Re: [Moosefs-users] help (CUTOMA_FUSE_LOOKUP )

[Michał B. <mic...@ge...>]

The whole communication with the master is on the level of i-nodes not paths. So the system has to have possibility to remap path on the i-node number. Generally most regular file systems under unix work this way.

 

CUTOMA_FUSE_LOOKUP finds i-node number which is a descendant of i-node number N and name Y (N, Y)->M.

 

For example to find i-node number of object “foo/has/bar” you need to make three LOOKUP operations:

1.       LOOKUP(1, “foo”)->X

2.       LOOKUP(X, “has”)->Y

3.       LOOKUP(Y, “bar”)->Z

 

And we know that object “foo/has/bar” has i-node number Z. 

 

 

Kind regards

Michał Borychowski 

MooseFS Support Manager

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Gemius S.A.

ul. Wołoska 7, 02-672 Warszawa

Budynek MARS, klatka D

Tel.: +4822 874-41-00

Fax : +4822 874-41-01

 

From: 夏亮 [mailto:xia...@zh...] 
Sent: Thursday, August 12, 2010 5:33 AM
To: 'Michał Borychowski'
Subject: 答复: [Moosefs-users] help

 

Hi!

 

I want to know when client CUTOMA_FUSE_LOOKUP data to master, what should be inode seted.

thanks

 

  _____  

发件人: Michał Borychowski [mailto:mic...@ge...] 
发送时间: 2010年8月10日 15:47
收件人: '夏亮'
抄送: moo...@li...
主题: RE: [Moosefs-users] help

 

Hi!

 

Please share with us where you would see the usage of such an interface? We already have a mini-library for this but it is not very efficient. It would need some additional mechanisms as read-ahead, etc. On the other hand FUSE works nicely and smoothly, we are not sure there is really need for the additional c library. 

 

If you would like to contribute to the project probably there would some other issues you could take care of :)

 

 

Kind regards

Michał Borychowski 

MooseFS Support Manager

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Gemius S.A.

ul. Wołoska 7, 02-672 Warszawa

Budynek MARS, klatka D

Tel.: +4822 874-41-00

Fax : +4822 874-41-01

 

 

From: 夏亮 [mailto:xia...@zh...] 
Sent: Friday, August 06, 2010 4:41 AM
To: moo...@li...
Subject: [Moosefs-users] help

 

Hi :

         I am programmer used c language. I want to add c interface in moosefs , which used like lidhdfs of hadoop.

Could you give me some advice?

         thanks