jerrypeng edited a comment on issue #6787: URL: https://github.com/apache/pulsar/pull/6787#issuecomment-618205635
@sijie the default behavior of stored data in pulsar is not exactly the same as data stored in a file. By default data is not persisted in Pulsar at all. Only if a topic has a subscription or retention configured is the data actually persisted. Readers are by definition ephemeral and have no persistent state from a brokers perspective, thus if you want to Readers to able to read a certain amount of data, the user should configure the appropriate retention. Readers are responsible for reading the data and not to determine how much data is retained. I believe those are two separate concepts. I would recommend that is the correct workflow we should recommend users that want to use Readers. I would also argue that if you are using the Reader API and you want some level of guarantee of reading the data, you would have to configure retention. If you don't and the Reader dies, the data is not guaranteed to be there when the Reader comes back. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
