1.2 Use Cases中 Commit Log官网剖析（博主推荐）

不多说，直接上干货！

　　一切来源于官网

http://kafka.apache.org/documentation/

Commit Log

提交日志

　　Kafka can serve as a kind of external commit-log for a distributed system. The log helps replicate data between nodes and acts as a re-syncing mechanism for failed nodes to restore their data. The log compaction feature in Kafka helps support this usage. In this usage Kafka is similar to Apache BookKeeper project.

kafka可以作为一种分布式的外部提交日志，日志帮助节点之间复制数据，并作为失败的节点来恢复数据重新同步，
kafka的日志压缩功能很好的支持这种用法，这种用法类似于Apacha BookKeeper项目。