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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-829) no atomicity for a reader/writer for a job
Date Mon, 14 Sep 2009 19:04:57 GMT
no atomicity for a reader/writer for a job
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                 Key: HIVE-829
                 URL: https://issues.apache.org/jira/browse/HIVE-829
             Project: Hadoop Hive
          Issue Type: New Feature
          Components: Query Processor
            Reporter: Namit Jain


Hive currently does not provide any atomicity for a reader/writer.

So, if a reader/writer is running concurrently, the reader may randomly die or even see partial
results. 
Some kind of synchronization mechanisms (lease, lock in metastore/somewhere else) are needed
to manage the above.

This also applies to multiple writers (say multiple load into...)

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