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Note, the leader can only enable empty ISR after the new metadata version.

DowngradeMV downgrade: Once the MV version is downgraded, all the ELR related fields will be removed on the next partition change. The controller will also ignore the ELR fields.

Software downgrade: Not supported.

Clean shutdown

It will be guarded by a new metadata version. Before that, the controller will treat all the registrations with unclean shutdowns.

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