sodonnel commented on PR #11226:
URL: https://github.com/apache/ozone/pull/11226#issuecomment-5619736092
> The OBS-rejection check moves from the client to the OM. In a rolling
upgrade, a
new OFS client talking to an old OM will no longer reject getFileStatus on an
OBJECT_STORE bucket, because the old OM has no server-side check and the new
client
no longer performs the InfoBucket-based one. New-client/new-OM and
old-client/*
are unaffected. Flagging for reviewer sign-off on whether that upgrade
window needs
a version gate or a retained client-side fallback.
Thanks for including that detail here. I think this would need a version
gate, and it should be fairly simple. The client is already aware of the server
version as it gets it on the first RPC / handshake so we can just do:
```
if (server.version < NEW_FEATURE) {
old behavior
} else {
new behavior
}
```
I haven't been involved in this and I haven't looked at the code here beyond
the description, but I would tend to prefer a solution that doesn't have a
client side cache, as caching always proves more tricky than it first seems!
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