NullPointException at LedgerDescriptor#cmpMasterKey
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Key: BOOKKEEPER-50
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-50
Project: Bookkeeper
Issue Type: Bug
Components: bookkeeper-server
Affects Versions: 3.4.0
Reporter: xulei
the LedgerDescriptor will be created when it is missed in LedgerCache.
NullPointException will be thrown out in the following case:
1. The ledger descriptor is created and cached to LedgerCache because of a
readEntry operation in bookie. The ledger descriptor was created without
setting master key (we don't know master key in a read request)
2. An addEntry is sent after 1 . since the ledger descriptor has been cached,
so addEntry will use it to compare master key. then NullPointException is
thrown out.
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