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Posted to issues-all@impala.apache.org by "ASF subversion and git services (Jira)" <ji...@apache.org> on 2022/10/17 21:53:00 UTC
[jira] [Commented] (IMPALA-11655) Impala should set merge-on-read by default
[ https://issues.apache.org/jira/browse/IMPALA-11655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17619120#comment-17619120 ]
ASF subversion and git services commented on IMPALA-11655:
----------------------------------------------------------
Commit dc912f016e4804331e5a9fe2960f8c89376195b3 in impala's branch refs/heads/master from Zoltan Borok-Nagy
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=dc912f016 ]
IMPALA-11655: Impala should set write mode "merge-on-read" by default
Similarly to HIVE-26596 Impala should set merge-on-read write mode
for V2 tables, unless otherwise specified:
* during table creation with 'format-version'='2'
* during alter table set tblproperties 'format-version'='2'
We do so because in the foreseeable future Impala will only support
merge-on-read (on the write-side, on the read side copy-on-write is
also supported). Also, currently Hive only supports merge-on-read.
Testing:
* e2e tests added
Change-Id: Icaa32472cde98e21fb23f5461175db1bf401db3d
Reviewed-on: http://gerrit.cloudera.org:8080/19138
Reviewed-by: Impala Public Jenkins <im...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>
> Impala should set merge-on-read by default
> ------------------------------------------
>
> Key: IMPALA-11655
> URL: https://issues.apache.org/jira/browse/IMPALA-11655
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Reporter: Zoltán Borók-Nagy
> Assignee: Zoltán Borók-Nagy
> Priority: Major
> Labels: impala-iceberg
>
> Similarly to HIVE-26596 Impala should set merge-on-read delete mode for V2 tables, unless otherwise specified:
> * during table creation with 'format-version'='2'
> * during alter table set tblproperties 'format-version'='2'
> We do so because in the foreseeable future Impala will only support merge-on-read (on the write-side, on the read side copy-on-write is also supported). Also, currently Hive only supports merge-on-read for DELETEs and UPDATEs.
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