Hello,
I am trying to build an automated system in docker/kubernetes where a
container/pod will automatically schedule itself as a Master or Standby.
In short, I have 1 master nodes (0th node) and three standby nodes (1st,
2nd & 3rd node). When I make the 3rd node as master (by trigger file) and
restarts 0th node as a replica, It shows no problem.
But when, both nodes are offline and our leader selection chooses 0th node
as a master, and tries to reattach the 3rd node as Replica, It throws an
error similar to:
```
LOG: invalid record length at 0/B000098: wanted 24, got 0
LOG: started streaming WAL from primary at 0/B000000 on timeline 2
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
FATAL: terminating walreceiver process due to administrator command
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
LOG: record with incorrect prev-link 10000/21B0000 at 0/B000098
```
If I disable archive_mode, I never faced this error with same script. It
only apperas when archive is on, and also not all the times it happens but
most of the time it does.
The error message appears after every 5 seconds.
------------------------------------------------------------------------------------------------------------
Scenario In details:
I have two folders for scripts.
├── primary
│ ├── postgresql.conf
│ ├── restore.sh
│ ├── run.sh
│ └── start.sh
└── replica
├── recovery.conf
└── run.sh
I have a system that will choose the leader. If the current pod is leader,
it will run `primary/run.sh`, and If it is a replica, it will run
`replica/run.sh`. The problem is not related to restore.sh at this moment.
So I am skipping restore.sh.
The files can be found here.
https://github.com/kubedb/postgres/tree/master/hack/docker/postgres/9.6.7/scripts
