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klotz: performance* + spark* + etl* + orc*

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1. ORC Creation Best Practices - Hortonworks

   -set hive.exec.orc.split.strategy=ETL; -- this will work only for specific values scan, if full table scan will be required anyway, use default (HYBRID) or BI.

   2017-06-12 Tags: spark, hadoop, orc, hive, performance, tuning, etl, bi, hybrid by klotz

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