[jira] [Commented] (SPARK-4489) JavaPairRDD.collectAsMap from checkpoint RDD may fail with ClassCastException

["Christopher Ng (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-4489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14217806#comment-14217806 ] 

Christopher Ng commented on SPARK-4489:
---------------------------------------

I should add there's a rather nasty looking workaround involving creating a ClassTag that is also in the Gist.

> JavaPairRDD.collectAsMap from checkpoint RDD may fail with ClassCastException
> -----------------------------------------------------------------------------
>
>                 Key: SPARK-4489
>                 URL: https://issues.apache.org/jira/browse/SPARK-4489
>             Project: Spark
>          Issue Type: Bug
>          Components: Java API
>    Affects Versions: 1.1.0
>            Reporter: Christopher Ng
>
> Calling collectAsMap() on a JavaPairRDD reconstructed from a checkpoint fails with a ClassCastException:
> Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Lscala.Tuple2;
> 	at org.apache.spark.rdd.PairRDDFunctions.collectAsMap(PairRDDFunctions.scala:595)
> 	at org.apache.spark.api.java.JavaPairRDD.collectAsMap(JavaPairRDD.scala:569)
> 	at org.facboy.spark.CheckpointBug.main(CheckpointBug.java:46)
> Code sample reproducing the issue: https://gist.github.com/facboy/8387e950ffb0746a8272



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