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https://issues.apache.org/jira/browse/HIVE-15104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16201405#comment-16201405
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Rui Li commented on HIVE-15104:
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Hi [~xuefuz], sorry for taking so long to update. I tried out your proposal.
The idea is to build the trivial package and add it with the {{--jars}} config
when we launch the Spark app. So we need to locate the jar at runtime. To
locate the jar, we can use reflection to get the class and call
{{SparkContext.jarOfClass}} to get the URI. But since kryo is shaded, we don't
have {{com.esotericsoftware.kryo.Kryo}} in our class path on Hive side. When I
try to get the registrator class, I get a {{NoClassDefFoundError}} for
{{com.esotericsoftware.kryo.Kryo}}.
I guess one workaround is to let user specify the path to the jar, but that
seems not very friendly. Any suggestions?
> Hive on Spark generate more shuffle data than hive on mr
> --------------------------------------------------------
>
> Key: HIVE-15104
> URL: https://issues.apache.org/jira/browse/HIVE-15104
> Project: Hive
> Issue Type: Bug
> Components: Spark
> Affects Versions: 1.2.1
> Reporter: wangwenli
> Assignee: Rui Li
> Attachments: HIVE-15104.1.patch, HIVE-15104.2.patch,
> HIVE-15104.3.patch, HIVE-15104.4.patch, HIVE-15104.5.patch,
> HIVE-15104.5.patch, TPC-H 100G.xlsx
>
>
> the same sql, running on spark and mr engine, will generate different size
> of shuffle data.
> i think it is because of hive on mr just serialize part of HiveKey, but hive
> on spark which using kryo will serialize full of Hivekey object.
> what is your opionion?
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