How to force GC in Cassandra?

[Weijun Li <we...@gmail.com>]

Suppose I insert a lot of new items but also delete a lot of new items
daily, it will be ideal if I can force GC to happen during mid night (when
traffic is low). Is there any way to manually force GC to be executed? In
this way I can add a cronjob to trigger gc in mid night. I tried nodetool
and the JMX interface but they don't seem to have that.

-Weijun

Re: How to force GC in Cassandra?

[Weijun Li <we...@gmail.com>]

Thanks Jonathan! I looked into your code and guessed that compaction is the
one that cleans all deleted columns from sstable.

-Weijun

On Fri, Mar 12, 2010 at 12:05 PM, Jonathan Ellis <jb...@gmail.com> wrote:

> I think you mean compaction?
>
> You can use nodeprobe / nodetool for that.
>
> http://wiki.apache.org/cassandra/NodeProbe
>
> On Fri, Mar 12, 2010 at 12:40 PM, Weijun Li <we...@gmail.com> wrote:
> > Suppose I insert a lot of new items but also delete a lot of new items
> > daily, it will be ideal if I can force GC to happen during mid night
> (when
> > traffic is low). Is there any way to manually force GC to be executed? In
> > this way I can add a cronjob to trigger gc in mid night. I tried nodetool
> > and the JMX interface but they don't seem to have that.
> >
> > -Weijun
> >
>

Re: How to force GC in Cassandra?

[Jonathan Ellis <jb...@gmail.com>]

I think you mean compaction?

You can use nodeprobe / nodetool for that.

http://wiki.apache.org/cassandra/NodeProbe

On Fri, Mar 12, 2010 at 12:40 PM, Weijun Li <we...@gmail.com> wrote:
> Suppose I insert a lot of new items but also delete a lot of new items
> daily, it will be ideal if I can force GC to happen during mid night (when
> traffic is low). Is there any way to manually force GC to be executed? In
> this way I can add a cronjob to trigger gc in mid night. I tried nodetool
> and the JMX interface but they don't seem to have that.
>
> -Weijun
>