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From Jeffrey Wang <>
Subject RE: rolling window of data
Date Thu, 03 Feb 2011 05:46:16 GMT
Thanks for the link, but unfortunately it doesn't look like it uses a rolling window. As far
as I can tell, log entries just keep getting inserted into Cassandra.


From: Aaron Morton []
Sent: Wednesday, February 02, 2011 9:21 PM
Subject: Re: rolling window of data

This project may provide some inspiration for you

Not sure if it has a rolling window, if you find out let me know :)


On 03 Feb, 2011,at 06:08 PM, Jeffrey Wang <> wrote:

We're trying to use Cassandra 0.7 to store a rolling window of log data (e.g. last 90 days).
We use the timestamp of the log entries as the column names so we can do time range queries.
Everything seems to be working fine, but it's not clear if there is an efficient way to delete
data that is more than 90 days old.

Originally I thought that using a slice range on a deletion would do the trick, but that apparently
is not supported yet. Another idea I had was to store the timestamp of the log entry as Cassandra's
timestamp and pass in artificial timestamps to remove (thrift API), but that seems hacky.
Does anyone know if there is a good way to support this kind of rolling window of data efficiently?


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