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So we only gonna assign learner task only to "new comers", which means every stream thread worker will denote itself as "new member" when they don't have local information. The assignment, however, will be on the 

Version 2.0

We will take task balance into consideration. Specifically for each instance, the total number of tasks it owns should be within the range of 0.5 ~ 2 times of the expected number of tasks, which buffers some capacity in order to avoid imbalanc

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