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https://issues.apache.org/jira/browse/HDFS-7416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14219923#comment-14219923
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Haohui Mai commented on HDFS-7416:
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I proposes to separate the responsibilities of {{NameNodeRpcServer}},
{{FSNameSystem}} and {{FSDirectory}} as the following:
* {{NameNodeRpcServer}}: implements serialization / deserialization of the
requests and the {{RetryCache}}.
* {{FSNameSystem}}: Implement barriers for safemode and HA, and the durability
of the namespace (i.e., calling {{logSync()}} at the appropriate places)
* {{FSDirectory}}: Implement the namespace. It persists the operation by
logging edit logs, but it should never call {{logSync()}}.
> Revisit the abstraction between NameNodeRpcServer, FSNameSystem and
> FSDirectory
> -------------------------------------------------------------------------------
>
> Key: HDFS-7416
> URL: https://issues.apache.org/jira/browse/HDFS-7416
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Haohui Mai
> Assignee: Haohui Mai
>
> {{NameNodeRpcServer}}, {{FSNameSystem}} and {{FSDirectory}} implement the
> namespace of the NN. In the current implementation the boundary of these
> classes are not fully clear.
> This jira tracks the efforts of clarifying the boundaries between these three
> classes so that they can be more easily maintained in the long term.
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