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https://issues.apache.org/jira/browse/SPARK-21105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-21105.
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Resolution: Duplicate
This is a duplicate of SPARK-10216.
> Useless empty files in hive table
> ---------------------------------
>
> Key: SPARK-21105
> URL: https://issues.apache.org/jira/browse/SPARK-21105
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.1
> Reporter: pin_zhang
> Priority: Minor
>
> case class Base(v: Option[Double])
> object EmptyFiles {
>
> def main(args: Array[String]): Unit = {
> val conf = new SparkConf().setAppName("scala").setMaster("local[12]")
> val ctx = new SparkContext(conf)
> val spark =
> SparkSession.builder().enableHiveSupport().config(conf).getOrCreate()
> val seq = Seq(Base(Some(1D)), Base(Some(1D)));
> val rdd = ctx.makeRDD[Base](seq)
> import spark.implicits._
>
> rdd.toDS().write.format("json").mode(SaveMode.Append).saveAsTable("EmptyFiles")
> }
> }
> // DataSet create many useless empty files for empty partition
> // if insert small RDD into the table many times, which result in too many
> empty files, which slow down the query.
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