[jira] [Resolved] (CASSANDRA-8825) Mutation size warnings (batch, insert/update)

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

     [ https://issues.apache.org/jira/browse/CASSANDRA-8825?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sylvain Lebresne resolved CASSANDRA-8825.
-----------------------------------------
    Resolution: Duplicate

I don't think warning when the batch is on a single partition was ever intended so let's just fix that. Hence marking as duplicate of CASSANDRA-10876.

> Mutation size warnings (batch, insert/update)
> ---------------------------------------------
>
>                 Key: CASSANDRA-8825
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8825
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Marcus Olsson
>            Priority: Trivial
>
> Just to clarify, this isn't a request to increase the default warn threshold for batch sizes, but rather a general discussion around it to get clarification of batches and perhaps change the current behaviour of size warnings.
> When using large batches you get a warning if the batch size exceeds the batch_size_warn_threshold_in_kb, but is this always necessary?
> I know that using batches for performance usually isn't recommended, but in my understanding this is if the batch contains multiple partitions. Does this apply for single partitions as well?
> If there isn't a problem with large batches on a single partition then maybe the size warning shouldn't be there(or be of a separate size for single partitions?). If there is then maybe a warning should be added for insert/update as well? I realise that getting to that size for a single insert is harder, but it's still possible(e.g. storing a file in a blob, which I guess is discouraged so a warning might be good?).
> So I guess that depending on what the problem is there are three courses of action:
> If the size of a single partition isn't a problem
>  - Check if the batch involves multiple partitions before warning.
> If the size of a single partitions isn't as much of a problem as multiple partitions
>  - Create a separate warn threshold for single partitions.
>  - Maybe add the same warning for insert/update.
> If the size is always a problem
>  - Add the same warning for insert/update.



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