replication: fix potential panic during upgrades #17476
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tgross
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If the authoritative region has been upgraded to a version of Nomad that has new replicated objects (such as ACL Auth Methods, ACL Binding Rules, etc.), the non-authoritative regions will start replicating those objects as soon as their leader is upgraded. If a server in the non-authoritative region is upgraded and then becomes the leader before all the other servers in the region have been upgraded, then it will attempt to write a Raft log entry that the followers don't understand. The followers will then panic. Add same the minimum version checks that we do for RPC writes to the leader's replication loop.
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lgfa29
approved these changes
Jun 9, 2023
pkazmierczak
approved these changes
Jun 12, 2023
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Automatically backported to 1.5.x and hand backported to 1.4.x |
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If the authoritative region has been upgraded to a version of Nomad that has new replicated objects (such as ACL Auth Methods, ACL Binding Rules, etc.), the non-authoritative regions will start replicating those objects as soon as their leader is upgraded. If a server in the non-authoritative region is upgraded and then becomes the leader before all the other servers in the region have been upgraded, then it will attempt to write a Raft log entry that the followers don't understand. The followers will then panic.
Add same the minimum version checks that we do for RPC writes to the leader's replication loop.
This will need to be backported to 1.5.x but hand-picked over to 1.4.x because some of these changes are only in 1.5.x