Distributed: It is very convenient to expand and shrink Normal operation: Save our entire distributed cluster's configuration files and configuration information that need to be persisted. Once our cluster dies.

versions in ectd for data recovery, one is v2 and the other is v3. The v2 version will write all the data

based on HTTP. It has these components Raft: stores our read and write information (all information exists here) WAL: pre-write log: to prevent the information in Raft