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2.12 How RTR Selects Processing-states (Roles) for Nodes
The SHOW PARTITION command on each backend node is as follows:
Backend partitions on node BRONZE in group "test" at Mon Mar 22 14:52:32 1999
Partition name:
Facility:
RTR$DEFAULT_FACILITY
Low bound:
Active servers:
Transaction presentation:
Active transaction count:
Failover policy:
fail_to_standby
Master router:
Features:
Backend partitions on node GOLD in group "test" at Mon Mar 22 14:54:12 1999
Partition name:
Facility:
RTR$DEFAULT_FACILITY
Low bound:
Active servers:
Transaction presentation:
Active transaction count:
Failover policy:
fail_to_standby
Master router:
Features:
The following description shows how sequence numbers are initially assigned in a
simple partition with two backends named Bronze and Gold, and a router named
Silver.
Router
2
6
4
1. A partition (with shadowing enabled) is started on node Bronze.
2. The partition on Bronze obtains sequence number 1 from the router and
becomes the primary.
3. Another server on the same partition (with the same attributes) is started on
Gold.
4. The partition on Gold obtains sequence number 2 from the router and
becomes the secondary.
5. Node Bronze crashes and reboots (the partition sequence number on Bronze
is reset to 0). The partition on Gold goes into Remember.
6. When the server starts, The partition on Bronze obtains sequence number 3
from the router and becomes the secondary, Gold now becomes the primary.
7. The network connection from node Silver to node Gold fails. The partition on
Bronze becomes the primary. The partition on node Gold loses quorum and is
in a wait-for-quorum state.
Starting and Setting Up RTR
State:
0
High bound:
0
Free servers:
active
Last Rcvy BE:
0
Transactions recovered:
Key range ID:
silver
Relative priority:
State:
0
High bound:
0
Free servers:
active
Last Rcvy BE:
0
Transactions recovered:
Key range ID:
silver
Relative priority:
1
Backend A
5
3
Backend B
7
8
pri_act
4294967295
16777217
Shadow,NoStandby,Concurrent
sec_act
4294967295
bronze
16777216
Shadow,NoStandby,Concurrent
Starting and Setting Up RTR 2–19
p1
1
gold
0
1
p1
1
0
2
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