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Problems using GTID replication a -> b(more info) -> c
Posted by: Truls Bergskaug
Date: October 08, 2015 08:04AM

I have an issue in a replication setup which from time-to-time stops
working. The customer is using GTID.

server-a is master
server-b replicates from server-a and adds its own data
server-c replicates from server-b and should have role as backup/standby

Sometimes it seems that server-c tries to connect to server-a, and not
to server-b as it should.

It might be related to some confusion about the received GTID

From server-c: SHOW SLAVE STATUS\G
...
Retrieved_Gtid_Set:
7213a549-c19d-11e4-b6b8-00505697a71e:205335827-1013317200,
cf7877d6-c19d-11e4-b6bb-00505697ac59:21509-232465
Executed_Gtid_Set:
7213a549-c19d-11e4-b6b8-00505697a71e:1-1013317200,
cf7877d6-c19d-11e4-b6bb-00505697ac59:1-232465,
fbdfd9ec-0937-11e5-89a3-00505697fdb5:1-645

there seems to be two sets received, and this may confuse replication of
server-c



When using the standard type of MySQL-replication, this type of adding
data in the middle slave/master works ok.

Truls Bergskaug

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