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https://issues.apache.org/jira/browse/SPARK-31764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118201#comment-17118201
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Jungtaek Lim commented on SPARK-31764:
--------------------------------------

For me this looks to be a bug - the description of PR states the same. Is there 
a reason this issue is marked as an "improvement" and the fix only landed to 
master branch? 

The bug is also placed in branch-3.0: 
https://github.com/apache/spark/blob/branch-3.0/core/src/main/scala/org/apache/spark/util/JsonProtocol.scala

> JsonProtocol doesn't write RDDInfo#isBarrier
> --------------------------------------------
>
>                 Key: SPARK-31764
>                 URL: https://issues.apache.org/jira/browse/SPARK-31764
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 3.1.0
>            Reporter: Kousuke Saruta
>            Assignee: Kousuke Saruta
>            Priority: Major
>             Fix For: 3.1.0
>
>
> JsonProtocol read RDDInfo#isBarrier but doesn't write it.



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