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Posted to issues@spark.apache.org by "caoxuewen (JIRA)" <ji...@apache.org> on 2018/07/31 11:21:00 UTC
[jira] [Created] (SPARK-24978) Add
spark.sql.fast.hash.aggregate.row.max.capacity to configure the capacity of
fast aggregation.
caoxuewen created SPARK-24978:
---------------------------------
Summary: Add spark.sql.fast.hash.aggregate.row.max.capacity to configure the capacity of fast aggregation.
Key: SPARK-24978
URL: https://issues.apache.org/jira/browse/SPARK-24978
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.0, 3.0.0
Reporter: caoxuewen
this pr add a configuration parameter to configure the capacity of fast aggregation.
Performance comparison:
/*
Java HotSpot(TM) 64-Bit Server VM 1.8.0_60-b27 on Windows 7 6.1
Intel64 Family 6 Model 94 Stepping 3, GenuineIntel
Aggregate w multiple keys: Best/Avg Time(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------
fasthash = default 5612 / 5882 3.7 267.6 1.0X
fasthash = config 3586 / 3595 5.8 171.0 1.6X
*/
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