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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-573) Porting libhdfs to Windows
Date Fri, 08 Aug 2014 16:33:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Nauroth updated HDFS-573:
-------------------------------

       Resolution: Fixed
    Fix Version/s: 2.6.0
                   3.0.0
           Status: Resolved  (was: Patch Available)

I've committed this to trunk and branch-2.  Thank you, Colin, for the very helpful code review.
 Thank you, Stephen, for the discussion of other potential improvements.

I also want to thank all of the original participants who got the ball rolling with this issue
back in 2009.  It feels really good to click the resolve button on a 5-year-old jira.  :-)

> Porting libhdfs to Windows
> --------------------------
>
>                 Key: HDFS-573
>                 URL: https://issues.apache.org/jira/browse/HDFS-573
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: libhdfs
>         Environment: Windows, Visual Studio 2008
>            Reporter: Ziliang Guo
>            Assignee: Chris Nauroth
>             Fix For: 3.0.0, 2.6.0
>
>         Attachments: HDFS-573.1.patch, HDFS-573.2.patch, HDFS-573.3.patch, HDFS-573.4.patch
>
>   Original Estimate: 336h
>  Remaining Estimate: 336h
>
> The current C code in libhdfs is written using C99 conventions and also uses a few POSIX
specific functions such as hcreate, hsearch, and pthread mutex locks.  To compile it using
Visual Studio would require a conversion of the code in hdfsJniHelper.c and hdfs.c to C89
and replacement/reimplementation of the POSIX functions.  The code also uses the stdint.h
header, which is not part of the original C89, but there exists what appears to be a BSD licensed
reimplementation written to be compatible with MSVC floating around.  I have already done
the other necessary conversions, as well as created a simplistic hash bucket for use with
hcreate and hsearch and successfully built a DLL of libhdfs.  Further testing is needed to
see if it is usable by other programs to actually access hdfs, which will likely happen in
the next few weeks as the Condor Project continues with its file transfer work.
> In the process, I've removed a few what I believe are extraneous consts and also fixed
an incorrect array initialization where someone was attempting to initialize with something
like this: JavaVMOption options[noArgs]; where noArgs was being incremented in the code above.
 This was in the hdfsJniHelper.c file, in the getJNIEnv function.



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