Z, You are forcing a byzantine failure, the paxos implemented to form the consensus ring of the mon daemons does not support this kind of failures, that is why you get and erratic behaviour, I believe is the common paxos algorithm implemented in mon daemon code.
If you just gracefully shutdown a mon daemon everything will work fine, but with this you can not prove a split brain situation, because you will force the election of the leader by quorum. Maybe with 2 mon daemons and closing the communication between each of them every mon daemon will believe that can be a leader because every daemon will have the que quorum of 1 with no other vote. Just saying :) On Jul 4, 2017 12:57 AM, "Z Will" <zhao6...@gmail.com> wrote: > Hi: > I am testing ceph-mon brain split . I have read the code . If I > understand it right , I know it won't be brain split. But I think > there is still another problem. My ceph version is 0.94.10. And here > is my test detail : > > 3 ceph-mons , there ranks are 0, 1, 2 respectively.I stop the rank 1 > mon , and use iptables to block the communication between mon 0 and > mon 1. When the cluster is stable, start mon.1 . I found the 3 > monitors will all can not work well. They are all trying to call new > leader election . This means the cluster can't work anymore. > > Here is my analysis. Because mon will always respond to leader > election message, so , in my test, communication between mon.0 and > mon.1 is blocked , so mon.1 will always try to be leader, because it > will always see mon.2, and it should win over mon.2. Mon.0 should > always win over mon.2. But mon.2 will always responsd to the election > message issued by mon.1, so this loop will never end. Am I right ? > > This should be a problem? Or is it was just designed like this , and > should be handled by human ? > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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