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Re: Consuming data from dynamoDB streams to flink


Hi Ying,

Sorry for the late reply here.

>From the looks of the AmazonDynamoDBStreamsClient, yes it seems like this
should simply work.

Regarding the resharding behaviour I mentioned in the JIRA:
I'm not sure if this is really a difference in behaviour. Internally, if
DynamoDB streams is actually just working on Kinesis Streams, then the
resharding primitives should be similar.
The shard discovery logic of the Flink Kinesis Consumer assumes that
splitting / merging shards will result in new shards of increasing,
consecutive shard ids. As long as this is also the behaviour for DynamoDB
resharding, then we should be fine.

Feel free to start with the implementation for this, I think design-wise
we're good to go. And thanks for working on this!

Cheers,
Gordon

On Wed, Jul 4, 2018 at 1:59 PM Ying Xu <yxu@xxxxxxxx> wrote:

> HI Gordon:
>
> We are starting to implement some of the primitives along this path. Please
> let us know if you have any suggestions.
>
> Thanks!
>
> On Fri, Jun 29, 2018 at 12:31 AM, Ying Xu <yxu@xxxxxxxx> wrote:
>
> > Hi Gordon:
> >
> > Really appreciate the reply.
> >
> > Yes our plan is to build the connector on top of the
> FlinkKinesisConsumer.
> > At the high level, FlinkKinesisConsumer mainly interacts with Kinesis
> > through the AmazonKinesis client, more specifically through the following
> > three function calls:
> >
> >    - describeStream
> >    - getRecords
> >    - getShardIterator
> >
> > Given that the low-level DynamoDB client (AmazonDynamoDBStreamsClient)
> > has already implemented similar calls, it is possible to use that client
> to
> > interact with the dynamoDB streams, and adapt the results from the
> dynamoDB
> > streams model to the kinesis model.
> >
> > It appears this is exactly what the AmazonDynamoDBStreamsAdapterClient
> > <
> https://github.com/awslabs/dynamodb-streams-kinesis-adapter/blob/master/src/main/java/com/amazonaws/services/dynamodbv2/streamsadapter/AmazonDynamoDBStreamsAdapterClient.java
> >
> > does. The adaptor client implements the AmazonKinesis client interface,
> > and is officially supported by AWS.  Hence it is possible to replace the
> > internal Kinesis client inside FlinkKinesisConsumer with this adapter
> > client when interacting with dynamoDB streams.  The new object can be a
> > subclass of FlinkKinesisConsumer with a new name e.g,
> FlinkDynamoStreamCon
> > sumer.
> >
> > At best this could simply work. But we would like to hear if there are
> > other situations to take care of.  In particular, I am wondering what's
> the *"resharding
> > behavior"* mentioned in FLINK-4582.
> >
> > Thanks a lot!
> >
> > -
> > Ying
> >
> > On Wed, Jun 27, 2018 at 10:43 PM, Tzu-Li (Gordon) Tai <
> tzulitai@xxxxxxxxxx
> > > wrote:
> >
> >> Hi!
> >>
> >> I think it would be definitely nice to have this feature.
> >>
> >> No actual previous work has been made on this issue, but AFAIK, we
> should
> >> be able to build this on top of the FlinkKinesisConsumer.
> >> Whether this should live within the Kinesis connector module or an
> >> independent module of its own is still TBD.
> >> If you want, I would be happy to look at any concrete design proposals
> you
> >> have for this before you start the actual development efforts.
> >>
> >> Cheers,
> >> Gordon
> >>
> >> On Thu, Jun 28, 2018 at 2:12 AM Ying Xu <yxu@xxxxxxxx> wrote:
> >>
> >> > Thanks Fabian for the suggestion.
> >> >
> >> > *Ying Xu*
> >> > Software Engineer
> >> > 510.368.1252 <+15103681252>
> >> > [image: Lyft] <http://www.lyft.com/>
> >> >
> >> > On Wed, Jun 27, 2018 at 2:01 AM, Fabian Hueske <fhueske@xxxxxxxxx>
> >> wrote:
> >> >
> >> > > Hi Ying,
> >> > >
> >> > > I'm not aware of any effort for this issue.
> >> > > You could check with the assigned contributor in Jira if there is
> some
> >> > > previous work.
> >> > >
> >> > > Best, Fabian
> >> > >
> >> > > 2018-06-26 9:46 GMT+02:00 Ying Xu <yxu@xxxxxxxx>:
> >> > >
> >> > > > Hello Flink dev:
> >> > > >
> >> > > > We have a number of use cases which involves pulling data from
> >> DynamoDB
> >> > > > streams into Flink.
> >> > > >
> >> > > > Given that this issue is tracked by Flink-4582
> >> > > > <https://issues.apache.org/jira/browse/FLINK-4582>. we would like
> >> to
> >> > > check
> >> > > > if any prior work has been completed by the community.   We are
> also
> >> > very
> >> > > > interested in contributing to this effort.  Currently, we have a
> >> > > high-level
> >> > > > proposal which is based on extending the existing
> >> FlinkKinesisConsumer
> >> > > and
> >> > > > making it work with DynamoDB streams (via integrating with the
> >> > > > AmazonDynamoDBStreams API).
> >> > > >
> >> > > > Any suggestion is welcome. Thank you very much.
> >> > > >
> >> > > >
> >> > > > -
> >> > > > Ying
> >> > > >
> >> > >
> >> >
> >>
> >
> >
>


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