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https://issues.apache.org/jira/browse/HIVE-17650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16191780#comment-16191780
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Eugene Koifman commented on HIVE-17650:
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perhaps this handled by DDLSemanctiAnalyzer.addInputsOutputsAlterTable(boolean
doForceExclusive)
> DDLTask.handleRemoveMm() assumes locks not present
> --------------------------------------------------
>
> Key: HIVE-17650
> URL: https://issues.apache.org/jira/browse/HIVE-17650
> Project: Hive
> Issue Type: Sub-task
> Components: Transactions
> Reporter: Eugene Koifman
>
> This moves every file in the table from under delta_x_x/ to root of the
> table/partition
> How would this work for bucketed tables? Will it create bucket_x_copy_N
> files?
> This could create 1000s of copy_N files - this will likely break something
> The comments in the method assume locks are present - this would imply that
> there are appropriate Read/WriteEntity objects already created - I doubt this
> is the case for a table property change.
> It seems like this kind of op should require an Exclusive lock at table level
> to prevent concurrent inserts (into new delta_x_x/)
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