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One property BookKeeper satisfies is persistence: if an entry e is added to a ledger and the client receives a confirmation, then the last entry of the ledger once it is closed is at least e.
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To fence a ledger from the client API, you can simply open it using BookKeeper#asyncOpenLedger or BookKeeper#openLedger. If the ledger you are opening is currently being written to by another ledgerclient, it will automatically be fenced, and the writing client will receive a BKWriteException for any subsequent calls to LedgerHandle#addEntry/LedgerHandle#asyncAddEntry.
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