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From "Dyana Rose (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8267) Kinesis Producer example setting Region key
Date Fri, 15 Dec 2017 20:57:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16293231#comment-16293231

Dyana Rose commented on FLINK-8267:

a push towards the native keys in the docs would simplify things greatly and make it much
easier for people who already use the KCL and KPL in other applications.

I'm not too proud to say I spent way too much time today navigating through the layers of
config abstraction to try to understand how the KCL and KPL were attempting to share settings.

> Kinesis Producer example setting Region key
> -------------------------------------------
>                 Key: FLINK-8267
>                 URL: https://issues.apache.org/jira/browse/FLINK-8267
>             Project: Flink
>          Issue Type: Bug
>          Components: Kinesis Connector
>            Reporter: Dyana Rose
>            Assignee: Bowen Li
>            Priority: Minor
> https://ci.apache.org/projects/flink/flink-docs-release-1.4/dev/connectors/kinesis.html#kinesis-producer
> In the example code for the kinesis producer the region key is set like:
> {code:java}
> producerConfig.put(AWSConfigConstants.AWS_REGION, "us-east-1");
> {code}
> However, the AWS Kinesis Producer Library requires that the region key be Region (https://github.com/awslabs/amazon-kinesis-producer/blob/94789ff4bb2f5dfa05aafe2d8437d3889293f264/java/amazon-kinesis-producer-sample/default_config.properties#L269)
so the setting at this point should be:
> {code:java}
> producerConfig.put(AWSConfigConstants.AWS_REGION, "us-east-1");
> producerConfig.put("Region", "us-east-1");
> {code}
> When you run the Kinesis Producer you can see the effect of not setting the Region key
by a log line
> {noformat}
> org.apache.flink.streaming.connectors.kinesis.FlinkKinesisProducer  - Started Kinesis
producer instance for region ''
> {noformat}
> The KPL also then assumes it's running on EC2 and attempts to determine it's own region,
which fails.
> {noformat}
> (EC2MetadataClient)Http request to Ec2MetadataService failed.
> [error] [main.cc:266] Could not configure the region. It was not given in the config
and we were unable to retrieve it from EC2 metadata
> {noformat}
> At the least I'd say the documentation should mention the difference between these two
keys and when you are required to also set the Region key.
> On the other hand, is this even the intended behaviour of this connector? Was it intended
that the AWSConfigConstants.AWS_REGION key also set the region of the of the kinesis stream?
The documentation for the example states 
> {noformat}
> The example demonstrates producing a single Kinesis stream in the AWS region “us-east-1”.
> {noformat}

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