I see. thanks Al.

--
Wei Yang  |  [log in to unmask]  |  650-926-3338

________________________________________
From: Albert Rossi <[log in to unmask]>
Sent: Thursday, May 9, 2019 10:58 AM
To: Yang, Wei; Michal Kamil Simon; xrootd-dev
Cc: Dmitry O Litvintsev
Subject: Re: delegation and the tpc.key

Hi Wei,


The client opens and closes the file on the source during the "placement" phase.   What it no longer does (when there is delegation) is to open it again during the copy phase.  So instead of two open/close requests on the source you only see one.


Al


________________________________________________
Albert L. Rossi
Application Developer & Systems Analyst III
Scientific Computing Division, Data Movement Development
FCC 229A
Mail Station 369 (FCC 2W)
Fermi National Accelerator Laboratory
Batavia, IL 60510
(630) 840-3023
________________________________
From: Yang, Wei <[log in to unmask]>
Sent: Thursday, May 9, 2019 12:46:48 PM
To: Michal Kamil Simon; Albert Rossi; xrootd-dev
Cc: Dmitry O Litvintsev
Subject: Re: delegation and the tpc.key

Hi Michal,

Is this a change in the client only? and is it after 4.9.1 was releases? I am using 4.9.1 client and a server (4.9.0rc5?) and I can see that the client opens file with both source and destination?

I am just curious. I think the change is good but not sure when should I expect to see it.

regards,
--
Wei Yang  |  [log in to unmask]  |  650-926-3338

________________________________________
From: [log in to unmask] <[log in to unmask]> on behalf of Michal Kamil Simon <[log in to unmask]>
Sent: Thursday, May 9, 2019 7:59 AM
To: [log in to unmask]; xrootd-dev
Cc: Dmitry Litvintsev
Subject: RE: delegation and the tpc.key

Hi Albert,

That's correct, in case of third-party-copy with delegation we optimized away
opening of the source and setting up the rendex-vous as the destination is now
able to proceed on its own.

Cheers,
Michal
________________________________
From: [log in to unmask] [[log in to unmask]] on behalf of Albert Rossi [[log in to unmask]]
Sent: 09 May 2019 16:11
To: xrootd-dev
Cc: Dmitry Litvintsev
Subject: delegation and the tpc.key


Hi everyone,


I have noticed something interesting about the behavior of the xrootd server/client on TPC with 4.9.  I had not noticed this before because I had not looked at verbose debug output, since everything seemed to be working.


What I notice is the following:


  1.   Where before the client (xrdcp) used to do an open on the source again during the copy phase, I no longer see this occurring.
  2.   At the same time, the destination server (i.e., the server-side xrdcp client) does not pass the tpc.key to the source server on open.   I noticed this because my own logging was reporting "not a tpc open" at that point.

Everything is working fine, but I just wanted to make sure what I am seeing is correct.  Am I correct in concluding that if delegation has occurred, the xrootd server stops using the tpc token?

Thanks,  Al


________________________________________________
Albert L. Rossi
Application Developer & Systems Analyst III
Scientific Computing Division, Data Movement Development
FCC 229A
Mail Station 369 (FCC 2W)
Fermi National Accelerator Laboratory
Batavia, IL 60510
(630) 840-3023

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