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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3308) Mixing avro and snappy gives null values
Date Tue, 09 Apr 2013 00:46:17 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13626035#comment-13626035
] 

Navis commented on HIVE-3308:
-----------------------------

Committed to trunk. Thanks, Bennie.
                
> Mixing avro and snappy gives null values
> ----------------------------------------
>
>                 Key: HIVE-3308
>                 URL: https://issues.apache.org/jira/browse/HIVE-3308
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.10.0
>            Reporter: Bennie Schut
>            Assignee: Bennie Schut
>         Attachments: HIVE-3308.patch1.txt, HIVE-3308.patch2.txt
>
>
> On default hive uses LazySimpleSerDe for output.
> When I now enable compression and "select count(*) from avrotable" the output is a file
with the .avro extension but this then will display null values since the file is in reality
not an avro file but a file created by LazySimpleSerDe using compression so should be a .snappy
file.
> This causes any job (exception select * from avrotable is that not truly a job) to show
null values.
> If you use any serde other then avro you can temporarily fix this by setting "set hive.output.file.extension=.snappy"
and it will correctly work again but this won't work on avro since it overwrites the hive.output.file.extension
during initializing.
> When you dump the query result into a table with "create table bla as" you can rename
the .avro file into .snappy and the "select from bla" will also magiacally work again.
> Input and Ouput serdes don't always match so when I use avro as an input format it should
not set the hive.output.file.extension.
> Onces it's set all queries will use it and fail making the connection useless to reuse.

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