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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2020/09/08 01:41:00 UTC
[jira] [Assigned] (SPARK-32813) Reading parquet rdd in non columnar
mode fails in multithreaded environment
[ https://issues.apache.org/jira/browse/SPARK-32813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-32813:
------------------------------------
Assignee: (was: Apache Spark)
> Reading parquet rdd in non columnar mode fails in multithreaded environment
> ---------------------------------------------------------------------------
>
> Key: SPARK-32813
> URL: https://issues.apache.org/jira/browse/SPARK-32813
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Environment: Spark 3.0.0, Scala 2.12.12
> Reporter: Vladimir Klyushnikov
> Priority: Major
>
> Reading parquet rdd in non columnar mode (i.e. with list fields) if Spark session was created in one thread and rdd is being read in another - so InheritableThreadLocal with active session is not propagated. Code below was working perfectly in Spark 2.X, but fails in Spark 3
> {code:scala}
> import java.util.concurrent.Executors
> import org.apache.spark.sql.SparkSession
> import scala.concurrent.{Await, ExecutionContext, Future}
> import scala.concurrent.duration._
> object Main {
> final case class Data(list: List[Int])
> def main(args: Array[String]): Unit = {
> val executor1 = Executors.newSingleThreadExecutor()
> val executor2 = Executors.newSingleThreadExecutor()
> try {
> val ds = Await.result(Future {
> val session = SparkSession.builder().appName("test").master("local[*]").getOrCreate()
> import session.implicits._
> val path = "test.parquet"
> session.createDataset(Data(1 :: Nil) :: Nil).write.parquet(path)
> session.read.parquet(path).as[Data]
> }(ExecutionContext.fromExecutorService(executor1)), 1.minute)
> Await.result(Future {
> ds.rdd.collect().foreach(println(_))
> }(ExecutionContext.fromExecutorService(executor2)), 1.minute)
> } finally {
> executor1.shutdown()
> executor2.shutdown()
> }
> }
> }
> {code}
> This code fails with following exception:
> {code}
> Exception in thread "main" java.util.NoSuchElementException: None.getException in thread "main" java.util.NoSuchElementException: None.get at scala.None$.get(Option.scala:529) at scala.None$.get(Option.scala:527) at org.apache.spark.sql.execution.FileSourceScanExec.needsUnsafeRowConversion$lzycompute(DataSourceScanExec.scala:178) at org.apache.spark.sql.execution.FileSourceScanExec.needsUnsafeRowConversion(DataSourceScanExec.scala:176) at org.apache.spark.sql.execution.FileSourceScanExec.doExecute(DataSourceScanExec.scala:462) at org.apache.spark.sql.execution.SparkPlan.$anonfun$execute$1(SparkPlan.scala:175) at org.apache.spark.sql.execution.SparkPlan.$anonfun$executeQuery$1(SparkPlan.scala:213) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.sql.execution.SparkPlan.executeQuery(SparkPlan.scala:210) at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:171) at org.apache.spark.sql.execution.DeserializeToObjectExec.doExecute(objects.scala:96) at org.apache.spark.sql.execution.SparkPlan.$anonfun$execute$1(SparkPlan.scala:175) at org.apache.spark.sql.execution.SparkPlan.$anonfun$executeQuery$1(SparkPlan.scala:213) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.sql.execution.SparkPlan.executeQuery(SparkPlan.scala:210) at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:171) at org.apache.spark.sql.execution.QueryExecution.toRdd$lzycompute(QueryExecution.scala:122) at org.apache.spark.sql.execution.QueryExecution.toRdd(QueryExecution.scala:121) at org.apache.spark.sql.Dataset.rdd$lzycompute(Dataset.scala:3198) at org.apache.spark.sql.Dataset.rdd(Dataset.scala:3196)
> {code}
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