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From "Ziliang Guo (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-573) Porting libhdfs to Windows
Date Wed, 26 Aug 2009 18:49:59 GMT
Porting libhdfs to Windows
--------------------------

                 Key: HDFS-573
                 URL: https://issues.apache.org/jira/browse/HDFS-573
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs client
         Environment: Windows, Visual Studio 2008
            Reporter: Ziliang Guo


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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