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https://issues.apache.org/jira/browse/IMPALA-8823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16906503#comment-16906503
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ASF subversion and git services commented on IMPALA-8823:
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Commit e1b93f27f3fb2a0f3d1c754f8e0e988bad838f11 in impala's branch
refs/heads/master from Gabor Kaszab
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=e1b93f2 ]
IMPALA-8823: DROP TABLE support for insert-only ACID tables
Enhances Impala to be able to drop insert-only transactional tables.
In order to do this Impala acquires an exclusive table lock in HMS
before performing the drop operation and releases the lock once
dropping the table finished.
INSERT statement does the locking and heartbeating on coordinator
side but for DROP TABLE all of these are done from Catalog side. This
means that alongside Impala coordinators now Catalog also does
heartbeating towards HMS.
Testing:
- E2E test: Dropped a table, re-created it and dropped again to
check if no locks remained in HMS.
- E2E test: After dropping a table from Impala checked if Hive also
sees it being dropped.
- Manual test: With a hacked Impala that runs a drop table long
enough I checked that there is a table lock entry in HMS during the
execution and disappears once the query finishes.
Change-Id: Ic41ca73268c4b75af5a08fe3dd1ada1df3f6fd34
Reviewed-on: http://gerrit.cloudera.org:8080/14038
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> Implement DROP TABLE for insert-only ACID tables
> ------------------------------------------------
>
> Key: IMPALA-8823
> URL: https://issues.apache.org/jira/browse/IMPALA-8823
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Zoltán Borók-Nagy
> Assignee: Gabor Kaszab
> Priority: Major
> Labels: impala-acid
>
> Impala currently cannot drop insert-only ACID tables.
> To implement DROP TABLE for insert-only tables at first we need to acquire an
> exclusive lock from HMS, then proceed with the usual DROP TABLE process.
> Heartbeating the lock might be also needed.
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