[APEXMALHAR-2086] Kafka Output Operator with Kafka 0.9 API

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.5.0
• Assignee: Sandesh Hegde
• Reporter: Sandesh Hegde
• Created: 11/May/16 21:39
• Updated: 08/Oct/16 04:38
• Resolved: 02/Sep/16 15:25

Description

Goal : 2 Operartors for Kafka Output

1. Simple Kafka Output Operator

• Supports Atleast Once
• Expose most used producer properties as class properties

2. Exactly Once Kafka Output ( Not possible in all the cases, will be documented later )

Design for Exactly Once

Window Data Manager - Stores the Kafka partitions offsets.
Kafka Key - Used by the operator = AppID#OperatorId

During recovery. Partially written window is re-created using the following approach:

Tuples between the largest recovery offsets and the current offset are checked. Based on the key, tuples written by the other entities are discarded.

Only tuples which are not in the recovered set are emitted.

Tuples needs to be unique within the window.

Issue Links

• relates to: APEXMALHAR-2283 Issues with Kafka output operator
• links to: GitHub Pull Request #298
• links to: GitHub Pull Request #298