Error propagation from caching proxy / posix layer to remote client #613
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The above error was observed at NERSC ... I can not reproduce it at UCSD with current master. However, I do get "no such file or directory" error which is misleading. It seems proper reporting would require a new type of error message that would make it clear the problem is on the server/cache and not with the client setup. Client: [2017-11-16 12:25:03.069588 -0800][Debug ][XRootD ] [xrd-cache-1.t2:7777] Handling error while processing kXR_open (file: /store/user/matevz/A_FILE, mode: 00, flags: kXR_open_read kXR_async kXR_retstat ): [ERROR] Error response: Unknown error 3011. Server log: 171116 12:19:36 3530654 ofs_open: matevz.3530817:20@localhost Unable to open /store/user/matevz/A_FILE; no such file or directory |
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What do you propose beng the correct message?
…On Thu, 16 Nov 2017, Matev Tadel wrote:
The above error was observed at NERSC ... I can not reproduce it at UCSD with current master.
However, I do get "no such file or directory" error which is misleading. It seems proper reporting would require a new type of error message that would make it clear the problem is on the server/cache and not with the client setup.
Client:
[2017-11-16 12:25:03.069588 -0800][Debug ][XRootD ] [xrd-cache-1.t2:7777] Handling error while processing kXR_open (file: /store/user/matevz/A_FILE, mode: 00, flags: kXR_open_read kXR_async kXR_retstat ): [ERROR] Error response: Unknown error 3011.
[2017-11-16 12:25:03.069640 -0800][Debug ][File ] ***@***.***://xrd-cache-1.t2:7777//store/user/matevz/A_FILE] Open has returned with status [ERROR] Server responded with an error: [3011] Unable to open /store/user/matevz/A_FILE; no such file or directory
[2017-11-16 12:25:03.069651 -0800][Debug ][File ] ***@***.***://xrd-cache-1.t2:7777//store/user/matevz/A_FILE] Error while opening at xrd-cache-1.t2:7777: [ERROR] Server responded with an error: [3011] Unable to open /store/user/matevz/A_FILE; no such file or directory
[0B/0B][100%][==================================================][0B/s]
Run: [ERROR] Server responded with an error: [3011] Unable to open /store/user/matevz/A_FILE; no such file or directory
Server log:
171116 12:19:36 3530654 ofs_open: ***@***.*** Unable to open /store/user/matevz/A_FILE; no such file or directory
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#613 (comment)
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It should make it clear to the user that the problem is on the server side and that cache operators should be contacted to resolve the issue. I was thinking about "Server-side configuration problem (can not authenticate to remote origin)" to make it clear it is not this clients authentication that is failing. How clear are the error codes you are getting from client in the first place? |
When caching proxy fails to connect to origin server due to missing CA packages (and possibly due to any authorization related problem) the report on the connecting client reports this as "too many levels of symbolic links".
E.g. from xrdcp
bash-4.1$ xrdcp root://cori21-224.nersc.gov:1094//store/mc/RunIISummer17PrePremix/Neutrino_E-10_gun/GEN-SIM-DIGI-RAW/MCv1_92X_upgrade2017_realistic_v8-v1/110012/265C18D7-C575-E711-8124-A0369FC5D5D8.root /dev/null
[0B/0B][100%][==================================================][0B/s]
Run: [ERROR] Server responded with an error: [3005] Unable to open /store/mc/RunIISummer17PrePremix/Neutrino_E-10_gun/GEN-SIM-DIGI-RAW/MCv1_92X_upgrade2017_realistic_v8-v1/110012/265C18D7-C575-E711-8124-A0369FC5D5D8.root; too many levels of symbolic links
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