Hi all, Thanks you for your comments. I already read some papers about load balancing in P2P which some of them allow range query. During this time, I find another problem: "NEW KEYS"
Karger - Simple efficient load balancing algorithms for p2p systems. (support OPP) John Byers - Simple load balancing for distributed hash table. Third: Ananth Rao - Load balancing in structured P2P systems. I think the first paper is the best to get the background. Prefix Hash Tree: An Indexing Data Structure over Distributed Hash Tables and Range queries over DHTs These paper use PHT to allow range query. James Aspnes - Skip Graphs (most recent as I known) and Distributed Balanced Tables, Not making a hash of it All. All of these papers deal with load balancing and range query probs by creating schemes or strategies based on only "load - number of key on each nodes", not care about new keys and highly-accessed keys. HOWEVER, in fact, "the most recent keys are likely accessed more frequently". I suppose, we have 400.000 "NEW KEYS" in 2 recent days (are likely accessed more frequently). --> A scheme: these new keys are uniformly partitioned and divided into some successive nodes. For example, there are 10 node (N1...N10), keys in day 1 will be put into node_1_2, keys in day 2 will be put into node_3_4 and so on... But, the prob is that number of keys and nodes increase/decrease day by day (not fixed) --> the number of node used to store keys in each day may increase/decrease (1 or 3 node for example). Does any one have any ideas or know papers to deal with this prob (new keys and highly-accessed keys)? Thanks a lot.