drill-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Tomer Shiran <tshi...@dremio.com>
Subject Parquet read optimization
Date Thu, 15 Oct 2015 06:16:46 GMT
Why is the Parquet read optimization not on by default?

Optimizing Reads of Parquet-Backed Tables

Use the store.hive.optimize_scan_with_native_readers option to optimize
reads of Parquet-backed external tables from Hive. When set to TRUE, this
option uses Drill native readers instead of the Hive Serde interface,
resulting in more performant queries of Parquet-backed external tables.
(Drill 1.2 and later)

Set the store.hive.optimize_scan_with_native_readers option as described in
the section, "Planning and Execution Options"

  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message