Gopal V commented on TEZ-2161:

Yes, move from Counter::increment to Counter::update as polymorphism.

> Support CRDT aggregation models for counters 
> ---------------------------------------------
>                 Key: TEZ-2161
>                 URL: https://issues.apache.org/jira/browse/TEZ-2161
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Hitesh Shah
>            Assignee: Eric Wohlstadter
>            Priority: Major
> Some counters such as last event received time need to be handled different 
> to say bytes read counters. Bytes reads requires a summation across all tasks 
> within a vertex. The received time requires doing a max() across all the 
> tasks. First event received time would likely need a min().

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