Yeah, I agree... having a validation mode would be nice. We should be explicit that passing validation doesn't 100% guarantee that a subsequent call to create the topic will succeed, though. There is an obvious race condition there-- for example, with a plugin which consults some external authentication system, there could be a change to the privileges in between validation and attempted creation.
It also seems like we should try to provide a helpful exception message for the cases where topic creation fails. This might involve adding more detail about error conditions to CreateTopicsRequest... right now it just returns an error code, but a text message would be a nice addition. cheers, Colin On Thu, Jan 5, 2017, at 13:41, dan wrote: > it would be nice to have a dry-run or validate ability added to this kip. > since we are offloading validation to a 3rd party implementor a random > user > can't know a priori (based solely on kafka configs) whether a call should > succeed without actually creating the topic. > > a similar case is in connect where there is a separate endpoint > <https://github.com/apache/kafka/blob/trunk/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/rest/resources/ConnectorPluginsResource.java#L49-L58> > to attempt to validate a connect configuration without actually creating > the connector. > > thanks > dan > > > On Thu, Jan 5, 2017 at 7:34 AM, Ismael Juma <ism...@juma.me.uk> wrote: > > > Hi all, > > > > We've posted "KIP-108: Create Topic Policy" for discussion: > > > > https://cwiki.apache.org/confluence/display/KAFKA/KIP- > > 108%3A+Create+Topic+Policy > > > > Please take a look. Your feedback is appreciated. > > > > Thanks, > > Ismael > >
