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https://issues.apache.org/jira/browse/BOOKKEEPER-50?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086975#comment-13086975
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xulei commented on BOOKKEEPER-50:
---------------------------------
Flavio, this issue is observed in ledger recovery, which will first read last
entry from ledger and write it back to make sure the last entry succeed in a
quorum of bookie server. the read operation needs to create the ledger
description since we have entries in ledger.
> 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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