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https://issues.apache.org/jira/browse/HDFS-573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14081663#comment-14081663
]
Stephen Bovy commented on HDFS-573:
-----------------------------------
SAMPLE "Optional" INIT-LIB function :)
// FLAG :: init-lib invoked (speed up jvm-init and avoid locks)
extern short hdfs_JniInitLib;
extern char hdfs_HadoopHome [2000];
extern char hdfs_JavaHome [2000];
// the following are used for no-threads support
// use this flag to bypass thread logic
// enable non-threaded speed-ups
extern short hdfs_Threads;
// Init the HDFS library
int hdfsJNILibInit ( pHdfsInitParms parms )
{
JNIEnv* env;
// disable thread support for now.
hdfs_Threads = 0;
if ( parms ) {
if ( parms->JavaHome )
{
if ( strlen(parms->JavaHome) > 2000 ) {
fprintf ( stderr, "The JAVA_HOME variable is too long.\n" );
return 1;
}
strcpy ( hdfs_JavaHome, parms->JavaHome );
}
if ( parms->HadoopHome )
{
if ( strlen(parms->HadoopHome) > 2000 ) {
fprintf ( stderr, "The HADOOP_HOME variable is too long.\n" );
return 1;
}
strcpy ( hdfs_HadoopHome, parms->HadoopHome );
}
if (parms->threads)
hdfs_Threads = parms->threads;
}
env = getJNIEnv();
if (!env) return 1;
hdfs_JniInitLib = 1;
return 0;
}
> 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
> Attachments: HDFS-573.1.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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