Re: kinesis producer setCustomPartitioner use stream's own data

[Sathi Chowdhury <Sa...@elliemae.com>]

Thanks Gordon,
It was simple to resolve.
Best,
Sathi

From: "Tzu-Li (Gordon) Tai" <tz...@apache.org>
Reply-To: "user@flink.apache.org" <us...@flink.apache.org>
Date: Monday, February 20, 2017 at 11:46 PM
To: "user@flink.apache.org" <us...@flink.apache.org>
Subject: Re: kinesis producer setCustomPartitioner use stream's own data

Hi Sathi,

The `getPartitionId` method is invoked with each record from the stream. In there, you can extract values / fields from the record, and use that to determine the target partition id.

Is this what you had in mind?

Cheers,
Gordon


On February 21, 2017 at 11:54:21 AM, Sathi Chowdhury (sathi.chowdhury@elliemae.com<ma...@elliemae.com>) wrote:
Hi flink users and experts,

In my flink processor I am trying to use Flink Kinesis connector . I read from a kinesis stream , and After the transformation (for which I use RichCoFlatMapFunction), json event needs to sink to a kinesis stream k1.

DataStream<ObjectNode> myStream = see.addSource(new FlinkKinesisConsumer<>(inputStream, new MyDeserializationSchema(), consumerConfig));


For setting up the producer including partitioning I want to use setCustompartitioner , but the problem is that I don’t know how to access a parameters inside myStream , I have multiple fields that I want to extract from the stream  right there in the main method and use them in deciding the partition key. is possible to choose a partition key that is prepared from the stream ? if so can you please share an example.



kinesis.setCustomPartitioner(new KinesisPartitioner<String>() {
    @Override
    public String getPartitionId(String element) {
        int l = element.length();   /// here I want to bring values extracted from the stream
        return element.substring(l - 1, l);
    }
});

Thanks
Sathi
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