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https://issues.apache.org/jira/browse/HIVE-4475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657663#comment-13657663
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Owen O'Malley commented on HIVE-4475:
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I'm concerned about changing the default behavior, especially without a
mechanism to get the old behavior. There are some advantages to the current
serde, such as being able to read the rcfile with a different schema, although
you are right that the binary is better choice in general.
Maybe the right answer is to make a config knob that sets the default rcfile
serde. Thoughts?
> Switch RCFile default to LazyBinaryColumnarSerDe
> ------------------------------------------------
>
> Key: HIVE-4475
> URL: https://issues.apache.org/jira/browse/HIVE-4475
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Gunther Hagleitner
> Attachments: HIVE-4475.1.patch
>
>
> For most workloads it seems LazyBinaryColumnarSerDe (binary) will perform
> better than ColumnarSerDe (text). Not sure why ColumnarSerDe is the default,
> but my guess is, that's for historical reasons. I suggest switching the
> default.
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