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https://issues.apache.org/jira/browse/HDFS-573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14081640#comment-14081640
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Stephen Bovy commented on HDFS-573:
-----------------------------------
Thanks Chris,
We have had some offline discussions before. Thanks for the explanation.
I have indeed added many enhancements. I would need to get management
permission to share these (sigh) :)
I have added optional support for dynamically loading the JVM. This simplifies
build issues, and solves a lot of configuration
usage issues.
I have indeed added an optional lib-init function and have also added
support for using a global static for the JVM pointer.
I have added support for a thread-flag, which can be statically set by the
compiler or dynamically set in the lib-init.
When the thread flag is not set I use a static global to save the thread-env
pointer which gets created when the jvm is
created, and I only need to utilize and access that one-pointer in one-place.
When the thread flag is not set, all the special thread code is bypassed with
IF statements
I have tested this in thread-mode with the thread-tester, and of course I am
using it with my app in non thread mode .
Works great either way.
> 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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