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https://issues.apache.org/jira/browse/BOOKKEEPER-50?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086972#comment-13086972
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Flavio Junqueira commented on BOOKKEEPER-50:
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Hi Xulei, A read over an empty ledger shouldn't create a new ledger descriptor,
no? Perhaps the real problem is that we do create a ledger descriptor and we
shouldn't.
> NullPointException at LedgerDescriptor#cmpMasterKey
> ---------------------------------------------------
>
> 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
> Attachments: bookkeeper-50.patch
>
>
> 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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