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Posted to commits@cassandra.apache.org by "Andres de la Peña (Jira)" <ji...@apache.org> on 2020/06/18 13:10:00 UTC
[jira] [Commented] (CASSANDRA-15500) Slow query logging emits
incomplete predicates
[ https://issues.apache.org/jira/browse/CASSANDRA-15500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17139407#comment-17139407 ]
Andres de la Peña commented on CASSANDRA-15500:
-----------------------------------------------
Closing since the fix for CASSANDRA-15503 includes a fix for this, and it's new tests cover the described case.
> Slow query logging emits incomplete predicates
> ----------------------------------------------
>
> Key: CASSANDRA-15500
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15500
> Project: Cassandra
> Issue Type: Bug
> Components: Observability/Logging
> Reporter: onmstester
> Priority: Normal
>
> Using Apache Cassandra 3.11.2, defined a table like this:
>
> _create table my_table(_
> __ _partition text,_
> __ _clustering1 int,_
> _clustering2 text,_
> _data set<text>,_
> ** _*primary key (partition, clustering1, clustering2))*_
>
> and configured slow queries threshold to 1ms in yaml to see how queries passed to cassandra. Query below:
>
> _select * from my_table where partition='a' and clustering1= 1 and clustering2='b'_
>
> would be like this in debug.log of cassandra:
>
> _select * from my_table where partition='a' LIMIT 100> (it means that the two cluster key restriction did not push down to storage engine and the whole partition been retrieved)_
>
> but this query:
>
> _select * from my_table where partition='a' and clustering1= 1_
>
> _would be_
>
> _select * from my_table where partition='a' and_ _clustering1= 1_ _LIMIT 100> (single cluster key been pushed down to storage engine)_
>
>
> _So it seems to me that, we could not restrict multiple clustering keys in select because it would retrieve the whole partition ?!_
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