Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/365
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GitHub user ymatsuda opened a pull request:
https://github.com/apache/kafka/pull/365
KAFKA-2694: Task Id
@guozhangwang
* A task id is now a class, ```TaskId```, that has a task group id and a
partition id fields.
* ```TopologyBuilder``` assigns a task group id to a top
