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From Rahul Neelakantan <ra...@rahul.be>
Subject Re: disk space and tombstones
Date Mon, 18 Aug 2014 10:06:09 GMT
Is that GC_grace 300 days?

Rahul Neelakantan

> On Aug 18, 2014, at 5:51 AM, Dimetrio <dimetrio@flysoft.ru> wrote:
> 
> In our Twitter-like application users have their own timelines with news from
> subscriptions. To populate timelines we're using fanout on write. But we
> forced to trim it to keep free disk space under control.
> 
> We use wide rows pattern and trim them with "DELETE by primary key USING
> TIMESTAMP". But it seems our efforts have no effect and disk free space
> decreases rapidly, even after compaction.
> 
> It is clear for us that it's not the best use case for Cassandra, but maybe
> there is a way to decrease disk utilisation for this pattern?
> 
> Our cluster consists of 15 c3.4xlarge nodes with 300 GB storage. Timeline's
> files take up 170 GB on each node.
> gc_grace is 300,
> rf=3
> 
> 
> 
> --
> View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/disk-space-and-tombstones-tp7596356.html
> Sent from the cassandra-user@incubator.apache.org mailing list archive at Nabble.com.

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