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feat(split): meta failover during partition split #764
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When meta server restart, it will sync app and its partition info from zk (in function
sync_apps_from_remote_storage), for splitting partitions, its child partition has not been registered, could not be found on zk(gotERR_OBJECT_NOT_FOUND), this pull request is to solve this half-split case. If the not-found partition is child partition(partition_id >= app->partition_count / 2), init splitting status and update child partition in memory. This pull request also adds the related unit test.