Does your issue look similar this one?
https://issues.apache.org/jira/browse/CASSANDRA-3532
It is also dealing with compactaion taking 10X longer in 1.0.X
On 12/13/2011 09:00 AM, Dan Hendry wrote:
I have been observing that major compaction can be incredibly slow in
Cassandra 1.0 and was curious the extent to which anybody else has
noticed similar behaviour. Essentially I believe the problem involves
the combination of wide rows and expiring columns.
Relevant details included in:
https://issues.apache.org/jira/browse/CASSANDRA-3592
Dan Hendry
(403) 660-2297