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https://issues.apache.org/jira/browse/HIVE-12450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Prasanth Jayachandran updated HIVE-12450:
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Attachment: HIVE-12450.2.patch
Minor change. The compression buffer size should only be set when compression
is not NONE to avoid the bug in HIVE-12452
> OrcFileMergeOperator does not use correct compression buffer size
> -----------------------------------------------------------------
>
> Key: HIVE-12450
> URL: https://issues.apache.org/jira/browse/HIVE-12450
> Project: Hive
> Issue Type: Bug
> Components: ORC
> Affects Versions: 1.2.0, 1.3.0, 1.2.1, 2.0.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Priority: Critical
> Attachments: HIVE-12450.1.patch, HIVE-12450.2.patch
>
>
> OrcFileMergeOperator checks for compatibility before merging orc files. This
> compatibility check include checking compression buffer size. But the output
> file that is created does not honor the compression buffer size and always
> defaults to 256KB. This will not be a problem when reading the orc file but
> can create unwanted memory pressure because of wasted space within
> compression buffer.
> This issue also can make the merged file unreadable under certain cases. For
> example, if the original compression buffer size is 8KB and if
> hive.exec.orc.default.buffer.size is set to 4KB. The merge file operator will
> use 4KB instead of actual 8KB which can result in hanging of ORC reader (more
> specifically ZlibCodec will wait for more compression buffers).
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