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https://issues.apache.org/jira/browse/HDFS-9144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bob Hansen updated HDFS-9144:
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Attachment: HDFS-9144.HDFS-8707.003.patch
Removed the Cancelation interface (which was simply for informative purposes).
The code still conflates the refactoring of the NN and DN together, for which I
apologize.
> 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, HDFS-9144.HDFS-8707.003.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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