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From Ryan King <>
Subject Re: need some help with counters
Date Thu, 09 Jun 2011 19:44:59 GMT
On Thu, Jun 9, 2011 at 12:41 PM, Ian Holsman <> wrote:
> Hi.
> I had a brief look at CASSANDRA-2103 (expiring counter columns), and I was wondering
if anyone can help me with my problem.
> I want to keep some page-view stats on a URL at different levels of granularity (page
views per hour, page views per day, page views per year etc etc).
> so my thinking was to create something a counter with a key based on Year-Month-Day-Hour,
and simply increment the counter as I go along.
> this work's well and I'm getting my metrics beautifully put into the right places.
> the only problem I have is that I only need the last 48-hours worth of metrics at the
hour level.
> how do I get rid of the old counters?
> do I need to write a archiver that will go through each url (could be millions) and just
delete them?
> I'm sure other people have encountered this, and was wondering how they approached it.

Here's how we are going to do it at twitter:


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