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From Benjamin Black...@b3k.us>
Subject Re: GC Storm
Date Sun, 13 Jun 2010 18:03:57 GMT
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.
> 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)

Compaction is not compression, it is merging of SSTables and tombstone
elimination.  If you are not doing many deletes or overwrites of
existing data, the compacted SSTable will be about the same size as
the total size of all the smaller SSTables that went into it.  It is
not clear to me how you ended up with 5000 SSTables (the *-data.db
files) of such small size if you have not disabled minor compactions.

Can you post your storage-conf.xml someplace (pastie or
gist.github.com, for example)?


b

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