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From Jonathan Ellis <>
Subject Re: Forcing Cassandra to free up some space
Date Thu, 26 May 2011 18:50:52 GMT
You'd have to call system.gc via JMX. is open to
address this, btw.

On Thu, May 26, 2011 at 1:09 PM, Konstantin  Naryshkin
<> wrote:
> I have a basic understanding of how Cassandra handles the file system
> (flushes in Memtables out to SSTables, SSTables get compacted) and I
> understand that old files are only deleted when a node is restarted, when
> Java does a GC, or when Cassandra feels like it is running out of space.
> My question is, is there some way for us to hurry the process along? We have
> a data that we do a lot of inserts into and then delete the data several
> hours later. We would like it if we could free up disk space (since our
> disks, though large, are shared with other applications). So far, the action
> sequence to accomplish this is:
> nodetoo flush -> nodetool repair -> nodetool compact -> ??
> Is there a way for me to make (or even gently suggest to) Cassandra that it
> may be a good time to free up some space?

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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