Hey all,
This is a long-shot, but I've noticed before that libhdfs doesn't load
hadoop-site.xml *unless* hadoop-site.xml is in your local directory.
As a last try, maybe cd $HADOOP_HOME/conf and try running it from there?
Brian
On Jan 28, 2009, at 7:20 PM, Craig Macdonald wrote:
Hi Roopa,
Glad it worked :-)
Please file JIRA issues against the fuse-dfs / libhdfs components
that would have made it easier to mount the S3 filesystem.
Craig
Roopa Sudheendra wrote:
Thanks, Yes a setup with fuse-dfs and hdfs works fine.I think the
mount point was bad for whatever reason and was failing with that
error .I created another mount point for mounting which resolved
the transport end point error.
Also i had -d option on my command..:)
Roopa
On Jan 28, 2009, at 6:35 PM, Craig Macdonald wrote:
Hi Roopa,
Firstly, can you get the fuse-dfs working for an instance HDFS?
There is also a debug mode for fuse: enable this by adding -d on
the command line.
C
Roopa Sudheendra wrote:
Hey Craig,
I tried the way u suggested..but i get this transport endpoint
not connected. Can i see the logs anywhere? I dont see anything
in /var/log/messages either
looks like it tries to create the file system in hdfs.c but not
sure where it fails.
I have the hadoop home set so i believe it gets the config info.
any idea?
Thanks,
Roopa
On Jan 28, 2009, at 1:59 PM, Craig Macdonald wrote:
In theory, yes.
On inspection of libhdfs, which underlies fuse-dfs, I note that:
* libhdfs takes a host and port number as input when connecting,
but not a scheme (hdfs etc). The easiest option would be to set
the S3 as your default file system in your hadoop-site.xml, then
use the host of "default". That should get libhdfs to use the S3
file system. i.e. set fuse-dfs to mount dfs://default:0/ and all
should work as planned.
* libhdfs also casts the FileSystem to a DistributedFileSystem
for the df command. This would fail in your case. This issue is
currently being worked on - see HADOOP-4368
https://issues.apache.org/jira/browse/HADOOP-4368.
C
Roopa Sudheendra wrote:
Thanks for the response craig.
I looked at fuse-dfs c code and looks like it does not like
anything other than "dfs:// " so with the fact that hadoop can
connect to S3 file system ..allowing s3 scheme should solve my
problem?
Roopa
On Jan 28, 2009, at 1:03 PM, Craig Macdonald wrote:
Hi Roopa,
I cant comment on the S3 specifics. However, fuse-dfs is based
on a C interface called libhdfs which allows C programs (such
as fuse-dfs) to connect to the Hadoop file system Java API.
This being the case, fuse-dfs should (theoretically) be able
to connect to any file system that Hadoop can. Your mileage
may vary, but if you find issues, please do report them
through the normal channels.
Craig
Roopa Sudheendra wrote:
I am experimenting with Hadoop backed by Amazon s3 filesystem
as one of our backup storage solution. Just the hadoop and
s3(block based since it overcomes the 5gb limit) so far seems
to be fine.
My problem is that i want to mount this filesystem using fuse-
dfs ( since i don't have to worry about how the file is
written on the system ) . Since the namenode does not get
started with s3 backed hadoop system how can i connect fuse-
dfs to this setup.
Appreciate your help.
Thanks,
Roopa
