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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8345) Storage policy APIs must be exposed via the FileSystem interface
Date Fri, 15 May 2015 21:08:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14546173#comment-14546173
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Arpit Agarwal commented on HDFS-8345:
-------------------------------------

bq. That's not so bad. Is there a reason not to include a convenience method that just takes
a BlockStoragePolicySpi object directly?
That doesn't sound useful enough to introduce one more FileSystem API. Can you think of an
example where the extra API call would simplify application code?

bq. Can you point me to the exposure? BlockStoragePolicy is IA.Private, and I would expect
we can use covariant return types to make a source-compatible update.
It was tagged IA.Private but returned via a LimitedPrivate interface, unfortunate as that
is. Changing the name, package or public interface of BlockStoragePolicy would technically
be incompatible. However if you suggest a better name for the new interface I'd be happy to
change it.

bq. The one in the docs: http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/filesystem/index.html
Okay let me file a separate Jira for that.

> Storage policy APIs must be exposed via the FileSystem interface
> ----------------------------------------------------------------
>
>                 Key: HDFS-8345
>                 URL: https://issues.apache.org/jira/browse/HDFS-8345
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.7.0
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>              Labels: BB2015-05-TBR
>         Attachments: HDFS-8345.01.patch, HDFS-8345.02.patch, HDFS-8345.03.patch, HDFS-8345.04.patch,
HDFS-8345.05.patch, HDFS-8345.06.patch
>
>
> The storage policy APIs are not exposed via FileSystem. Since DistributedFileSystem is
tagged as LimitedPrivate we should expose the APIs through FileSystem for use by other applications.



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