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https://issues.apache.org/jira/browse/HIVE-7250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14034991#comment-14034991
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Prasanth J commented on HIVE-7250:
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Was able to load 15K columns of the test dataset similar to the qtest dataset
in patch with default 1GB heap. 20K columns causes OOM.
> Adaptive compression buffer size for wide tables in ORC
> -------------------------------------------------------
>
> Key: HIVE-7250
> URL: https://issues.apache.org/jira/browse/HIVE-7250
> Project: Hive
> Issue Type: Improvement
> Components: File Formats
> Affects Versions: 0.14.0
> Reporter: Prasanth J
> Assignee: Prasanth J
> Labels: orcfile
> Attachments: HIVE-7250.1.patch, HIVE-7250.2.patch
>
>
> If the input table is wide (in the order of 1000s), ORC compression buffer
> size overhead becomes significant causing OOM issues. To overcome this issue,
> buffer size should be adaptively chosen based on the available memory and the
> number of columns.
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