Alexey Serbin has posted comments on this change. ( 
http://gerrit.cloudera.org:8080/17553 )

Change subject: IMPALA-10557: Support Kudu's multi-row transaction
......................................................................


Patch Set 8:

(3 comments)

http://gerrit.cloudera.org:8080/#/c/17553/8/be/src/exec/kudu-scan-node-base.h
File be/src/exec/kudu-scan-node-base.h:

http://gerrit.cloudera.org:8080/#/c/17553/8/be/src/exec/kudu-scan-node-base.h@102
PS8, Line 102: kudu::client::KuduClient* kudu_client() const
Well, now it's actually not const-correct [1].  I'd rather keep it non-const, 
but it's up to you.

If you want it to be const-correct, it should have the following signature:

  const kudu::client::KuduClient* kudu_client() const;

[1] 
https://chromium.googlesource.com/chromium/src/+/master/styleguide/c++/const.md


http://gerrit.cloudera.org:8080/#/c/17553/5/fe/src/main/java/org/apache/impala/service/Frontend.java
File fe/src/main/java/org/apache/impala/service/Frontend.java:

http://gerrit.cloudera.org:8080/#/c/17553/5/fe/src/main/java/org/apache/impala/service/Frontend.java@2237
PS5, Line 2237:  void
nit: I'm curious why this is logged with 'error' priority when similar log in 
commitKuduTransaction() is of 'info' priority? Is that because rolling back a 
transaction happens only due to an error, and it's not possible to initiate 
rolling back a transaction explicitly?


http://gerrit.cloudera.org:8080/#/c/17553/5/fe/src/main/java/org/apache/impala/service/Frontend.java@2239
PS5, Line 2239: Transaction
What if txn is null?  Can it happen only due to a programming error or it can 
happen in other cases?  If the former, does it make sense to add a 
precondition?  If the latter, does it deserve to be logged?



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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I876ada48991afdff5d61b5d6a0417571aba7cb34
Gerrit-Change-Number: 17553
Gerrit-PatchSet: 8
Gerrit-Owner: Wenzhe Zhou <wz...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <aser...@cloudera.com>
Gerrit-Reviewer: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: Bikramjeet Vig <bikramjeet....@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Qifan Chen <qc...@cloudera.com>
Gerrit-Reviewer: Wenzhe Zhou <wz...@cloudera.com>
Gerrit-Comment-Date: Thu, 10 Jun 2021 21:35:57 +0000
Gerrit-HasComments: Yes

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