On Mar 24, 2012, at 12:18 AM, [email protected] wrote:

> 12/03/24 14:45:47 INFO ceph.CephFileSystem: initialize:Ceph initialization 
> arguments: CephFSInterface -k /data/keyring.mds.0 -n client.admin 
> --auth-supported=cephx  -m 192.168.122.201:6789 
> --client-readahead-max-periods=1
> 12/03/24 14:45:47 FATAL ceph.CephFileSystem: initialize:Ceph initialization 
> failed!
> Bad connection to FS. command aborted. exception: Ceph initialization failed!

Can you try turning on client debugging? In your Hadoop configuration file 
core-site.xml:

<property>
    <name>fs.ceph.commandLine</name>
    <value> --debug_client 20 --debug_ms 20</value>
</property>

> 
> I have traced the source code from java-side to ceph-side, and found the 
> connection between them failed to establish.

Where was the failure exactly? I suspect that the failure is occurring when 
ceph_mount(..) is being called.

- Noah--
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