1) bookkeeper hang when openLedgerNoRecovery, since LedgerOpenOp didn't trigger callback when opening ledger no recovery.
2) race condition in ReadLastConfirmOp
ReadLastConfirmOp callback on readEntryComplete.
a) first decrement numResponsePending
b) then increment validResponses
c) check validResponses to callback with OK
b) check numResponsePending to callback with LedgerRecoveryException
support two callbacks returns on readEntryComplete: A, B. (quorum/ensemble size : 2)
a) A first decrement numResponsePending from 2 to 1.
b) A increment validResponses from 0 to 1.
c) B then decrement numResponsePending from 1 to 0.
d) A check numResponsePending before B check validResponse, A found the numResponsePending is 0 now. A will callback with exception. But the right action is B check validResponse and callback with OK.
3) if an LegerHandle is opened by openLedgerNoRecovery, the lastAddConfirmed will be set to -1. so all read requests will be failed since readEntry id > lastAddConfirmed.
so I suggested that if an LegerHandle is opened by openLegerNoRecovery, the ledgerHandle is under unsafeRead mode. close/write operations will be failed, read operations should not check condition entry_id > lastAddConfirmed.