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Posted to issues@spark.apache.org by "Vladimir Klyushnikov (Jira)" <ji...@apache.org> on 2020/09/07 16:32:00 UTC
[jira] [Created] (SPARK-32813) Reading parquet rdd in non columnar
mode fails in multithreaded environment
Vladimir Klyushnikov created SPARK-32813:
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Summary: 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
Reporter: Vladimir Klyushnikov
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._
session.createDataset(Data(1 :: Nil) :: Nil).write.parquet("test.parquet")
session.read.parquet("test.parquet").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:
{noformat}
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){noformat}
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