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From "B. Todd Burruss" <bburr...@real.com>
Subject Re: GCGraceSeconds per ColumnFamily/Keyspace
Date Tue, 13 Jul 2010 19:20:29 GMT
https://issues.apache.org/jira/browse/CASSANDRA-1276


On Tue, 2010-07-13 at 09:05 -0700, Todd Burruss wrote:
> 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? 


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