Haohui Mai created HDFS-6315:
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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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