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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1489) breaking the dependency between FSEditLog and FSImage
Date Mon, 20 Dec 2010 19:07:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973303#action_12973303
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Konstantin Shvachko commented on HDFS-1489:
-------------------------------------------

Ivan, would also consider making the patch against trunk rather than 0.22.

> 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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