On Feb 27, 2008, at 11:27 AM, Ahmad Humayun wrote:
Thanks Arun for the comment :) That actually explains how the
libhdfs code
is minute.
So, okay, does that mean that when using the compiled libhdfs.so,
it call
dfs code to be run on JVM through JNI? If anyone has played with
libhdfs,
can they tell that do they somehow have to specify where the
original hadoop
code is lying while using libhdfs.so
Yes. libhdfs relies on the hadoop jars being specified by the
CLASSPATH env. variable. Please take a look at hadoop's build.xml,
specifically the 'test-libhdfs' target to see an example.
Arun
thanks,
regards,
Ahmad H.
On Thu, Feb 28, 2008 at 12:04 AM, Arun C Murthy <[EMAIL PROTECTED]>
wrote:
Ahmad,
On Feb 27, 2008, at 10:44 AM, Ahmad Humayun wrote:
Hello everyone,
Apparently no one knew the answer to my question :( Am I looking at
things
the right way or nobody has compared the libhdfs code to hdfs? Or
am I
completely wrong, libhdfs and hdfs has no difference at all?
libhdfs is a JNI-based wrapper around hdfs, so it invokes the
underlying java apis via JNI. It offers most of the functionality of
hdfs, but I'm not sure it has everything.
The hdfs java api is here:
http://hadoop.apache.org/core/docs/r0.16.0/api/org/apache/hadoop/fs/
FileSystem.html
Arun
regards,
On Mon, Feb 25, 2008 at 11:07 PM, Ahmad Humayun
<[EMAIL PROTECTED]>
wrote:
Hi there,
I was just playing with libhdfs and couldnt help see the
differences it
has with the hadoop.dfs package. The hadoop.dfs seems to be much
more
intensive then ifs c++ counterpart, libhdfs, on the amount of
functionality
it offers. Hmm.. am I wrong here?....am I looking at things the
wrong way?
Is libhdfs is cut-down part of hadoop.dfs. If so, what
functionality I'll
miss out on by using libhdfs.
Which files in the hadoop.dfs package provide similar functions as
libhdfs. In other words where in the dfs package I should look
for an
"apples to apples" comparison with the libhdfs.
thanks,
--
Ahmad Humayun
Research Assistant
Computer Science Dpt., LUMS
+92 321 4457315
--
Ahmad Humayun
Research Assistant
Computer Science Dpt., LUMS
+92 321 4457315
--
Ahmad Humayun
Research Assistant
Computer Science Dpt., LUMS
+92 321 4457315
