[jira] [Commented] (FLINK-4582) Allow FlinkKinesisConsumer to adapt for AWS DynamoDB Streams

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-4582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16707635#comment-16707635 ] 

ASF GitHub Bot commented on FLINK-4582:
---------------------------------------

yxu-valleytider commented on a change in pull request #6968: [FLINK-4582] [kinesis] Consuming data from DynamoDB streams to flink
URL: https://github.com/apache/flink/pull/6968#discussion_r238386976
 
 

 ##########
 File path: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/config/ConsumerConfigConstants.java
 ##########
 @@ -143,6 +143,34 @@ public SentinelSequenceNumber toSentinelSequenceNumber() {
 	/** The interval after which to consider a shard idle for purposes of watermark generation. */
 	public static final String SHARD_IDLE_INTERVAL_MILLIS = "flink.shard.idle.interval";
 
+  /**
+	 * The base backoff time between each describeStream attempt.
+	 * Different tag name to distinguish from "flink.stream.describe.backoff.base"
+	 * since the latter is deprecated.
+	 */
+	public static final String DYNAMODB_STREAMS_DESCRIBE_BACKOFF_BASE =
 
 Review comment:
   @tweise  are you ok with removing this function `KinesisProxy::replaceDeprecatedConsumerKeys` as well ? 

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> Allow FlinkKinesisConsumer to adapt for AWS DynamoDB Streams
> ------------------------------------------------------------
>
>                 Key: FLINK-4582
>                 URL: https://issues.apache.org/jira/browse/FLINK-4582
>             Project: Flink
>          Issue Type: New Feature
>          Components: Kinesis Connector, Streaming Connectors
>            Reporter: Tzu-Li (Gordon) Tai
>            Assignee: Ying Xu
>            Priority: Major
>              Labels: pull-request-available
>
> AWS DynamoDB is a NoSQL database service that has a CDC-like (change data capture) feature called DynamoDB Streams (http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Streams.html), which is a stream feed of item-level table activities.
> The DynamoDB Streams shard abstraction follows that of Kinesis Streams with only a slight difference in resharding behaviours, so it is possible to build on the internals of our Flink Kinesis Consumer for an exactly-once DynamoDB Streams source.
> I propose an API something like this:
> {code}
> DataStream dynamoItemsCdc = 
>   FlinkKinesisConsumer.asDynamoDBStream(tableNames, schema, config)
> {code}
> The feature adds more connectivity to popular AWS services for Flink, and combining what Flink has for exactly-once semantics, out-of-core state backends, and queryable state with CDC can have very strong use cases. For this feature there should only be an extra dependency to the AWS Java SDK for DynamoDB, which has Apache License 2.0.



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