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From "James Clampffer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9144) Refactor libhdfs into stateful/ephemeral objects
Date Fri, 06 Nov 2015 16:40:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14993919#comment-14993919
] 

James Clampffer commented on HDFS-9144:
---------------------------------------

We're using this branch as an opportunity to try using github code reviews for the project.
 The reason for trying github is the nice code review tools for pull requests where comments
can be written inline with the relevant code.  Here's the link:
https://github.com/bobhansen/hadoop/pull/1/files

I still plan on including a higher level summary here once I finish adding inline comments.

> Refactor libhdfs into stateful/ephemeral objects
> ------------------------------------------------
>
>                 Key: HDFS-9144
>                 URL: https://issues.apache.org/jira/browse/HDFS-9144
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>    Affects Versions: HDFS-8707
>            Reporter: Bob Hansen
>            Assignee: Bob Hansen
>         Attachments: HDFS-9144.HDFS-8707.001.patch, HDFS-9144.HDFS-8707.002.patch
>
>
> In discussion for other efforts, we decided that we should separate several concerns:
> * A posix-like FileSystem/FileHandle object (stream-based, positional reads)
> * An ephemeral ReadOperation object that holds the state for reads-in-progress, which
consumes
> * An immutable FileInfo object which holds the block map and file size (and other metadata
about the file that we assume will not change over the life of the file)



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