How to update peer's blockstore when the whole topology changed

[mversic]

I wounder how we should deal with more general case when whole topology changed.

Step by step:

1. Network is started with peer set A
2. After some height peer set A is replaced with peer set B (A intersection B = empty set)
3. New peer is added with trusted peers peers from set B
4. Peer get block and update it's topology to set A (because at this height only peers from topology A were present)

Originally posted by @Erigara in #4142 (comment)

[mversic]

@dima74 will #5117 take care of this?

[dima74]

@dima74 will #5117 take care of this?

If all peer public keys are also changed, then no. Since we establish connection only with peers which public keys our peer know

[mversic]

@dima74 will #5117 take care of this?

If all peer public keys are also changed, then no. Since we establish connection only with peers which public keys our peer know

public key of a peer cannot change. That requires re-registering a peer

[dima74]

From the issue description:

After some height peer set A is replaced with peer set B (A intersection B = empty set)

I mean if there is no such peer in set B so that its public key equals public key of some peer in set A. In such case #5117 will not help