[jira] [Assigned] (HDFS-5631) Expose interfaces required by FsDatasetSpi implementations

["Aaron T. Myers (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-5631?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aaron T. Myers reassigned HDFS-5631:
------------------------------------

    Assignee: David Powell

> Expose interfaces required by FsDatasetSpi implementations
> ----------------------------------------------------------
>
>                 Key: HDFS-5631
>                 URL: https://issues.apache.org/jira/browse/HDFS-5631
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 3.0.0
>            Reporter: David Powell
>            Assignee: David Powell
>            Priority: Minor
>         Attachments: HDFS-5631.patch, HDFS-5631.patch
>
>
> This sub-task addresses section 4.1 of the document attached to HDFS-5194,
> the exposure of interfaces needed by a FsDatasetSpi implementation.
> Specifically it makes ChunkChecksum public and BlockMetadataHeader's
> readHeader() and writeHeader() methods public.
> The changes to BlockReaderUtil (and related classes) discussed by section
> 4.1 are only needed if supporting short-circuit, and should be addressed
> as part of an effort to provide such support rather than this JIRA.
> To help ensure these changes are complete and are not regressed in the
> future, tests that gauge the accessibility (though *not* behavior)
> of interfaces needed by a FsDatasetSpi subclass are also included.
> These take the form of a dummy FsDatasetSpi subclass -- a successful
> compilation is effectively a pass.  Trivial unit tests are included so
> that there is something tangible to track.



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