Hi, Sage and all Cepher
I am reading Ceph's implementation of paxos and have a question about it.
The question is given by an example below:
Assume there are 5 monitor nodes: n1, n2, n3, n4, n5.
1) Node n1 is the leader, all nodes are synchroined with
Last_committed=100, and there is no pending operation;
2) A client, say c1, sends a request R1 to n1;
3) Node n1 proposes a value v(for R1) with log version 101, stores
version 101 and pending_v =101 in its db. But it goes down before
sending anything to other nodes;
Note: only n1 has pending_v == 101.
4) Node n2 becomes the leader(without n1) and the cluster become
active. Client c1 querys n2 for status, and the result shows R1 is
lost;
5) Node n1 recovers and becomes leader again;
6) Node n1 finds pending_v == 101 and log version 101, so R1 get
replicated and applied;
7) Client C1 queries again, and finds R1 has been applied.
==>inconsitent with the result of 4)
Am I right on this point?
Thanks
Fisher
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