Hi everyone! I'm excited to announce two talks we have on the schedule for March 2021: Persistent Bucket Notifications By Yuval Lifshitz https://ceph.io/ceph-tech-talks/ The stream starts on March 25th at 17:00 UTC / 18:00 CET / 1:00 PM EST / 10:00 AM PST Persistent bucket notifications are going to be introduced in Ceph "Pacific." The idea behind them is to allow for reliable and asynchronous delivery of notifications from the RADOS gateway (RGW) to the endpoint configured at the topic. Regular notifications could also be considered reliable since the delivery to the endpoint is performed synchronously during the request. However, this reliability is only from the RGW perspective, meaning that the client will not get an ACK until an ACK is received from the endpoint but does not retry if the endpoint is down or disconnected. Also, note that, with regular notifications, if the endpoint sends back a NACK, the operation is still considered successful (since there is no way to rollback the RADOS operations that happened before the notification was tried). When the endpoint is down but failed to push, the notification is only timeout base; using regular notifications will slow down the operation of the RGW and may bring it to a complete halt. With persistent notifications, we allow the RGW to retry sending notifications even if the endpoint is down or a network disconnect with it during the operation (notifications are retried if not successfully delivered to the endpoint). Also, the operation is a-synchronous, so during the operation, the notifications are just pushed into a queue (see below), and the actual sending to the endpoint is happening a-synchronously. The queuing operation is done in 2 phases (reserve and commit or abort) to guarantee the queuing operation's atomicity with the other operations. In case you missed the last Tech Talk, see Sage Weil's presentation on What's new in Pacific: https://www.youtube.com/watch?v=PVtn53MbxTc -------------- Samuel Just will be giving a code walkthrough on RADOS Snapshots. https://tracker.ceph.com/projects/ceph/wiki/Code_Walkthroughs The stream starts on March 23rd at 17:00 UTC / 18:00 CET / 1:00 PM EST / 10:00 AM PST In case you missed it, watch Part 2 of LibRBD I/O Flow by Jason Dillaman: https://www.youtube.com/watch?v=nVjYVmqNClM All live streams will be recorded. -- Mike Perez (thingee)