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Existing API changes
The default ledger manager factory is changed from FlatLedgerManagerFactory to HierarchicalLedgerManagerFactory if ledgerManagerFactoryClass
is specified. If you have a cluster running with older versions and no ledgerManagerFactoryClass is set before, you need to set
ledgerManagerFactoryClass explicitly to org.apache.bookkeeper.meta.FlatLedgerManagerFactory in your bookie configuration before upgrade.