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decrease _next_index when when the request with the minimum log #447

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@ehds ehds commented Apr 7, 2024

issue: #421


[ RUN      ] NodeTestWithPipelineReplication/NodeTest.change_peers_chaos_with_snapshot/0
F20240403 18:24:26.618824 18633 log_manager.cpp:321] Can't truncate logs before _applied_id=692, last_log_kept=0

当且仅当具有最小日志 index 的 send entries 的请求不匹配时,才去缩小 _next_index.
当 pipeline 开启,但是 cache 未开启时,具有较大日志的请求如果先被处理,response->success = false, 导致 _next_index 被缩小,如果此时 follower 节点加载了快照,那么 _next_index 有可能会小于快照的 last_log_index, 从而导致后续的复制都失败。

这里限制只有当最小的复制请求的日志不匹配时才有资格缩减 _next_index.

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