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https://issues.apache.org/jira/browse/SPARK-23185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16717956#comment-16717956
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ASF GitHub Bot commented on SPARK-23185:
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srowen commented on issue #20356: [SPARK-23185][SQL] Make the configuration
"spark.default.parallelism" can be changed on each SQL session to decrease
empty files
URL: https://github.com/apache/spark/pull/20356#issuecomment-446350850
Yeah this isn't the right fix. It's 'default' parallelism after all. This
would potentially increase the number of output files in other situations, and
also create empty files, like when there are fewer rows than default
parallelism.
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> Make the configuration "spark.default.parallelism" can be changed on each SQL
> session to decrease empty files
> -------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-23185
> URL: https://issues.apache.org/jira/browse/SPARK-23185
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.1
> Reporter: LvDongrong
> Priority: Minor
>
> When execute "insert into ... values ...", many empty files will be
> generated.We can change the configuration "spark.default.parallelism" to
> decrease the number of empty files.But there are many occasions that we want
> to chang the configuration during each session so as not to influence other
> sql sentences, like we may use thrift server to excute many sql sentences on
> a SQL session.
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