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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7207) libhdfs3 should not expose exceptions in public C++ API
Date Wed, 08 Oct 2014 17:24:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14163818#comment-14163818
] 

Colin Patrick McCabe commented on HDFS-7207:
--------------------------------------------

Just to get everyone up to speed here, the current version of libhdfs3 that has been posted
has two APIs.  One is the C API described in {{hdfs.h}}.  The other is a new C\+\+ API.

It seems like those who don't want exceptions could simply use the the {{hdfs.h}} API.  That
API will always be better than a C\+\+ API anyway, since it will be practically impossible
to keep the C\+\+ ABI stable across versions.  If you want to try, you can read this: https://techbase.kde.org/Policies/Binary_Compatibility_Issues_With_C++

There are other advantages to using hdfs.h: it allows you to swap in {{libhdfs}} or {{libwebhdfs}}
when needed.

That being said, I have no objections to removing exceptions from the libhdfs3 public C\+\+
API.  But I also have no plans to use or maintain that API.

> libhdfs3 should not expose exceptions in public C++ API
> -------------------------------------------------------
>
>                 Key: HDFS-7207
>                 URL: https://issues.apache.org/jira/browse/HDFS-7207
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Haohui Mai
>            Priority: Blocker
>
> There are three major disadvantages of exposing exceptions in the public API:
> * Exposing exceptions in public APIs forces the downstream users to be compiled with
{{-fexceptions}}, which might be infeasible in many use cases.
> * It forces other bindings to properly handle all C++ exceptions, which might be infeasible
especially when the binding is generated by tools like SWIG.
> * It forces the downstream users to properly handle all C++ exceptions, which can be
cumbersome as in certain cases it will lead to undefined behavior (e.g., throwing an exception
in a destructor is undefined.)



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