On 4/7/10 7:39 AM, Mark Jones wrote: > Also, if the data is pushed out to the other nodes before the bootstrapping, why has data been lost? Does this mean that decommissioning a node results in data loss? As I understand it, in the following scenario : 1) Node A has Keys 0-10. 2) Add Node B as a bootstrapping node, Node A is loadbalanced, sheds keys 5-10 to Node B. Keys 5-10 are not actually removed from the SSTables on Node A until a "cleanup compaction" is run. A "cleanup compaction" is a "major compaction" which also checks to see whether keys still "belong" on this host. I don't know whether you have actually experienced data loss, but based on the above, it should not be possible for you to have. =Rob