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