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https://issues.apache.org/jira/browse/HIVE-17784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mithun Radhakrishnan reassigned HIVE-17784:
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> Make Tez AM's Queue headroom calculation and nParallel tasks configurable.
> --------------------------------------------------------------------------
>
> Key: HIVE-17784
> URL: https://issues.apache.org/jira/browse/HIVE-17784
> Project: Hive
> Issue Type: Bug
> Components: Query Planning, Tez
> Affects Versions: 2.2.0, 3.0.0
> Reporter: Mithun Radhakrishnan
> Assignee: Mithun Radhakrishnan
>
> Here's a couple of customizations we made at Yahoo with Hive Tez AMs:
> # When calculating splits, {{HiveSplitGenerator}} takes the entire queue's
> capacity as available, and generates splits accordingly. While this greedy
> algorithm might be acceptable for exclusive queues, on a shared queue, greedy
> queries will hold other queries up. The algorithm that calculates the queue's
> headroom should be pluggable. The greedy version can be the default.
> # {{TEZ_AM_VERTEX_MAX_TASK_CONCURRENCY}} and the AM's heap-size can be tuned
> separately from the AM's container size. We found that users who attempt to
> increase vertex concurrency tend to forget to bump AM memory/container sizes.
> It would be handier if those values were derived from the container size.
> I'm combining these into a single patch, for easier review.
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