[jira] [Created] (BOOKKEEPER-581) Ledger recovery doesn't work correctly when recovery adds force changing ensembles.

["Sijie Guo (JIRA)" <ji...@apache.org>]

Sijie Guo created BOOKKEEPER-581:
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             Summary: Ledger recovery doesn't work correctly when recovery adds force changing ensembles.
                 Key: BOOKKEEPER-581
                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-581
             Project: Bookkeeper
          Issue Type: Bug
          Components: bookkeeper-client
    Affects Versions: 4.2.1, 4.2.0
            Reporter: Sijie Guo
            Assignee: Sijie Guo
            Priority: Critical
             Fix For: 4.3.0


currently read and write use same ledger metadata during ledger recovery, which is bad. since write will cause changing ensemble which modified ensembles map to introducing brand new bookies. those brand new bookies would mislead following recovery reads, cause recovery is proceeded in a wrong way.

E.g.

3 bookies, quorums size 2. A, B, C.

read 0 from A, B.
recovery add 0: A, B becomes slow. D, E are brought into the ensemble to replace A, B.
so following recovery read would be proceed in ensemble (D, E, C), then we would lost all the entries added in A and B.

this issue is similar as BOOKKEEPER-355.

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