Re: [quicwg/base-drafts] Limit RCID state (#3547)

[Martin Thomson <[e-mail]>]

@martinthomson commented on this pull request.



> +An endpoint SHOULD limit the number of in flight RETIRE_CONNECTION_ID frames
+to bound the necessary state. In order to minimize delay in common situations,
+the limit on the number of in flight RETIRE_CONNECTION_IDs SHOULD be at least
+the active_connection_id_limit. An endpoint MAY choose to treat having too many
+connection IDs in need of retirement as a connection error of type
+CONNECTION_ID_LIMIT_ERROR.

```suggestion
When retiring a connection ID, an endpoint remembers a sequence number and maybe
a packet number for a RETIRE_CONNECTION_ID frame.  An endpoint SHOULD limit the
state it commits by limiting the number of connection IDs that it tracks for
retirement to at least twice the active_connection_id_limit. An endpoint MUST
NOT forget a connection ID without retiring it, though MAY choose to treat
having too many connection IDs in need of retirement as a connection error of
type CONNECTION_ID_LIMIT_ERROR.
```

I think that this is better than including a lot more words.  I've tweaked the last sentence to include a prohibition on forgetting connection IDs.

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