Hi Hang,
The thing is that the BookKeeper replication protocol doesn't tolerate
bookies losing entries that it says it has stored safely. Ledger recovery
can end-up truncating ledgers leading to unrecoverable data loss that not
even the auditor check can recover. So this shrink and expand is
funda
Hi Jack,
Currently, if we use multi directories for journal or ledger in
one bookie, it will store specific ledger into target directory by
`ledgerId % numberOfLedgers`. If we expand or shrink the ledgers or
journal directories, it will break hash result value, which will lead
to some ledgers
