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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4582) Allow FlinkKinesisConsumer to adapt for AWS DynamoDB Streams
Date Sun, 25 Nov 2018 19:13:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16698253#comment-16698253

ASF GitHub Bot commented on FLINK-4582:

tweise 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_r236085780

 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.
+	 */
 Review comment:
   Remove these and remove the `@Deprecated` annotations from the prior properties.

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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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