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https://issues.apache.org/jira/browse/TEZ-2161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14506741#comment-14506741
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Gopal V commented on TEZ-2161:
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The aggregations can be done consistently if and only if any two versions of
the counter group can be merged associatively & commutatively.
> 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
>
> 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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