Hello Asher, Thanks so much for your hard work on supporting our MariaDB migration. I think that it's a big step for the MariaDB Foundation.
— Patrick On Tue, Dec 11, 2012 at 4:17 PM, Peter Youngmeister <p...@wikimedia.org> wrote: > Asher, > > This is awesome! Thank you for your hard, careful work and dedication in > taking this huge first step in moving to MariaDB! > > --peter > > > On Tue, Dec 11, 2012 at 4:10 PM, Asher Feldman <afeld...@wikimedia.org> > wrote: >> >> Hi, >> >> This afternoon, I migrated one of the main production English Wikipedia >> slaves, db59, to MariaDB 5.5.28. We've previously been testing 5.5.27 on >> the primary research slave, and I've been testing the current build for the >> last few days on a slave in eqiad. All has looked good, and I spent the >> last few days adapting our monitoring and metrics collection tools to the >> new version, and building binary packages that meet our needs. >> >> A main gotcha in major version upgrades is performance regressions due to >> changes in query plans. I've seen no sign of this, and my initial >> assessment is that performance for our workload is on par with or slightly >> improved over the 5.1 facebook patchset. >> >> Taking the times of 100% of all queries over regular sample windows, the >> average query time across all enwiki slave queries is about 8% faster with >> MariaDB vs. our production build of 5.1-fb. Some queries types are 10-15% >> faster, some are 3% slower, and nothing looks aberrant beyond those bounds. >> Overall throughput as measured by qps has generally been improved by 2-10%. >> I wouldn't draw any conclusions from this data yet, more is needed to filter >> out noise, but it's positive. >> >> MariaDB has some nice performance improvements that our workload doesn't >> really hit (better query optimization and index usage during joins, much >> better sub query support) but there are also some things, such as full >> utilization of the primary key embedded on the right of every secondary >> index that we can take advantage of (and improve our schema around) once >> prod is fully upgraded, hopefully over the next 1-2 months. >> >> The main goal of migrating to MariaDB is not performance driven. More so, >> I think it's in WMF's and the open source communities interest to coalesce >> around the MariaDB Foundation as the best route to ensuring a truly open and >> well supported future for mysql derived database technology. Performance >> gains along the way are icing on the cake. >> >> -Asher >> >> >> _______________________________________________ >> Ops mailing list >> o...@lists.wikimedia.org >> https://lists.wikimedia.org/mailman/listinfo/ops >> > > > _______________________________________________ > Ops mailing list > o...@lists.wikimedia.org > https://lists.wikimedia.org/mailman/listinfo/ops > _______________________________________________ Wikitech-l mailing list Wikitech-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikitech-l
