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https://issues.apache.org/jira/browse/SPARK-22702?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sean Owen resolved SPARK-22702.
-------------------------------
Resolution: Invalid
This should start on the mailing list. I must say I'm not clear what you're
reporting. What's being printed? why do you not expect this output? is there a
simpler reproduction?
> Spark sql filter with size function(if exists) leads twice calculation
> ----------------------------------------------------------------------
>
> Key: SPARK-22702
> URL: https://issues.apache.org/jira/browse/SPARK-22702
> Project: Spark
> Issue Type: Question
> Components: SQL
> Affects Versions: 2.1.0
> Environment: jdk1.7.0_67
> spark-hive_2.11
> Reporter: chenfh5
> Priority: Minor
>
> I occur an issue about spark-sql. When obtaining a Dataset through some
> logics, I wish to persist this Dataset as it would be used many times in the
> future. However, when persisting it, the logic would be calculated twice.
> Therefore I make some local test to reproduce this issue, and it happens.
> I test in three filter function, and found that,
> .filter(col("id") > 10) //expect
> .filter(length(col("name")) > 4) //expect
> .filter(size(col("seq_name")) > 1) //unexpect if filter exist
> i.e., the twice calculation issue occurs when filter out result exists.
> h5. result image
> h6. expected
> !http://upload-images.jianshu.io/upload_images/2189341-51ee89377e7159ac.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240!
> h6. unexpected
> !http://upload-images.jianshu.io/upload_images/2189341-f87ee2047f0cf120.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240!
> h5. reproduce code
> {code:scala}
> import org.apache.hadoop.fs.{FileSystem, Path}
> import org.apache.spark.SparkConf
> import org.apache.spark.sql.functions._
> import org.apache.spark.sql.types._
> import org.apache.spark.sql.{Dataset, Row, SparkSession}
> object TwiceCalculationReproducer {
> private val separator = scala.reflect.io.File.separator
> private val dirName = new java.io.File("").getAbsolutePath + separator +
> "testOutput"
> System.setProperty("spark.app.name", "TestController")
> System.setProperty("spark.master", "local[2]")
> private val ss = SparkSession.builder().config(new
> SparkConf()).enableHiveSupport().getOrCreate()
> ss.sparkContext.hadoopConfiguration.set("fs.defaultFS", "file:///")
> private val sc = ss.sparkContext
> def main(args: Array[String]) {
> val fs = FileSystem.get(sc.hadoopConfiguration)
> fs.delete(new Path(dirName), true)
> Thread.sleep(1000)
> /*expected*/
> val tableRaw = Dims.df
> val tableNewExp = seqColumnGeneratorExcepted(tableRaw)
> tableNewExp.persist()
> tableNewExp.show(10, 100)
> /*unexpected*/
> Thread.sleep(1000)
> val tableNewUnexp = seqColumnGeneratorUnexpected(tableRaw)
> tableNewExp.persist()
> tableNewUnexp.show(10, 100)
> }
> /*normal*/
> def seqColumnGeneratorExcepted[T](ds: Dataset[T]) = {
> ds.withColumn("seq_name", seqTokenUdf(col("id"), col("name")))
> }
> /*abnormal*/
> def seqColumnGeneratorUnexpected[T](ds: Dataset[T]) = {
> seqColumnGeneratorExcepted(ds)
> .filter(col("id") > 10) //expect
> .filter(length(col("name")) > 4) //expect
> .filter(size(col("seq_name")) > 1) //unexpect if filter exist
> }
> /*validator udf*/
> def seqTokenUdf = udf {
> (id: Int, name: String) => {
> /*validator 1: console print*/
> println(name + "_" + id + "_" + System.currentTimeMillis())
> /*validator 2: write file in case of executor not printing console*/
> val fs = FileSystem.get(sc.hadoopConfiguration)
> fs.setWriteChecksum(false)
> val fileName = Seq(dirName, name + "_" +
> System.currentTimeMillis.toString) mkString separator
> fs.create(new Path(fileName))
> /*return*/
> Seq[String](name, System.currentTimeMillis().toString)
> }
> }
> /*test data mock*/
> object Dims {
> private val structTypes = StructType(Seq(
> StructField("id", IntegerType),
> StructField("name", StringType)
> ))
> private val data = List(
> Row(100, "file100"),
> Row(101, "file101"),
> Row(102, "file102")
> )
> private val rdd = sc.parallelize(data)
> val df = ss.createDataFrame(rdd, structTypes)
> }
> }
> {code}
> Is there any problem in the size() function?
> Kind regards,
> chenfh5
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