Arun C Murthy created TEZ-1528:
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Summary: Native support for multi cluster aggregations
Key: TEZ-1528
URL: https://issues.apache.org/jira/browse/TEZ-1528
Project: Apache Tez
Issue Type: New Feature
Reporter: Arun C Murthy
Increasingly, data-sets are partitioned across clusters due to legal or
operational considerations. An e.g. is a 'customer-activity' table with
partitions for the same 'date', but sub-partitions located in the clusters
across which raw data cannot be moved/copied due to legal considerations.
It would be nice to have Tez support aggregations across these clusters by
providing native support for cross-cluster 'sub-dags' (think auto transform of
mapper-reducer to mapper-combiner-reducer split across clusters), 'edge' with
*strict* limits on data-transfer across clusters etc. Providing such a
primitive would make it relatively easier for Hive, Pig etc. to provide SQL
queries, ETL applications etc. across clusters.
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