Hi Enrico, Thanks for your response.
I’ve following queries on top of your response: * In general is community planning to test and support issues in rollback of Bookkeeper down the lane? * We might not frequently upgrade Bookkeeper unless it is demanded by Pulsar. In that case, we might skip few intermediate versions and upgrade directly to an higher version. In that case, are we foreseeing any compatibility change that will cause hinderance during rollback? * I’ve not fully gone through the internal working of Bookkeeper. But I would like to understand, can old version of bookie(after rollback) access the new data stored by upgraded bookie? Regards, Subash Kunjupillai From: Enrico Olivelli <[email protected]> Sent: 16 April 2020 16:05 To: user <[email protected]> Subject: Re: Rollback of Apache Bookeeper Hi Subash, usually by default there is no problem in rolling back to the previous version. For instance if you are running 4.9 and you upgrade to 4.10 your bookies you can downgrade to 4.9 just by using the old code. This is because we introduce new features but they are disabled by default at least for one release. But I suggest you to perform a test about the rollback before going to production Enrico Il giorno gio 16 apr 2020 alle ore 12:23 Subash K <[email protected]<mailto:[email protected]>> ha scritto: Hi, We are planning to introduce Apache Pulsar in our product. In general we always support upgrade and rollback of our product. So I'm trying to understand is there any defined steps provided to support rollback of Apache Bookeeper to its earlier version after completing full cluster upgrade? I was not able to find those information in https://bookkeeper.apache.org/docs/latest/admin/upgrade/<https://slack-redir.net/link?url=https%3A%2F%2Fbookkeeper.apache.org%2Fdocs%2Flatest%2Fadmin%2Fupgrade%2F&v=3> Regards, Subash Kunjupillai
