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From "Namit Jain (JIRA)" <>
Subject [jira] Commented: (HIVE-1918) Add export/import facilities to the hive system
Date Wed, 09 Feb 2011 06:41:00 GMT


Namit Jain commented on HIVE-1918:

1. Just moving the serialization/deserialization methods
3. inputs and outputs are present in SemanticAnalyzer - 

Look at ReadEntity/WriteEntity - they are populated by the appropriate semantic analyzer and
then used later by:

a. concurrency : uses inputs/outputs to lock those objects
b. authorization: uses inputs/outputs for permission checking
c. execution hooks: they can be used for a variety of things: in facebook, we use them for

> Add export/import facilities to the hive system
> -----------------------------------------------
>                 Key: HIVE-1918
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Krishna Kumar
>            Assignee: Krishna Kumar
>         Attachments: HIVE-1918.patch.1.txt, HIVE-1918.patch.2.txt, HIVE-1918.patch.3.txt,
HIVE-1918.patch.txt, hive-metastore-er.pdf
> This is an enhancement request to add export/import features to hive.
> With this language extension, the user can export the data of the table - which may be
located in different hdfs locations in case of a partitioned table - as well as the metadata
of the table into a specified output location. This output location can then be moved over
to another different hadoop/hive instance and imported there.  
> This should work independent of the source and target metastore dbms used; for instance,
between derby and mysql.
> For partitioned tables, the ability to export/import a subset of the partition must be
> Howl will add more features on top of this: The ability to create/use the exported data
even in the absence of hive, using MR or Pig. Please see
for these details.

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