Make catching_up_ flag durable
#562
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* If a new member joins a cluster but restarts while receiving the snapshot, its `catching_up_` flag will be cleared, causing the join process to stall. * To prevent this issue, the `catching_up_` flag will be stored as part of the `srv_state`. After the server restarts, the leader and the server will attempt the snapshot transmission again. * The `srv_state` format has been changed, but it will remain backward compatible.
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If a new member joins a cluster but restarts while receiving the snapshot, its
catching_up_flag will be cleared, causing the join process to stall.To prevent this issue, the
catching_up_flag will be stored as part of thesrv_state. After the server restarts, the leader and the server will attempt the snapshot transmission again.The
srv_stateformat has been changed, but it will remain backward compatible.