[
https://issues.apache.org/jira/browse/HIVE-19329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jason Dere reassigned HIVE-19329:
---------------------------------
> Disallow some optimizations/behaviors for external tables
> ---------------------------------------------------------
>
> Key: HIVE-19329
> URL: https://issues.apache.org/jira/browse/HIVE-19329
> Project: Hive
> Issue Type: Bug
> Reporter: Jason Dere
> Assignee: Jason Dere
> Priority: Major
>
> External tables in Hive are often used in situations where the data is being
> created and managed by other applications outside of Hive. There are several
> issues that can occur when data being written to table directories by
> external apps:
> - If an application is writing files to a table/partition at the same time
> that Hive tries to merge files for the same table/partition (ALTER TABLE
> CONCATENATE, or hive.merge.tezfiles during insert) data can be lost.
> - When new data has been added to the table by external applications, the
> Hive table statistics are often way out of date with the current state of the
> data. This can result in wrong results in the case of answering queries using
> stats, or bad query plans being generated.
> Some of these operations should be blocked in Hive. It looks like some
> already have been (HIVE-17403).
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
