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https://issues.apache.org/jira/browse/HDFS-9627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Clampffer updated HDFS-9627:
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    Attachment: HDFS-9627.HDFS-8707.001.patch

-renamed headers to avoid conflict, left hdfs_ext in include/libhdfspp for now. 
[~bobhansen] please let me know what you think about this.

-test now uses EXPECT_EQ rather than EXPECT_TRUE(foo == bar)

-added LIBHDFS_EXTERNAL modifier to hdfsGetLastError.  hdfs.h explicitly undefs 
that macro at the end which is a bit of a bummer.  Copied the definition into 
hdfs_ext.h and added a comment explaining.  Still including hdfs.h in case 
other bits want to use the same typedefs like hdfsFS, tSize etc.  If the 
copy/paste of the macro definition looks like a maintenance issue it might be 
easier just to strip it out.  It isn't changing anything on unix systems; not 
sure if it makes a difference on windows.

-declared hdfsGetLastError as extern "C"

> 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, HDFS-9627.HDFS-8707.001.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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