[wenc]

Anyone know why Facebook moved off HBase? (article doesn't address this)

I get that MyRocks is truly amazing, but I'm wondering what issues they were facing with HBase. I heard HBase was picked over Cassandra (developed at FB) because it was strongly consistent vs Cassandra's eventual consistency.

[ryanobjc]

at the time they picked HBase because it was easier to repair missing replicas. Hdfs namenode juat schedules block replication. Cassandra (at least the version they were considering) had to work a lot harder at replacing a missing replica. Remember they had a version that didn’t have workable merkel trees.

I also heard they had an issue with network flaps causing unrepairable inconsistency. I never got the full scoop on this.

I had worked with the engineers directly responsible for the HBase choice back when. All water under the bridge now it seems.

[tomnipotent]

My guess is operational experience, though the article mentions it was necessary to take advantage of Lightning. I can't think of another business on the planet that has pushed MySQL (and RDBMS' in general) further than FB.