Hi Mongo community， 

Recently, am adding a new member from mongo replica set (Total size 500GB+).

There is an error : 

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2022-08-21T00:45:12.381+0800 W REPL     [repl writer worker 5] database 'DB_TAE' (4 of 6) clone failed due to InitialSyncFailure: Failed to clone 1 collection(s) in 'DB_TAE' from 10.25.14.185:27067
2022-08-21T00:45:12.381+0800 I REPL     [repl writer worker 5] Finished cloning data: InitialSyncFailure: Failed to clone 1 collection(s) in 'DB_TAE' from 10.25.14.185:27067. Beginning oplog replay.
2022-08-21T00:45:12.381+0800 I REPL     [replication-557] Finished fetching oplog during initial sync: CallbackCanceled: error in fetcher batch callback: oplog fetcher is shutting down. Last fetched optime and hash: { ts: Timestamp(1661013931, 4), t: 25 }[-9216962259998492407]
2022-08-21T00:45:12.381+0800 I REPL     [replication-557] Initial sync attempt finishing up.

...

...

2022-08-21T00:45:13.577+0800 I STORAGE  [replication-556] dropAllDatabasesExceptLocal 5

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Then the  initial sync will be started from the beginning again.  All the cloned the database were removed and started from zero. 

It can be reproduced.

PROD ENV：  

Mongo version :4.0.

OS  version:  Red Hat Enterprise Linux Server release 7.8 (Maipo)

Thanks
Jason