Question
How does FME Server Failover work under the covers?
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+22- Safer
If we log the messages sent from the failover system we see the following.
This set of messages is repeated 3 times.
fail_message arrived at 16:48:58
{ "msg": "FAILOVER Node: Heartbeat not detected on host AP-FAIL-CORE2 and port 7,073.", "ws_topic": "fail_message" }
fail_message arrived at 16:48:51
{ "msg": "FAILOVER Node: Heartbeat not detected on host AP-FAIL-CORE2 and port 7,075.", "ws_topic": "fail_message" }
fail_message arrived at 16:48:50
{ "msg": "FAILOVER Node: Heartbeat not detected on host AP-FAIL-CORE2 and port 7,071.", "ws_topic": "fail_message" }
fail_message arrived at 16:48:45
{ "msg": "FAILOVER Node: Heartbeat not detected on host AP-FAIL-CORE2 and port 7,072.", "ws_topic": "fail_message" }
Then we see this sent once:
fail_message arrived at 17:23:42
{ "msg": "ACTIVE Node: AP-FAIL-CORE1 has executed failover operation on host AP-FAIL-CORE2 and port 7,071.", "ws_topic": "fail_message" }
fail_message arrived at 17:23:41
{ "msg": "ACTIVE Node: AP-FAIL-CORE1 has executed failover operation on host AP-FAIL-CORE2 and port 7,073.", "ws_topic": "fail_message" }
fail_message arrived at 17:23:40
{ "msg": "ACTIVE Node: AP-FAIL-CORE1 has executed failover operation on host AP-FAIL-CORE2 and port 7,072.", "ws_topic": "fail_message" }
fail_message arrived at 17:23:37
{ "msg": "ACTIVE Node: AP-FAIL-CORE1 has executed failover operation on host AP-FAIL-CORE2 and port 7,075.", "ws_topic": "fail_message" }
There are 4 port numbers in these messages. They correspond to the following components:
7073 = scheduling
7075 = publishers
7071 = core
7072 = notification requests? core
+22- Safer
"AP-FAIL-CORE1 has executed failover operation on host AP-FAIL-CORE2”
^- this means: AP-FAIL-CORE2 is dead.
+22- Safer
fmeserver.log:
ACTIVE Node: Heartbeat not detected on host AP-FAIL-CORE1 and port 7,071 ACTIVE Node: Taking over jobs from host AP-FAIL-CORE1.+22- Safer
I don't know how these work:
# FAILOVER_SCHEDULER_OWNER - This is the scheduler owner name of the host to be monitored. By default the
# FAILOVER_MONITOR_HOST value is used which by default corresponds with the SCHEDULER_OWNER setitng
# of the monitored host.
#
# FAILOVER_TRANSFORMATION_OWNER - This is the transformation owner name of the host to be monitored. By default the
# FAILOVER_MONITOR_HOST value is used which by default corresponds with the TRANSFORMATION_OWNER setitng
# of the monitored host.