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Posted to issues@spark.apache.org by "Sean R. Owen (Jira)" <ji...@apache.org> on 2022/08/31 17:39:00 UTC
[jira] [Commented] (SPARK-40200) unpersist cascades with Kryo, MEMORY_AND_DISK_SER and monotonically_increasing_id
[ https://issues.apache.org/jira/browse/SPARK-40200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17598532#comment-17598532 ]
Sean R. Owen commented on SPARK-40200:
--------------------------------------
I can't make out what this is reporting, please start over and explain the expected vs actual behavior clearly with as simple an example as possible
> unpersist cascades with Kryo, MEMORY_AND_DISK_SER and monotonically_increasing_id
> ---------------------------------------------------------------------------------
>
> Key: SPARK-40200
> URL: https://issues.apache.org/jira/browse/SPARK-40200
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 3.2.1, 3.3.0
> Environment: spark-3.3.0
> Reporter: Calvin Pietersen
> Priority: Major
>
> Unpersist of a parent dataset which has a column from _*monotonically_increasing_id*_ cascades to a child dataset when
> * joined on another dataset
> * kryo serialization is enabled
> * storage level is MEMORY_AND_DISK_SER
> * not all rows join????
>
> {code:java}
> import org.apache.spark.sql.functions.monotonically_increasing_id
> import org.apache.spark.storage.StorageLevel
> case class a(value: String, id: Long)
> val storageLevel = StorageLevel.MEMORY_AND_DISK_SER // cascades
> //val storageLevel = StorageLevel.MEMORY_ONLY // doesn't cascade
> val acc = sc.longAccumulator("acc")
> val parent1DS = spark.createDataset(Seq("a", "b", "c"))
> .withColumn("id", monotonically_increasing_id)
> .as[a]
> .persist(storageLevel)
> val parent2DS = spark.createDataset(Seq(1, 2, 3)) // 0,1,2 doesn't cascade
> .persist(storageLevel)
> val childDS = parent1DS.joinWith(parent2DS, parent1DS("id") === parent2DS("value"))
> .map(i =>{
> acc.add(1)
> i
> }).persist(storageLevel)
> childDS.count
> parent1DS.unpersist
> childDS.count
> acc.value should be(2) {code}
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