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.

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