[jira] [Created] (KAFKA-1012) Implement an Offset Manager and hook offset requests to it

["Tejas Patil (JIRA)" <ji...@apache.org>]

Tejas Patil created KAFKA-1012:
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             Summary: Implement an Offset Manager and hook offset requests to it
                 Key: KAFKA-1012
                 URL: https://issues.apache.org/jira/browse/KAFKA-1012
             Project: Kafka
          Issue Type: Sub-task
          Components: consumer
            Reporter: Tejas Patil
            Assignee: Tejas Patil
            Priority: Minor


After KAFKA-657, we have a protocol for consumers to commit and fetch offsets from brokers. Currently, consumers are not using this API and directly talking with Zookeeper. 

This Jira will involve following:
1. Add a special topic in kafka for storing offsets
2. Add an OffsetManager interface which would handle storing, accessing, loading and maintaining consumer offsets
3. Implement offset managers for both of these 2 choices : existing ZK based storage or inbuilt storage for offsets.
4. Leader brokers would now maintain an additional hash table of offsets for the group-topic-partitions that they lead
5. Consumers should now use the OffsetCommit and OffsetFetch API

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