Porting libhdfs to Windows
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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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