Mithun Radhakrishnan created HIVE-17784:
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Summary: 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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