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From "BELUGA BEHR (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (HIVE-21193) Support LZO Compression with CombineHiveInputFormat
Date Mon, 11 Feb 2019 19:35:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-21193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HIVE-21193 started by BELUGA BEHR.
------------------------------------------
> Support LZO Compression with CombineHiveInputFormat
> ---------------------------------------------------
>
>                 Key: HIVE-21193
>                 URL: https://issues.apache.org/jira/browse/HIVE-21193
>             Project: Hive
>          Issue Type: Improvement
>          Components: Compression
>    Affects Versions: 4.0.0, 3.2.0
>            Reporter: BELUGA BEHR
>            Assignee: BELUGA BEHR
>            Priority: Major
>         Attachments: HIVE-21193.1.patch
>
>
> In regards to LZO compression with Hive...
> https://cwiki.apache.org/confluence/display/Hive/LanguageManual+LZO
> It does not work out of the box if there are {{.lzo.index}} files present.  As I understand
it, this is because of the default Hive input format {{CombineHiveInputFormat}} does not handle
this correctly.  It does not like that there are a mix of data files and some index files,
it lumps them altogether when making the combined splits and Mappers fail when they try to
process the {{.lzo.index}} files as data.  When using the original {{HiveInputFormat}}, it
correctly identifies the {{.lzo.index}} files because it considers each file individually.
> Allow {{CombineHiveInputFormat}} to short-circuit LZO files and to not combine them.



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