[jira] Commented: (HDFS-1489) breaking the dependency between FSEditLog and FSImage

["Todd Lipcon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-1489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928768#action_12928768 ] 

Todd Lipcon commented on HDFS-1489:
-----------------------------------

big +1, I was trying to work on this last week as well, but it gets really hairy.

HDFS-1473 is also related - I had a patch for that one, but HDFS-1435 complicated stuff a bit more.

> 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.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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