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From Todd Burruss <bburr...@real.com>
Subject Re: GCGraceSeconds per ColumnFamily/Keyspace
Date Tue, 13 Jul 2010 16:05:09 GMT
Yes



-----Original Message-----
From: Jonathan Ellis [jbellis@gmail.com]
Received: 7/12/10 9:15 PM
To: user@cassandra.apache.org [user@cassandra.apache.org]
Subject: Re: GCGraceSeconds per ColumnFamily/Keyspace

Probably.  Can you open a ticket?

On Mon, Jul 12, 2010 at 10:41 PM, Todd Burruss <bburruss@real.com> wrote:
> Is it possible to get this feature in 0.7?
>
>
>
> -----Original Message-----
> From: Jonathan Ellis [jbellis@gmail.com]
> Received: 7/12/10 5:06 PM
> To: user@cassandra.apache.org [user@cassandra.apache.org]
> Subject: Re: GCGraceSeconds per ColumnFamily/Keyspace
>
> GCGS per CF sounds totally reasonable to me.
>
> On Mon, Jul 12, 2010 at 6:33 PM, Todd Burruss <bburruss@real.com> wrote:
>> I have two CFs in my keyspace.  one i care about allowing a good amount of
>> time for tombstones to propagate (GCGraceSeconds large) ... but the other i
>> couldn't care and in fact i want them gone ASAP so i don't iterate over
>> them.  has any thought been given to making this setting per Keyspace or per
>> ColumnFamily?
>>
>> my scenario is that i add columns to rows in one CF, UserData, with
>> logging data or activity, but we only want to keep, say 5000 columns per
>> user.  So i also store the user's ID in another CF, PruneCollection, and
>> periodically iterate over it using the IDs found in PruneCollection to
>> "prune" the columns in UserData - and then immediately delete the ID from
>> PruneCollection.  if the code is adding, say 50 IDs per second to
>> PruneCollection then the number of deleted keys starts to build up, forcing
>> my iterator to skip over large amounts of deleted keys.  With a small
>> GCGraceSeconds these keys are removed nicely, but i can't do that because it
>> affects the tombstones in UserData as well, which need to be propagated.
>>
>> thoughts?
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>



--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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