Objectivity is falsifiability, subjectivity is individuality

MySQL Ecosystem

Courtesy:  DBMS2

As a follow-up to the latest Stonebraker kerfuffle, Derrick Harris asked me a bunch of smart followup questions. My responses and afterthoughts include:

  • Facebook et al. are in effect Software as a Service (SaaS) vendors, not enterprise technology users. In particular:
    • They have the technical chops to rewrite their code as  needed.
    • Unlike packaged software vendors, they’re not answerable to anybody for keeping legacy code alive after a rewrite. That makes migration a lot easier.
    • If they want to write different parts of their system on different technical underpinnings, nobody can stop them. For example …
    • …  Facebook innovated Cassandra, and is now heavily committed to HBase.
  • It makes little sense to talk of Facebook’s use of “MySQL.” Better to talk of Facebook’s use of “MySQL +  memcached  + non-transparent sharding.” That said:
    • It’s hard to see why somebody today would use MySQL +  memcached  + non-transparent sharding for a new project. At least one of Couchbase or transparently-sharded MySQL is very likely a superior alternative. Other alternatives might be better yet.
    • As noted above in the example of Facebook, the many major web businesses that are using MySQL +  memcached  + non-transparent sharding for existing projects can be presumed able to migrate away from that stack as the need arises.

Continuing with that discussion of DBMS alternatives:

  • If you just want to write to the memcached API anyway, why not go with Couchbase?
  • If you want to go relational, why not go with MySQL? There are many alternatives for scaling or accelerating MySQL — dbShards, Schooner, Akiban, Tokutek, ScaleBase, ScaleDB, Clustrix, and Xeround come to mind quickly, so there’s a great chance that one or more will fit your use case. (And if you don’t get the choice of MySQL flavor right the first time, porting to another one shouldn’t be all THAT awful.)
  • If you really, really want to go in-memory, and don’t mind writing Java stored procedures, and don’t need to do the kinds of joins it isn’t good at, but do need to do the kinds of joins it is, VoltDB could indeed be a good alternative.

And while we’re at it — going schema-free often makes a whole lot of sense. I need to write much more about the point, but for now let’s just say that I look favorably on the Big Four schema-free/NoSQL options of MongoDB, Couchbase, HBase, and Cassandra.

Related link:

New MySQL storage engines – rocket science or great engineering?

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