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Posted to issues@bookkeeper.apache.org by GitBox <gi...@apache.org> on 2021/11/30 11:15:51 UTC

[GitHub] [bookkeeper] Vanlightly commented on issue #2585: How does ledger open with recovery works internal ?

Vanlightly commented on issue #2585:
URL: https://github.com/apache/bookkeeper/issues/2585#issuecomment-982537657


   You can find the protocol described concisely in a TLA+ specification here: https://github.com/Vanlightly/bookkeeper-tlaplus/blob/main/BookKeeperProtocol.tla
   
   To answer your specific question, ledger recovery focuses on the last ensemble of the ledger. It starts at the highest known LAC of the ensemble of bookies and stops when it reaches the last unrecoverable entry. Unrecoverable means that no Ack Quorum of bookies have the entry. All entries up to that point get rewritten back to the ledger, and recovery completes when those entries have been committed (reached AQ).


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