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https://issues.apache.org/jira/browse/HIVE-22312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16991807#comment-16991807
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Pulkit Sharma commented on HIVE-22312:
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[~jcamachorodriguez] Please take a look.
> MapJoinCounterHook doesnot work for tez
> ---------------------------------------
>
> Key: HIVE-22312
> URL: https://issues.apache.org/jira/browse/HIVE-22312
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: All Versions
> Reporter: Pulkit Sharma
> Assignee: Pulkit Sharma
> Priority: Major
> Attachments: HIVE-22312.01.patch, HIVE-22312.02.patch,
> HIVE-22312.03.patch
>
>
> In [HIVE-1792|https://issues.apache.org/jira/browse/HIVE-1792],
> MapJoinCounterHook hook was added to track joins that get converted to map
> join. This hook gets List of Tasks from hookContext and check Tag associated
> with each task. For mr, we create Conditional tasks in case of joins and add
> tags for respective join conversions. This does not work in case of tez as we
> only create TezTask(no Conditional Task is created) which can handle multiple
> joins in contrast to one Conditional Task per join in mr.
> The current approach will fail even if we add tag to TezTask as it can have
> multiple joins of the same type which will require counter.
> One possible solution for tez, is to parse query-plan after query completion
> which we get from hookContext to get workGraph. Using workGraph, we can walk
> through Operator Tree to find join conversions.
> If this approach looks good, I can raise Pull Request
> cc [~ashutoshc] [~jcamachorodriguez] [~pxiong]
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