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Posted to dev@hive.apache.org by "Jeff Hammerbacher (JIRA)" <ji...@apache.org> on 2009/10/21 08:19:59 UTC
[jira] Created: (HIVE-895) Add SerDe for Avro serialized data
Add SerDe for Avro serialized data
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Key: HIVE-895
URL: https://issues.apache.org/jira/browse/HIVE-895
Project: Hadoop Hive
Issue Type: New Feature
Components: Serializers/Deserializers
Reporter: Jeff Hammerbacher
As Avro continues to mature, having a SerDe to allow HiveQL queries over Avro data seems like a solid win.
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[jira] Commented: (HIVE-895) Add SerDe for Avro serialized data
Posted by "Alex Rovner (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889558#action_12889558 ]
Alex Rovner commented on HIVE-895:
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Can some one please explain to me how would this serde work?
Specifically how would it deserialize the data?
>From what I understand Avro file has a header that defines the data that is stored in the file. In order to deserialize the data you need to read the header which is a challenge in Hive's Deserialize interface because the initialize() method does not know anything about the input file. (Note: there is a hack that can get you the file by getting the map.input hadoop property.... this hack however is not good enough in hive because some one might be using the CLI to query which will not trigger a map reduce job.
Does anyone know a good solution to this issue?
I am actually trying to implements a different file format but the idea of our format is similar to Avro: Each file has a header in which it contains a "schema"
Thanks
> Add SerDe for Avro serialized data
> ----------------------------------
>
> Key: HIVE-895
> URL: https://issues.apache.org/jira/browse/HIVE-895
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Serializers/Deserializers
> Reporter: Jeff Hammerbacher
>
> As Avro continues to mature, having a SerDe to allow HiveQL queries over Avro data seems like a solid win.
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[jira] Updated: (HIVE-895) Add SerDe for Avro serialized data
Posted by "Carl Steinbach (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-895?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Carl Steinbach updated HIVE-895:
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Assignee: (was: Carl Steinbach)
> Add SerDe for Avro serialized data
> ----------------------------------
>
> Key: HIVE-895
> URL: https://issues.apache.org/jira/browse/HIVE-895
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Serializers/Deserializers
> Reporter: Jeff Hammerbacher
>
> As Avro continues to mature, having a SerDe to allow HiveQL queries over Avro data seems like a solid win.
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[jira] Assigned: (HIVE-895) Add SerDe for Avro serialized data
Posted by "Carl Steinbach (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-895?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Carl Steinbach reassigned HIVE-895:
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Assignee: Carl Steinbach
> Add SerDe for Avro serialized data
> ----------------------------------
>
> Key: HIVE-895
> URL: https://issues.apache.org/jira/browse/HIVE-895
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Serializers/Deserializers
> Reporter: Jeff Hammerbacher
> Assignee: Carl Steinbach
>
> As Avro continues to mature, having a SerDe to allow HiveQL queries over Avro data seems like a solid win.
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[jira] Commented: (HIVE-895) Add SerDe for Avro serialized data
Posted by "Zheng Shao (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889772#action_12889772 ]
Zheng Shao commented on HIVE-895:
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We should just copy \the schema information from the file header to the hive metastore.
> Add SerDe for Avro serialized data
> ----------------------------------
>
> Key: HIVE-895
> URL: https://issues.apache.org/jira/browse/HIVE-895
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Serializers/Deserializers
> Reporter: Jeff Hammerbacher
>
> As Avro continues to mature, having a SerDe to allow HiveQL queries over Avro data seems like a solid win.
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