- Flink: https://flink.apache.org/
- Kafka: https://kafka.apache.org/
- Zookeeper: https://zookeeper.apache.org/
- Lucene: https://lucene.apache.org/
- Earlybird: Real-Time Search at Twitter
- ElasticSearch
Cache
- Memcache
- Redis
Ranking
- PageRank
Remove Duplicate
- MinHash
Gateway
Star Schema vs. Snowflake Schema