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From "Diego Marron (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1489) breaking the dependency between FSEditLog and FSImage
Date Fri, 05 Nov 2010 18:30:48 GMT
breaking the dependency between FSEditLog and FSImage
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                 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


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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