There is two nodes: A, B. They are in one group, then we cut off the network
cable of A then we notice from the log that two of them are in a single group.
After plug in back the network cable into the A then they merged together but
none of them get the actual state of the other.
Our configuration:
<UDP send_on_all_interfaces="true" receive_on_all_interfaces="true"
mcast_addr="228.1.2.3" mcast_port="48866"
ip_ttl="64" ip_mcast="true"
mcast_send_buf_size="150000" mcast_recv_buf_size="80000"
ucast_send_buf_size="150000" ucast_recv_buf_size="80000"
use_incoming_packet_handler="false"
use_outgoing_packet_handler="false"
loopback="false"/>
<PING timeout="2000" num_initial_members="3"
up_thread="true" down_thread="true"/>
<MERGE2 min_interval="10000" max_interval="20000"/>
<FD shun="true" up_thread="true" down_thread="true"
timeout="2500" max_tries="5"/>
<VERIFY_SUSPECT timeout="1500"
up_thread="false" down_thread="false"/>
<pbcast.NAKACK gc_lag="50"
retransmit_timeout="600,1200,2400,4800"
max_xmit_size="8192" up_thread="false" down_thread="false"/>
<UNICAST timeout="600,1200,2400" window_size="100"
min_threshold="10"
down_thread="false"/>
<pbcast.STABLE desired_avg_gossip="20000"
up_thread="false" down_thread="false"/>
<FRAG frag_size="8192"
down_thread="false" up_thread="false"/>
<pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
shun="true" print_local_addr="true"/>
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