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From "Bennie Schut (JIRA)" <>
Subject [jira] [Created] (HIVE-3308) Mixing avro and snappy gives null values
Date Fri, 27 Jul 2012 13:53:33 GMT
Bennie Schut created HIVE-3308:

             Summary: Mixing avro and snappy gives null values
                 Key: HIVE-3308
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
    Affects Versions: 0.10.0
            Reporter: Bennie Schut

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
This causes any job (exception select * from avrotable is that not truly a job) to show null
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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