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https://issues.apache.org/jira/browse/HIVE-7231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14053398#comment-14053398
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Lefty Leverenz commented on HIVE-7231:
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Facepalm! Now that the patch is committed I've finally noticed that
hive.exec.orc.block.padding.tolerance is not a percentage but a decimal
fraction. For example, with a 64 MB stripe size the default 0.05 gives 3.2 MB
tolerance (0.05 * 64, not 0.05% of 64).
This is only a tech-writer's quibble which isn't likely to confuse anyone.
I'll explain it in the wiki and put a request in HIVE-6586 to fix it with
HIVE-6037.
> Improve ORC padding
> -------------------
>
> Key: HIVE-7231
> URL: https://issues.apache.org/jira/browse/HIVE-7231
> Project: Hive
> Issue Type: Improvement
> Components: File Formats
> Affects Versions: 0.14.0
> Reporter: Prasanth J
> Assignee: Prasanth J
> Labels: TODOC14, orcfile
> Fix For: 0.14.0
>
> Attachments: HIVE-7231.1.patch, HIVE-7231.2.patch, HIVE-7231.3.patch,
> HIVE-7231.4.patch, HIVE-7231.5.patch, HIVE-7231.6.patch, HIVE-7231.7.patch,
> HIVE-7231.8.patch
>
>
> Current ORC padding is not optimal because of fixed stripe sizes within
> block. The padding overhead will be significant in some cases. Also padding
> percentage relative to stripe size is not configurable.
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