Percona Live ONLINE

When the MongoDB 4.4 release came out over the summer, it brought along several new features designed to improve performance overall. One of these was introducing Hedged Reads to address latency issues. High latency is annoying to end-users – just ask us. But that annoyance can lead to lost revenues. So… anything that can be safely done to reduce latency must be great right? We’ll see!
 
I’ll take us down into the grass and talk about what Hedged Reads are, how to enable and disable them, associated read preferences, how it determines which nodes to query for the results, and more. Then we’ll take a look at some query differences when enabled vs disabled and the performance benefits that may help get your application out of the weeds. And I’ll also address a few gotchas that might make you reconsider how bad those weeds really were.