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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