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https://issues.apache.org/jira/browse/HIVE-3017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499300#comment-13499300
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Arup Malakar commented on HIVE-3017:
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I figured that hive-exec also contains all the classes from
hive-shims-0.10.0-SNAPSHOT.jar, hive-common-0.10.0-SNAPSHOT.jar etc.
I haven't checked what else it duplicates. Having the same class present in two
jars lead to confusion and is more error prone. In case we have both the jars
in classpath and they don't contain the same version of a class, wouldn't know
which class got used.
(Edited the title)
> hive-exec jar, contains classes from other modules(hive-serde, hive-shims,
> hive-common etc) duplicating those classes in two jars
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-3017
> URL: https://issues.apache.org/jira/browse/HIVE-3017
> Project: Hive
> Issue Type: Bug
> Reporter: Jakob Homan
>
> HIVE-2646 added the jars from hive-serde to the hive-exec class:
> {noformat}
> ...
> 0 Wed May 09 20:56:30 PDT 2012 org/apache/hadoop/hive/serde2/typeinfo/
> 1971 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/ListTypeInfo.class
> 2396 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/MapTypeInfo.class
> 2788 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/PrimitiveTypeInfo.class
> 4408 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/StructTypeInfo.class
> 900 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/TypeInfo.class
> 6576 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/TypeInfoFactory.class
> 1231 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/TypeInfoUtils$1.class
> 1239 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/TypeInfoUtils$TypeInfoParser$Token.class
> 7145 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/TypeInfoUtils$TypeInfoParser.class
> 14482 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/TypeInfoUtils.class
> 2594 Wed May 09 20:56:28 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/UnionTypeInfo.class
> 144 Wed May 09 20:56:30 PDT 2012
> org/apache/hadoop/hive/serde2/typeinfo/package-info.class
> ...{noformat}
> Was this intentional? If so, the serde jar should be deprecated. If not, the
> serde classes should be removed since this creates two sources of truth for
> them and can cause other problems (see HCATALOG-407).
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