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KAFKA-2763: better stream task assignment
guozhangwang When the rebalance happens each consumer reports the following information to the coordinator. * Client UUID (a unique id assigned to an instance of KafkaStreaming) * Task ids of previously running tasks * Task ids of valid local states on the client's state directory TaskAssignor does the following * Assign a task to a client which was running it previously. If there is no such client, assign a task to a client which has its valid local state. * Try to balance the load among stream threads. * A client may have more than one stream threads. The assignor tries to assign tasks to a client proportionally to the number of threads. Author: Yasuhiro Matsuda <yasuhiro@confluent.io> Reviewers: Guozhang Wang Closes #497 from ymatsuda/task_assignment
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