Mithun Radhakrishnan created HIVE-17781:
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Summary: Map MR settings to Tez settings via DeprecatedKeys
Key: HIVE-17781
URL: https://issues.apache.org/jira/browse/HIVE-17781
Project: Hive
Issue Type: Bug
Components: Configuration, Tez
Affects Versions: 3.0.0
Reporter: Mithun Radhakrishnan
Assignee: Chris Drome
Here's one that [~cdrome] and [~thiruvel] worked on:
We found that certain Hadoop Map/Reduce settings that are set in site config
files do not take effect in Hive jobs, because the Tez site configs do not
contain the same settings.
In Yahoo's case, the problem was that, at the time, there was no mapping
between {{MRJobConfig.COMPLETED_MAPS_FOR_REDUCE_SLOWSTART}} and
{{TEZ_SHUFFLE_VERTEX_MANAGER_MAX_SRC_FRACTION}}. There were situations where
significant capacity on production clusters were being used up doing nothing,
while waiting for slow tasks to complete. This would have been avoided, were
the mappings in place.
Tez provides a {{DeprecatedKeys}} utility class, to help map MR settings to Tez
settings. Hive should use this to ensure that the mappings are in sync.
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