# TODO

* 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
