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From "Ahmet AKYOL (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3929) Support row size limits
Date Tue, 05 Mar 2013 15:41:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13593488#comment-13593488
] 

Ahmet AKYOL commented on CASSANDRA-3929:
----------------------------------------

I see [~slebresne]'s point and even without knowing C* internals, it really sounds like an
impossible task to do. The real problem here is, during compaction, nodes have to deal with
many rows; it's like a thread synchronization nightmare on node level(a.k.a. distributed systems:)
). So why not give responsibility to users and provide something like that :

{code}
delete from recentuseractivities where userid=1 AFTER COLUMN [50]; 
{code} 

users may add this statement after every insert in a batch or they can find a way to call
it less. It should skip tombstones and may not throw an exception for small sizes of course...

since it's row based, it seems doable to me.

or you may add this kind of feature to lists:

{code}
DELETE top_places [>50] FROM users WHERE user_id = 'frodo';
{code} 
something like [>N] could be added ...

just my two cents, no intention to interrupt your development process 
                
> Support row size limits
> -----------------------
>
>                 Key: CASSANDRA-3929
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3929
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Dave Brosius
>            Priority: Minor
>              Labels: ponies
>             Fix For: 2.0
>
>         Attachments: 3929_b.txt, 3929_c.txt, 3929_d.txt, 3929_e.txt, 3929_f.txt, 3929_g_tests.txt,
3929_g.txt, 3929.txt
>
>
> We currently support expiring columns by time-to-live; we've also had requests for keeping
the most recent N columns in a row.

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