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https://issues.apache.org/jira/browse/HIVE-3106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin Wilfong updated HIVE-3106:
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Attachment: HIVE-3106.2.patch.txt
> Add option to make multi inserts more atomic
> --------------------------------------------
>
> Key: HIVE-3106
> URL: https://issues.apache.org/jira/browse/HIVE-3106
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Kevin Wilfong
> Assignee: Kevin Wilfong
> Attachments: HIVE-3106.1.patch.txt, HIVE-3106.2.patch.txt
>
>
> Currently, with multi-insert queries as soon the output of one of the inserts
> is ready the move task associated with that insert is run, creating the
> table/partition. However, if concurrency is enabled the lock on this
> table/partition is not released until the entire query finishes, which can be
> much later.
> This causes issues if, for example, a user is waiting for an output of the
> multi-insert query which is created long before the other outputs, and
> checking for it's existence using the metastore's Thrift methods
> (get_table/get_partition). In which case, the user will run their query
> which uses the output, and it will experience a timeout trying to acquire the
> lock on the table/partition.
> If all the move tasks depend on the parent's of all other move tasks, the
> output creation will be much closer to atomic relieving this problem.
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