[jira] [Created] (FLINK-3294) KafkaConsumer (0.8) commit offsets using SimpleConsumer.commitOffsets()

["Robert Metzger (JIRA)" <ji...@apache.org>]

Robert Metzger created FLINK-3294:
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             Summary: KafkaConsumer (0.8) commit offsets using SimpleConsumer.commitOffsets()
                 Key: FLINK-3294
                 URL: https://issues.apache.org/jira/browse/FLINK-3294
             Project: Flink
          Issue Type: Bug
          Components: Kafka Connector
            Reporter: Robert Metzger


Currently, the 0.8 consumer for Kafka is committing the offsets manually into Zookeeper so that users can track the lag using external tools.

The 0.8 consumer has a pluggable design, and this component is easily pluggable.
Since OffsetCommitRequest version=1 (supported in 0.8.2 or later), users can choose between two offset commit modes:
a) Let the broker commit into ZK (this is  what we are doing from the consumer
b) Let the broker commit the offset into a special topic.

By adding a different "OffsetHandler" backend, users can commit offsets from the brokers (reducing the total number of ZK connections) or into the broker's offset topic.



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