worryg0d commented on PR #1961:
URL:
https://github.com/apache/cassandra-gocql-driver/pull/1961#issuecomment-4842532365
The implementation in this patch fixes the regression by guarding from
synthetic CREATED events the same way as schema keyspace listeners are guarded.
Also, it adds a requirement that the internal metadata cache should be
enabled at least at the KeyspaceOnly level for Token Aware and Custom host
policies. But this is technically a breaking change for users who already have
custom policies and disabled metadata, so it's probably better to just log a
warning about it.
We can introduce an optional interface that would indicate if a policy
requires a metadata cache, and if a custom policy implements the interface,
omit the warning:
```
// MetadataRequiredPolicy is an interface that can be implemented by host
selection policies to indicate if they require the metadata cache to be enabled.
type MetadataRequiredPolicy interface {
RequiresMetadata() bool
}
```
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