[jira] [Commented] (CASSANDRA-12060) Different failure format for failed LWT between 2.x and 3.x

["Sylvain Lebresne (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-12060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15407448#comment-15407448 ] 

Sylvain Lebresne commented on CASSANDRA-12060:
----------------------------------------------

bq. Sounds good.

I probably optimistically assumed that as you taking on yourself to make that change. So [~ifesdjeen], do you want to handle this, by which I mean getting 3.x to make a difference again between a "live" partition with no static content (but some other live rows), and a "dead" partition (with no live content at all), and this both the case of this ticket *and* the ones from CASSANDRA-9842. If so, I think we should do that asap as we have a bad behavior currently committed.

If you don't have time, I'll try to find someone else (or try to do it myself, but I'm off for 3 weeks very soon and I'd rather not wait until then if we can avoid it). 

> Different failure format for failed LWT between 2.x and 3.x
> -----------------------------------------------------------
>
>                 Key: CASSANDRA-12060
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12060
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Alex Petrov
>
> When executing following CQL commands: 
> {code}
> CREATE KEYSPACE test WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': '1' };
> USE test;
> CREATE TABLE testtable (a int, b int, s1 int static, s2 int static, v int, PRIMARY KEY (a, b));
> INSERT INTO testtable (a,b,s1,s2,v) VALUES (2,2,2,null,2);
> DELETE s1 FROM testtable WHERE a = 2 IF s2 IN (10,20,30);
> {code}
> The output is different between {{2.x}} and {{3.x}}:
> 2.x:
> {code}
> cqlsh:test> DELETE s1 FROM testtable WHERE a = 2 IF s2 = 5;
>  [applied] | s2
> -----------+------
>      False | null
> {code}
> 3.x:
> {code}
> cqlsh:test> DELETE s1 FROM testtable WHERE a = 2 IF s2 = 5;
>  [applied]
> -----------
>      False
> {code}
> {{2.x}} would although return same result if executed on a partition that does not exist at all:
> {code}
> cqlsh:test> DELETE s1 FROM testtable WHERE a = 5 IF s2 = 5;
>  [applied]
> -----------
>      False
> {code}
> It _might_ be related to static column LWTs, as I could not reproduce same behaviour with non-static column LWTs. The most recent change was [CASSANDRA-10532], which enabled LWT operations on static columns with partition keys only. -Another possible relation is [CASSANDRA-9842], which removed distinction between {{null}} column and non-existing row.- (striked through since same happens on pre-[CASSANDRA-9842] code.



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