Mark Callaghan

CTO

United States24 yrs 3 mos experience

Highly Stable

Key Highlights

Expert in open source database architecture.
Led innovations in MySQL and RocksDB.
Proven track record in high-performance database systems.

Stackforce AI infers this person is a Database Architect with extensive experience in high-performance database systems.

Contact

Skills

Core Skills

MysqlDatabase ManagementDatabase Optimization

Other Skills

Transaction ProcessingStorage EfficiencyReplicationOnline Schema ChangeMongoDBRocksDBScalabilityGlobal Transaction IDsPythonSQLDistributed SystemsMultithreadingPerformance TuningC++C

About

I focus on open source database architecture with expertise in MySQL, Postgres and RocksDB. I offer consulting via Small Datum LLC.

Experience

24 yrs 3 mos

Total Experience

4 yrs

Average Tenure

Current Experience

Prounlimited

Member Of Technical Staff

Oct 2021 – Jan 2024 · 2 yrs 3 mos

Onsite at Meta

Rockset

Software Engineer

Jan 2021 – Jul 2021 · 6 mos

Small datum llc

Chief Technology Officer

Sep 2020 – Present · 5 yrs 8 mos

Mongodb

Distinguished Engineer

Dec 2019 – Sep 2020 · 9 mos

Working on the performance team

Facebook

Tech lead for MySQL engineering

Jan 2009 – Jan 2019 · 10 yrs

My focus is transaction processing and storage efficiency. My team supports large, sharded DBMS clusters that exceed 100M queries and disk reads per second. We continue to make MySQL much better. We have started to do the same for MongoDB and RocksDB, a write-optimized database engine. Our innovation with MySQL includes InnoDB compression for OLTP, replication prefetch, online schema change, group commit and online defragmentation. We continue the tradition with work-in-progress on DocStore and MyRocks.
Stay current via https://twitter.com/markcallaghan and http://smalldatum.blogspot.com.

Google

Tech lead for MySQL engineering

Jan 2005 – Jan 2009 · 4 yrs

We made MySQL much better for a very large and sharded MySQL cluster. Some of the features that we did first and ran at web scale include semi-sync replication, global transaction IDs, scalable read-write lock for InnoDB, user & table statistics, crash safe replication and roles.

Identity engines

Software Engineer

Jan 2005 – Jan 2005 · 0 mo

Oracle

Member of Technical Staff

Jan 1997 – Jan 2005 · 8 yrs

Fixed many bugs in the query execution engine and optimizer with a focus on bitmap indexes.
Rewrote in-memory sort:
http://www.google.com/patents/US7680791
http://www.oracle.com/technetwork/middleware/bi-foundation/twp-general-sort-performance-10gr2--1-128075.pdf
Added IEEE754 datatypes (binary_float, binary_double)