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Date: Fri, 8 Jan 2016 14:39:39 +0000 (UTC)
From: "Bob Hansen (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-9627) libhdfs++: Add a mechanism to
 retrieve human readable error messages through the C API
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    [ https://issues.apache.org/jira/browse/HDFS-9627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15089282#comment-15089282 ] 

Bob Hansen commented on HDFS-9627:
----------------------------------

Additional minor comment: for consistency, we should mark the methods as {{LIBHDFS_EXTERNAL}}, which means including {{hdfs.h}}, which means we need to disambiguate the C {{hdfs.h}} from the libdhfdspp {{hdfs.h}} (which declares FileSystem and FileHandle).  Perhaps renaming this patch's {{hdfspp.h}} to {{hdfs_ext.h}} and renaming {{libhdfs/include/libhdfspp/hdfs.h}} to {{hdfspp.h}} is a good set of names?

Nothing is ever simple.

> libhdfs++: Add a mechanism to retrieve human readable error messages through the C API
> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-9627
>                 URL: https://issues.apache.org/jira/browse/HDFS-9627
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>         Attachments: HDFS-9627.HDFS-8707.000.patch, HDFS-9627.HDFS-8707.000.patch
>
>
> Libhdfs doesn't have this but libhdfs3 has a "hdfsGetLastErrorString" function.  The C API needs to be able to pass out error messages that are more specific than what errno can provide.
> This functionality should be exposed via a new public header in order to keep hdfs.h consistent with the libhdfs header.


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