[jira] [Commented] (CASSANDRA-8048) Add WARN for large resultsets

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-8048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14598813#comment-14598813 ] 

Jonathan Ellis commented on CASSANDRA-8048:
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Created CASSANDRA-9643 to warn for large partitions and edited this title to make clear the distinction.

NB: Let's get our terminology consistent.  You're worried about partitions, not rows.

> Add WARN for large resultsets
> -----------------------------
>
>                 Key: CASSANDRA-8048
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8048
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Adam Hattrell
>
> Similarly to how we warn on excessive tombstones or large batches - it would be useful to warn if we come across a large row over a specific threshold.
> If not too intrusive it could provide us with a smoking gun for gc thrashing type issues.
> To put some meat on the bones - I've recently seen someone store a 1Gb blob and then try to work round it by splitting it into 3 columns of 330 Mb each.  Neither gave particularly good performance.
> On the opposite side of the coin - a large number of columns grabbed at once can also lead to problems.



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