mridulm commented on a change in pull request #31876:
URL: https://github.com/apache/spark/pull/31876#discussion_r617221199
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File path: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala
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@@ -28,16 +28,23 @@ import org.apache.spark.internal.config
import org.apache.spark.storage.BlockManagerId
import org.apache.spark.util.Utils
+trait Location extends Externalizable {
Review comment:
To clarify: `Externalizable` takes precedence over `Serializable`.
We can continue to use `Externalizable` for `BlockManagerId` while not
requiring other implementations to necessarily require it.
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