2011/2/3 Oleg Proudnikov > ruslan usifov gmail.com> writes: > > > > > > > 2011/2/3 Oleg Proudnikov cloudorange.com> > > Is it possible that the key "1212" maps to the first node? I am assuming > RF=1. > > You could try random keys to test this theory... > > > > > > Yes you right "1212" goes to first node. I distribute tokens like > described in > "Operations": > > http://wiki.apache.org/cassandra/Operations:085070591730234615865843651857942052864So > delay in my second experiment(where i got big delay in insert), appear as > result > of delay communications between nodes? > > > > That was the theory, assuming you are using replication factor of 1. > > It is difficult to say where the key falls just by looking at the ring - > random > partitioner could through this key on either node. After writing 1 million > rows > Hm this is very simple to calculate for random, partitioner, this script on python do that: from hashlib import md5; def tokens(nodes): l_retval = []; for x in xrange(nodes): l_retval.append(2 ** 127 / nodes * x); return l_retval; def wherekey(key, orderednodetokens): l_m = md5(); l_m.update(key); l_keytoken = long(l_m.hexdigest(), 16); l_found = False; l_i = 0; for l_nodetoken in orderednodetokens: if l_keytoken <= l_nodetoken: l_found = True; break; l_i += 1; if l_found: return l_i; return 0; ring = tokens(2); print wherekey("1212", ring); So for key "1212" will by chosen 0 node. 10.24.84.4 in my case