Simon Willison’s Weblog

2 items tagged “upgrades”

Zero-downtime Redis upgrade discussion. GitHub have a short window of scheduled downtime in order to upgrade their Redis server. I asked in their comments if they’d considered trying to run the upgrade with no downtime at all using Redis replication, and Ryan Tomayko has posted some interesting replies. # 28th May 2010, 2:50 pm

Question: how do you upgrade servers when you need to pass new information between them? It’s a fool’s game to try to upgrade both servers at the same time. So you need a communication protocol that is not only backward compatible (a new server can speak the old protocol) but also forward compatible (an old server can speak the new protocol). Protocol Buffers provide that because new additions to the protocol can be ignored by the old server.

Matt Cutts # 8th July 2008, 9:11 am