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https://issues.apache.org/jira/browse/HDFS-3190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13403590#comment-13403590
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Aaron T. Myers commented on HDFS-3190:
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+1, the latest patch looks good to me.
> Simple refactors in existing NN code to assist QuorumJournalManager extension
> -----------------------------------------------------------------------------
>
> Key: HDFS-3190
> URL: https://issues.apache.org/jira/browse/HDFS-3190
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Affects Versions: 2.0.0-alpha
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Minor
> Attachments: hdfs-3190.txt, hdfs-3190.txt, hdfs-3190.txt,
> hdfs-3190.txt
>
>
> This JIRA is for some simple refactors in the NN:
> - refactor the code which writes the seen_txid file in NNStorage into a new
> "LongContainingFile" utility class. This is useful for the JournalNode to
> atomically/durably record its last promised epoch
> - refactor the interface from FileJournalManager back to StorageDirectory to
> use a StorageErrorReport interface. This allows FileJournalManager to be used
> in isolation of a full StorageDirectory.
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