[jira] Updated: (HIVE-789) Add get_unique_id() call to metastore

["Todd Lipcon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated HIVE-789:
-----------------------------

    Attachment: hive-789.patch

This patch implements get_unique_id.

One concern: do I need to do any kind of migration script for metastore databases? I don't know how metastore schema migrations are done from release to release.

> Add get_unique_id() call to metastore
> -------------------------------------
>
>                 Key: HIVE-789
>                 URL: https://issues.apache.org/jira/browse/HIVE-789
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Metastore
>            Reporter: Todd Lipcon
>             Fix For: 0.4.0
>
>         Attachments: hive-789.patch
>
>
> As noted in HIVE-718, it can be tough to avoid race conditions when multiple clients are trying to move files into the same directory. This patch adds a get_unique_id() call to the metastore that returns the current value from an incrementing JDO Sequence so that clients can avoid some races without locks.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.