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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