Sunil created APEXMALHAR-2187:
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Summary: Kafka Input Operator supports retry for loading initial
offset
Key: APEXMALHAR-2187
URL: https://issues.apache.org/jira/browse/APEXMALHAR-2187
Project: Apache Apex Malhar
Issue Type: New Feature
Reporter: Sunil
Assignee: Sandesh
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.
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