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git merge + squash 在合并分支时，把多个 commit 整合成一个，保持主分支的历史更干净。
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Elasticsearch(ES)是一个分布式搜索引擎,它以**文档(JSON)的形式存储数据,使用 倒排索引(Inverted Index) 进行高效查询,同时支持分片(Shard)和副本(Replica)**以实现高可用性和扩展性.- Published on
Elasticsearch(ES)使用docker部署及维护- Published on
MongoDB分片需要手动指定片键。好的片键需要尽量平滑，否则会出现数据在多个节点中倾斜，导致集群性能下降。