Github user shivaram commented on a diff in the pull request: https://github.com/apache/spark/pull/2851#discussion_r19746366 --- Diff: core/src/main/scala/org/apache/spark/storage/BlockId.scala --- @@ -30,12 +30,13 @@ import org.apache.spark.annotation.DeveloperApi * If your BlockId should be serializable, be sure to add it to the BlockId.apply() method. */ @DeveloperApi -sealed abstract class BlockId { +sealed abstract class BlockId extends Serializable { --- End diff -- Is there a reason to make this serializable ? There are subclasses which are explicitly marked as non serializable https://github.com/CodingCat/spark/blob/SPARK-3957/core/src/main/scala/org/apache/spark/storage/BlockId.scala#L89 @aarondav can probably comment ?
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