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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6315) Decouple recoding edit logs from FSDirectory
Date Wed, 30 Apr 2014 21:45:19 GMT
Haohui Mai created HDFS-6315:
--------------------------------

             Summary: Decouple recoding edit logs from FSDirectory
                 Key: HDFS-6315
                 URL: https://issues.apache.org/jira/browse/HDFS-6315
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Haohui Mai
            Assignee: Haohui Mai
         Attachments: HDFS-6315.000.patch

Currently both FSNamesystem and FSDirectory record edit logs. This design requires both FSNamesystem
and FSDirectory to be tightly coupled together to implement a durable namespace.

This jira proposes to separate the responsibility of implementing the namespace and providing
durability with edit logs. Specifically, FSDirectory implements the namespace (which should
have no edit log operations), and FSNamesystem implement durability by recording the edit
logs.



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