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Posted to dev@storm.apache.org by "Matthew Tieman (JIRA)" <ji...@apache.org> on 2015/03/02 22:52:05 UTC

[jira] [Created] (STORM-697) Support for Emitting Kafka Message Offset and Partition

Matthew Tieman created STORM-697:
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             Summary: Support for Emitting Kafka Message Offset and Partition
                 Key: STORM-697
                 URL: https://issues.apache.org/jira/browse/STORM-697
             Project: Apache Storm
          Issue Type: Improvement
          Components: storm-kafka
            Reporter: Matthew Tieman
            Assignee: Matthew Tieman


It would be nice expose the offset and partition of messages consumed from Kafka to the Scheme generating the Tuples. This is useful for auditing/replaying data from arbitrary points on a Kafka topic. There are a few ways to accomplish this. 

One is to define a new extension of Scheme, say MessageAndMetadataScheme, and add another case in KafkaUtils.generateTuples to determine if the config's schema is an instance of MessageAndMetadataScheme.

Another is add a flag to SpoutConfig indicating that the scheme should accept a byte array of MessageAndRealOffset.



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