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https://issues.apache.org/jira/browse/HDFS-1489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Kelly updated HDFS-1489:
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Attachment: HDFS-1489.diff
Changes to get SecondaryNameNode and import checkpoint working.
-Ivan
> breaking the dependency between FSEditLog and FSImage
> -----------------------------------------------------
>
> Key: HDFS-1489
> URL: https://issues.apache.org/jira/browse/HDFS-1489
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.21.0
> Reporter: Diego Marron
> Attachments: HDFS-1489.diff, HDFS-1489.diff, HDFS-1489.pdf
>
>
> This is a refactor patch which its main concerns are:
> - breaking the dependency between FSEditLog and FSImage
> - Splitting the abstracting the error handling and directory management,
> - Decoupling Storage from FSImage.
> In order to accomplish the above goal, we will need to introduce new classes:
> - NNStorage: Will care about the storage. It extends Storage class, and will
> contain the StorageDirectories.
> - NNUtils: Some utility static methods on FSImage and FSEditLog will be
> moved here.
> - PersistenceManager: FSNameSystem will now be responsible for managing the
> FSImage & FSEditLog objects. There will be some logic that will have to moved
> out of FSImage to facilite this. For this we propose a PersistanceManager?
> object as follows.
> For more deep details, see the design document uploaded.
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