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https://issues.apache.org/jira/browse/HIVE-12594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15796010#comment-15796010
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Eugene Koifman commented on HIVE-12594:
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another example is "show tables" which takes an S lock on DB for the same reason
it should not conflict with X lock when doing "insert overwrite
table/partition" on acid table or "insert into table/partition" of non-acid
table.
> X lock on partition should not conflict with S lock on DB
> ---------------------------------------------------------
>
> Key: HIVE-12594
> URL: https://issues.apache.org/jira/browse/HIVE-12594
> Project: Hive
> Issue Type: Improvement
> Components: Transactions
> Affects Versions: 1.0.0
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
>
> S lock on DB is acquired when creating a new table in that DB to make sure
> the DB is not dropped at the same time
> This should not conflict with operations such as rebuild index which takes an
> Exclusive lock on a partition. See also HIVE-10242
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