functionality in the PR Matthias referenced, or here is a document for a more detailed discussion of this feature: 

https://docs.google.com/document/d/1nTn4Tpafsnt-TCT6L1vlHtGGgRevU90yRsUQEmkRMjk/edit?usp=sharing

Cheers,

Gyula

Hilmi Yildirim <[hidden email]> ezt írta (időpont: 2015. jún. 17., Sze, 9:36):

Hi,
does Flink Streaming support state management? For example, I have a
state which will be used inside the streaming operations but the state
can be updated.

For example:
stream.map( use state for operation).updateState(update state).


Best Regards,
Hilmi




--
--
Hilmi Yildirim
Software Developer R&D


http://www.neofonie.de

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http://blog.neofonie.de/

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Handelsregister Berlin-Charlottenburg: HRB 67460
Geschäftsführung: Thomas Kitlitschko

[Hilmi Yildirim]

Hi Matthias,
great! Thank you.

Best Regards,
Hilmi

Am 17.06.2015 um 09:38 schrieb Matthias J. Sax:

> Hi Hilmi,
>
> currently, this is not supported. However, state management is already
> work in progress and should be available soon. See
> https://github.com/apache/flink/pull/747
>
> -Matthias
>
> On 06/17/2015 09:36 AM, Hilmi Yildirim wrote:
>> Hi,
>> does Flink Streaming support state management? For example, I have a
>> state which will be used inside the streaming operations but the state
>> can be updated.
>>
>> For example:
>> stream.map( use state for operation).updateState(update state).
>>
>>
>> Best Regards,
>> Hilmi
>>
>>
>>
>>

[Hilmi Yildirim]

Hi Gyula,
thank you.

Best Regards,
Hilmi

Am 17.06.2015 um 09:44 schrieb Gyula Fóra:

Hey Hilmi,

Flink currently supports user defined state through the Checkpointed interface. Using this interface the user can define what state should the system be aware of when doing snapshots for fault tolerance. The state returned in the snapshotState method will be checkpointed (and restored upon failure).

Currently there is no explicit update function so the user need to implement his state updates as part of the operator logic (inside the map function for instance). After the 0.9.0 we will change the state interfaces to have explicit update functions, you can preview some of the functionality in the PR Matthias referenced, or here is a document for a more detailed discussion of this feature: 

https://docs.google.com/document/d/1nTn4Tpafsnt-TCT6L1vlHtGGgRevU90yRsUQEmkRMjk/edit?usp=sharing

Cheers,

Gyula

Hilmi Yildirim <[hidden email]> ezt írta (időpont: 2015. jún. 17., Sze, 9:36):

Hi,
does Flink Streaming support state management? For example, I have a
state which will be used inside the streaming operations but the state
can be updated.

For example:
stream.map( use state for operation).updateState(update state).


Best Regards,
Hilmi




--
--
Hilmi Yildirim
Software Developer R&D


http://www.neofonie.de

Besuchen Sie den Neo Tech Blog für Anwender:
http://blog.neofonie.de/

Folgen Sie uns:
https://plus.google.com/+neofonie
http://www.linkedin.com/company/neofonie-gmbh
https://www.xing.com/companies/neofoniegmbh

Neofonie GmbH | Robert-Koch-Platz 4 | 10115 Berlin
Handelsregister Berlin-Charlottenburg: HRB 67460
Geschäftsführung: Thomas Kitlitschko

[rmetzger0]

Hey Hilmi,

here is a great example of how to use the Checkpointed interface: https://github.com/StephanEwen/flink-demos/blob/master/streaming-state-machine/src/main/scala/com/dataartisans/flink/example/eventpattern/StreamingDemo.scala#L82

On Wed, Jun 17, 2015 at 12:44 AM, Hilmi Yildirim <[hidden email]> wrote:

Hi Matthias,
great! Thank you.

Best Regards,
Hilmi

Am 17.06.2015 um 09:38 schrieb Matthias J. Sax:

Hi Hilmi,

currently, this is not supported. However, state management is already
work in progress and should be available soon. See
https://github.com/apache/flink/pull/747

-Matthias

On 06/17/2015 09:36 AM, Hilmi Yildirim wrote:

Hi,
does Flink Streaming support state management? For example, I have a
state which will be used inside the streaming operations but the state
can be updated.

For example:
stream.map( use state for operation).updateState(update state).


Best Regards,
Hilmi