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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ORC-255) Add support for reading ACID2 files to ORC
Date Mon, 16 Oct 2017 22:10:00 GMT
Alan Gates created ORC-255:
------------------------------

             Summary: Add support for reading ACID2 files to ORC
                 Key: ORC-255
                 URL: https://issues.apache.org/jira/browse/ORC-255
             Project: ORC
          Issue Type: New Feature
          Components: ACID
            Reporter: Alan Gates
            Assignee: Alan Gates


When ORC was split out of Hive the reading and writing of ACID files was left in Hive.  This
blocks non-Hive users from reading or writing ACID.  I propose to add support for ACID to
ORC.

At this point I only propose to add support for ACID 2 (that is, the version that will be
released in Hive 3, which simplifies the storage to have only inserts and deletes (updates
are an insert plus a delete)).

Also, note that to use this readers and writers would still have to interact with the Hive
metastore to get a list of valid transactions and acquire appropriate locks.



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