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https://issues.apache.org/jira/browse/SPARK-12415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15074201#comment-15074201
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Andrew Or commented on SPARK-12415:
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Closed as Won't Fix. We can't use Kryo to serialize task result because there
are all these dependent classes in TaskMetrics. If the user adds one but
forgets to register it with Kryo then suddenly all apps with Kryo will fail.
This issue will be superseded by SPARK-12414.
> Do not use closure serializer to serialize task result
> ------------------------------------------------------
>
> Key: SPARK-12415
> URL: https://issues.apache.org/jira/browse/SPARK-12415
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.0.0
> Reporter: Andrew Or
>
> As the name suggests, closure serializer is for closures. We should be able
> to use the generic serializer for task results. If we want to do this we need
> to register `org.apache.spark.scheduler.TaskResult` if we use Kryo.
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