On 23 Apr 2014, at 16:38, Tommaso Boccali <[log in to unmask]> wrote:

ah sorry, I forgot you question about versions ..
we use xrootd client bundles with CMSSW releases ... for Run1 data I see

lrwxrwxrwx 1 498 497 54 Mar 1 00:27 xrdcp -> ../../../../../../external/xrootd/3.1.0-cms2/bin/xrdcp

so quite older than yours. About ROOT, that also comes from the release, and it is

lrwxrwxrwx 1 498 497 53 Mar 1 00:27 root.exe -> ../../../../../../lcg/root/5.32.00-cms21/bin/root.exe

eventually, these are difficult to change, since they come with the full sw stack....

ciao ciao

tom

On Wed, Apr 23, 2014 at 4:20 PM, Tommaso Boccali <[log in to unmask]> wrote:
Ok , I came back and was able to do some more tests:
- DNS seems fine:

-bash-3.2$ dig xrootd-cms.infn.it

; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> xrootd-cms.infn.it
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34947
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 6

;; QUESTION SECTION:
;xrootd-cms.infn.it. IN A

;; ANSWER SECTION:
xrootd-cms.infn.it. 69424 IN A 90.147.66.75
xrootd-cms.infn.it. 69424 IN A 193.205.76.83
…

so they are the same records as yours.

- I can still consistently get a failure with:

xrdcp -d 1 root://xrootd-cms.infn.it///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root .

…
140423 16:13:49 001 Xrd: ShowUrls: The converted URLs count is 2
140423 16:13:49 001 Xrd: ShowUrls: URL n.1: root://xrootd-redic.pi.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root.
140423 16:13:49 001 Xrd: ShowUrls: URL n.2: root://xrootd.ba.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root.
140423 16:13:49 001 Xrd: ShowUrls: The converted URLs count is 2
140423 16:13:49 001 Xrd: ShowUrls: URL n.1: root://xrootd-redic.pi.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root.
140423 16:13:49 001 Xrd: ShowUrls: URL n.2: root://xrootd.ba.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root.
140423 16:13:49 001 Xrd: Connect: can't open connection to [xrootd-redic.pi.infn.it:1094]
140423 16:13:49 001 Xrd: XrdNetFile: Error creating logical connection to xrootd-redic.pi.infn.it:1094
140423 16:13:49 001 Xrd: Open: Connection attempt failed. Sleeping 5 seconds.
140423 16:13:54 001 Xrd: ShowUrls: The converted URLs count is 2
140423 16:13:54 001 Xrd: ShowUrls: URL n.1: root://xrootd-redic.pi.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root.
140423 16:13:54 001 Xrd: ShowUrls: URL n.2: root://xrootd.ba.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root.
140423 16:13:54 001 Xrd: Connect: can't open connection to [xrootd-redic.pi.infn.it:1094]
140423 16:13:54 001 Xrd: XrdNetFile: Error creating logical connection to xrootd-redic.pi.infn.it:1094
140423 16:13:54 001 Xrd: Open: Connection attempt failed. Sleeping 5 seconds.
140423 16:13:59 001 Xrd: ShowUrls: The converted URLs count is 2
140423 16:13:59 001 Xrd: ShowUrls: URL n.1: root://xrootd-redic.pi.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root.
140423 16:13:59 001 Xrd: ShowUrls: URL n.2: root://xrootd.ba.infn.it:1094///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root.
…

But: these machines, as well as CERN ones (at the very least), do use NSCD (so they cache the DNS answers). Could this be the problem? I was guessing it would not, since my understanding was that even Xrootd randomizes the entries got from DNS …
Can this be the problem? If yes, it would be tricky: we basically cannot ask sites to disable NSCD, sicne it is used to decrease load …

PS: maybe you can try directly

xrdcp -d 1 root://xrootd-cms.infn.it///store/test/xrootd/T2_IT_Pisa/store/mc/SAM/GenericTTbar/GEN-SIM-RECO/CMSSW_5_3_1_START53_V5-v1/0013/CE4D66EB-5AAE-E111-96D6-003048D37524.root .

