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From Anty <anty....@gmail.com>
Subject Re: GC Storm
Date Sun, 13 Jun 2010 04:42:33 GMT
THX for your reply ,Jonathan.

On Sun, Jun 13, 2010 at 11:27 AM, Jonathan Ellis <jbellis@gmail.com> wrote:

> On Sat, Jun 12, 2010 at 7:46 PM, Anty <anty.rao@gmail.com> wrote:
> > Hi:ALL
> > I have 10 nodes cluster ,after inserting many records into the cluster, i
> > compact each node by nodetool compact.
>
> 5000 uncompacted sstables is unusual.  did you disable compaction
> during your inserts?  that is dangerous.
>

No, i do not disable compaction during my inserts. It is weird the minor
compaction is triggered less ofen.
I don't known why.Do you have any idea about this?


>
> > during the compaciton process ,something  wrong with one of the 10 nodes
> ,
> > when the size of the compacted temp file rech nearly 100GB( before
> > compaction ,the size is ~240G)
>
> sounds like it just didn't have enough memory to compact 5000 sstables
> at once.  not very surprising.
>
> a better approach: let it perform minor compactions normally, and when
> it is done with that (no compaction in progress and
> compactionmanager.pendingtasks == 0), then issue the major compaction
> if you still want to.
>
I will try it.

>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>



-- 
Best Regards
Anty Rao

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