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From "Jon Hermes (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (CASSANDRA-1276) GCGraceSeconds per ColumnFamily
Date Wed, 21 Jul 2010 18:55:52 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890819#action_12890819
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Jon Hermes edited comment on CASSANDRA-1276 at 7/21/10 2:54 PM:
----------------------------------------------------------------

Fixed conflicts from some other commit.
Not seeing any consistent test failures (and the inconsistent tests are not the two named
above (and they're not related as I'm seeing them be inconsistent on a clean checkout)).

      was (Author: jhermes):
    Fixed conflicts from some other commit.
Not seeing any consistent test failures (and the inconsistent tests are not the two named
above).
  
> GCGraceSeconds per ColumnFamily
> -------------------------------
>
>                 Key: CASSANDRA-1276
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1276
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.7
>            Reporter: B. Todd Burruss
>            Assignee: Jon Hermes
>            Priority: Minor
>             Fix For: 0.7
>
>         Attachments: 1276-v4.txt, 1276-v5.txt
>
>
> 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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