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https://issues.apache.org/jira/browse/HIVE-4868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13764500#comment-13764500
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Yin Huai commented on HIVE-4868:
--------------------------------
HIVE-5102 will address this issue.
> When reading an ORC file by an MR job, some Mappers may not be able to
> process data in some cases
> -------------------------------------------------------------------------------------------------
>
> Key: HIVE-4868
> URL: https://issues.apache.org/jira/browse/HIVE-4868
> Project: Hive
> Issue Type: Improvement
> Reporter: Yin Huai
> Assignee: Yin Huai
>
> Let's say a stripe of an ORC file is 256 MB and we set the split size for an
> MR job to 64 MB. Right now, splits are created based on byte ranges.
> Here is an example:
> {code}
> |<-The start of a stripe |<-The end of a stripe
> v v
> |---------------------------------------|
> ^ ^
> |<- The start of a split |<- The end of a split
> {\code}
> So, for some Mappers, it is possible that there is no start of a stripe
> within the byte range of a split. Those Mappers will process 0 record. We can
> improve how splits are created for ORC.
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