it should work for anyone up to the point where you are redirected (redirectors are w/o authentication, servers are….)

to see if it works for you

ciao ciao

tom

On 19 Apr 2014, at 05:02, Andrew Hanushevsky <[log in to unmask]> wrote:

> Hi Tommaso,
>
> OK, I created a setup similar to yours. Specifically, in the DNS I have:
>
> abh-rdr.slac.stanford.edu. 600 IN A 134.79.120.146 // noric35
> abh-rdr.slac.stanford.edu. 600 IN A 134.79.120.152 // noric40
>
> I started a redirector on noric35 and left noric40 with nothing. I then did an xrdcp (using the old client) and it worked as expected (see the trace below). Some things to consider:
>
> 1) Was your DNS setup up as mine was (i.e. using A records)?
> 2) What was the release you were using? I used what is now R4 and 3.2.6 (a much older release) with identical results. The recoery code was not changed in the 3.2.x or the 3.3.x series. So, no suprise.
>
> My only assumption is that the DNS record was not setup in a way that the client expected (though, the trace seems to counter that notion). So, at the moment I am at a loss. Anyway, to cut down the only tracing chatter so as to make the output more readable, just use -d 1 which is good enough.
>
> Andy
>
> ./xrdcp -f -d 1 root://abh-rdr.slac.stanford.edu//tmp/motd /tmp/motd
> 140418 19:38:24 28376 Xrd: main: (C) 2004-2011 by the XRootD collaboration. Version: v20140318-ef1e4ab
> 140418 19:38:24 28376 Xrd: Create: (C) 2004-2010 by the Xrootd group. XrdClient $Revision$ - Xrootd version: v20140321-cdb721c
> 140418 19:38:24 28376 Xrd: ShowUrls: The converted URLs count is 2
> 140418 19:38:24 28376 Xrd: ShowUrls: URL n.1: root://noric40.slac.stanford.edu:1094//tmp/motd.
> 140418 19:38:24 28376 Xrd: ShowUrls: URL n.2: root://noric35.slac.stanford.edu:1094//tmp/motd.
> 140418 19:38:24 28376 Xrd: ShowUrls: The converted URLs count is 2
> 140418 19:38:24 28376 Xrd: ShowUrls: URL n.1: root://noric35.slac.stanford.edu:1094//tmp/motd.
> 140418 19:38:24 28376 Xrd: ShowUrls: URL n.2: root://noric40.slac.stanford.edu:1094//tmp/motd.
> 140418 19:38:24 28376 Xrd: Connect: can't open connection to [noric40.slac.stanford.edu:1094]
> 140418 19:38:24 28376 Xrd: XrdNetFile: Error creating logical connection to noric40.slac.stanford.edu:1094
> 140418 19:38:24 28376 Xrd: Open: Connection attempt failed. Sleeping 5 seconds.
> 140418 19:38:29 28376 Xrd: ShowUrls: The converted URLs count is 2
> 140418 19:38:29 28376 Xrd: ShowUrls: URL n.1: root://noric40.slac.stanford.edu:1094//tmp/motd.
> 140418 19:38:29 28376 Xrd: ShowUrls: URL n.2: root://noric35.slac.stanford.edu:1094//tmp/motd.
> 140418 19:38:29 28376 Xrd: Open: Access to server granted.
> 140418 19:38:29 28376 Xrd: Open: Opening the remote file /tmp/motd
> 140418 19:38:29 28376 Xrd: Open: File open in progress.
> 140418 19:38:29 28379 Xrd: HandleServerError: Received redirection to [rhel6-64b.slac.stanford.edu:1094]. Token=[]]. Opaque=[].
> 140418 19:38:29 28376 Xrd: main: root://abh-rdr.slac.stanford.edu//tmp/motd --> /tmp/motd
> 140418 19:38:29 28381 Xrd: Read: Hole in the cache: offs=0, len=1536
> [xrootd] Total 0.00 MB |====================| 100.00 % [inf MB/s]
>

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--
Tommaso Boccali
INFN Pisa

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