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From "Jay Kreps (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-183) Expose offset vector to the consumer
Date Tue, 01 Nov 2011 20:27:32 GMT
Expose offset vector to the consumer
------------------------------------

                 Key: KAFKA-183
                 URL: https://issues.apache.org/jira/browse/KAFKA-183
             Project: Kafka
          Issue Type: New Feature
            Reporter: Jay Kreps
            Assignee: Jay Kreps


We should enable consumers to save their position themselves. This would be useful for consumers
that need to store consumed data so they can store the data and the position together, this
gives a poor man's "transactionality" since any data loss on the consumer will also rewind
the position to the previous position so the two are always in sync.

Two ways to do this:
1. Add an OffsetStorage interface and have the zk storage implement this. The user can override
this by providing an OffsetStorage implementation of their own to change how values are stored.
2. Make commit() return the position offset vector and add a setPosition(List<Long>)
method to initialize the position.

Let's figure out any potential problems with this, and work out the best approach.

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