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