[jira] [Commented] (CASSANDRA-3383) Make Row cache reject wide rows which are more than x columns

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

    [ https://issues.apache.org/jira/browse/CASSANDRA-3383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13130768#comment-13130768 ] 

Jonathan Ellis commented on CASSANDRA-3383:
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My reaction would be that 

1) if you really have different data sets involved, the "right" solution would be to split those into different CFs

2) but if you have the same data set where some outlier rows are much larger than others then a "query cache" like CASSANDRA-1956 might be a good general purpose solution


                
> Make Row cache reject wide rows which are more than x columns
> -------------------------------------------------------------
>
>                 Key: CASSANDRA-3383
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3383
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.1
>         Environment: Linux with Sun JDK
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>
> The problem with the row cache is it has to cache the whole row into the memory, this works great for small rows but not for the wide rows. Even off-heap cache has to read everything into the heap eventually causing GC overhead (If your query is to get few columns).
> It will be nice to reject the rows which are bigger than x columns (This can be a KS setting).... this will help cases where we have mixed load of small and wide column datasets in the same cf.

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