oldtiger

Results 7 issues of oldtiger

Fix: #9907 Test Plan: MULTIREAD_BATCHED=false ./tools/regression_test.sh

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if raft_sync is enabled and raft_sync_segments isn't enabled, it will cause data loss when the pre segment is closed.

某些场景下,我们需要在开始install snapshot的时候,才开始创建快照,需要一个回调函数能够知道leader开始发送install snapshot请求