ivankelly opened a new pull request #2573: ManagedLedger only closes ledger on 
error if current ledger (#240)
URL: https://github.com/apache/incubator-pulsar/pull/2573
   If we have a managed ledger, ml and we write 2 entries to it, if both
   entries fail, both will end up calling ManagedLedgerImpl#ledgerClosed
   with the ledger the write failed on as a parameter.
   However, depending on timing, the second call to ledgerClosed could
   end up adding a new ledger to the ledger list, even though the current
   ledger is _not_ failing (as the failing ledger was replaced by the
   first call).
   This was the cause of a flake in
   ManagedLedgerErrorsTest#recoverLongTimeAfterMultipleWriteErrors as
   reported in (#240). However, it's not possible to get a deterministic
   test for this as the timings need to be very precise. The failing
   addComplete needs to run before first error handling completes, but
   the runnable with ledgerClosed for the second failure needs to run
   after the first error handling completes, but before the write resends
   from the first error handling complete.

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