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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2017/08/28 10:50:00 UTC
[jira] [Updated] (SPARK-10216) Avoid creating empty files during
overwrite into Hive table with group by query
[ https://issues.apache.org/jira/browse/SPARK-10216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon updated SPARK-10216:
---------------------------------
Fix Version/s: 2.3.0
> Avoid creating empty files during overwrite into Hive table with group by query
> -------------------------------------------------------------------------------
>
> Key: SPARK-10216
> URL: https://issues.apache.org/jira/browse/SPARK-10216
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Keuntae Park
> Assignee: Hyukjin Kwon
> Priority: Minor
> Fix For: 2.3.0
>
>
> Exchange from GROUP BY query results in at least certain amount of partitions specified in 'spark.sql.shuffle.partition'.
> Hence, even when the number of distinct group-by key is small,
> INSERT INTO with GROUP BY query try to make at least 200 files (default value of 'spark.sql.shuffle.partition'),
> which results in lots of empty files.
> I think it is undesirable because upcoming queries on the resulting table will also make zero size partitions and unnecessary tasks do nothing on handling the queries.
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