Hi Tommaso,
I have check the new client and it works as expected. I couldn't copy the
file because I am not authroized but it did find a working redirector.
Oddly enough, it also found things in Germany and the like. I assume you
redirect upstream? If not, then I need to check with Lukasz how he managed
to get to your global redirector.
I agree that the old client is broken. I don't know when that regression
happened as it worked the last time I checked this. The question is
whether we should fix the old client since with release 4 the old client
is deprecated and no one would actually use it even if it got fixed. R4 is
due out in the middle of May.
Andy
On Thu, 17 Apr 2014, Tommaso Boccali wrote:
> ciao Andrew!
> I think you do not need at this level, because by choice we have left the
> redirectors w/o authentication.
>
> So if you look to a command like
>
> xrdcp -d 10 root://
> xrootd-cms.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root.
>> &log
>
> (after a voms-proxy-destroy in my case) I still see the usual fixed order
>
> -bash-3.2$ grep ShowUrls log
> 140417 01:12:15 001 Xrd: ShowUrls: The converted URLs count is 2
> 140417 01:12:15 001 Xrd: ShowUrls: URL n.1: root://
> xrootd-redic.pi.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> 140417 01:12:15 001 Xrd: ShowUrls: URL n.2: root://
> xrootd.ba.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> 140417 01:12:15 001 Xrd: ShowUrls: The converted URLs count is 2
> 140417 01:12:15 001 Xrd: ShowUrls: URL n.1: root://
> xrootd-redic.pi.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> 140417 01:12:15 001 Xrd: ShowUrls: URL n.2: root://
> xrootd.ba.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> 140417 01:12:20 001 Xrd: ShowUrls: The converted URLs count is 2
> 140417 01:12:20 001 Xrd: ShowUrls: URL n.1: root://
> xrootd-redic.pi.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> 140417 01:12:20 001 Xrd: ShowUrls: URL n.2: root://
> xrootd.ba.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> ...
>
> eventually is this would not fail, then you would get an error when trying
> to access the real file, but at least in my case I "die" before.
>
> Of course for this to make sense I need to leave off one of the redirectors
> (xrootd-redic.pi.infn.it). Also, you can test the same behavior with
>
> xrdcp -d 10 root://xrootd-redic.pi.infn.it,
> xrootd.ba.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root.
>> & log1 &
>
> again, I get
>
> -bash-3.2$ grep ShowUrls log1
> 140417 01:15:59 001 Xrd: ShowUrls: The converted URLs count is 2
> 140417 01:15:59 001 Xrd: ShowUrls: URL n.1: root://
> xrootd-redic.pi.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> 140417 01:15:59 001 Xrd: ShowUrls: URL n.2: root://
> xrootd.ba.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> 140417 01:15:59 001 Xrd: ShowUrls: The converted URLs count is 2
> 140417 01:15:59 001 Xrd: ShowUrls: URL n.1: root://
> xrootd-redic.pi.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> 140417 01:15:59 001 Xrd: ShowUrls: URL n.2: root://
> xrootd.ba.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> 140417 01:16:04 001 Xrd: ShowUrls: The converted URLs count is 2
> 140417 01:16:04 001 Xrd: ShowUrls: URL n.1: root://
> xrootd-redic.pi.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> 140417 01:16:04 001 Xrd: ShowUrls: URL n.2: root://
> xrootd.ba.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
> .
> ...
>
>
> I try and leave the redirector OFF for the night, if you want to try. I
> hope I will not get big side effects :(
>
> tom
>
>
>
>
>
> On Thu, Apr 17, 2014 at 12:33 AM, Andrew Hanushevsky <[log in to unmask]>wrote:
>
>> Hi Tommaso,
>>
>> So I need a certificate to reproduce your test from here? I also can
>> supply you with access to xrdcopy if you happen to have AFS installed.
>>
>> Andy
>>
>> *From:* Tommaso Boccali <[log in to unmask]>
>> *Sent:* Tuesday, April 15, 2014 10:02 PM
>> *To:* Andrew Hanushevsky <[log in to unmask]>
>> *Cc:* [log in to unmask]
>> *Subject:* Re: problem with aliased redirectors
>>
>> ciao Andrew!
>> I have problems checking with xrdcopy, since that is not distributed with
>> CMS software, I have to find a way. For the moment, another hint something
>> is not ok in the randomization in xrdcp:
>>
>> I tried (with xrootd.ba.infn.it ON and xrootd-redic.pi.infn.it OFF)
>>
>> xrdcp -d 10 root://xrootd-redic.pi.infn.it,xrootd.ba.infn.it
>> //store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root<http://xrootd-cms.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root>.
>>
>> so putting explicitly the list of servers in the command line.
>> So, this always fails (xrootd-redic.pi.infn.it is always tried, 8 times,
>> and the other never reached).
>>
>> Instead
>>
>> xrdcp -d 10 root://xrootd.ba.infn.it,xrootd-redic.pi.infn.it
>> //store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root<http://xrootd-cms.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root>.
>>
>> always works at the first attempt.
>>
>> In any case, I think we basically care about the behavior of TFile::Open()
>> from our SW, not direct copy commands
>>
>>
>> This for example should not fail:
>>
>> root [5] TFile* ii = TFile::Open("root://xrootd-redic.pi.infn.it,
>> xrootd.ba.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
>> ")
>>
>> 140416 06:58:05 001 Xrd: Connect: can't open connection to [
>> xrootd-redic.pi.infn.it:1094]
>> 140416 06:58:05 001 Xrd: XrdNetFile: Error creating logical connection to
>> xrootd-redic.pi.infn.it:1094
>> Error in <TXNetFile::CreateXClient>: open attempt failed on root://
>> xrootd-redic.pi.infn.it,
>> xrootd.ba.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
>>
>> (does not seem to give a second try to the other server)
>>
>> and this seems even worse:
>>
>> root [7] TFile* ii = TFile::Open("root://
>> xrootd-cms.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
>> ")
>>
>> 140416 06:59:11 001 Xrd: Connect: can't open connection to [
>> xrootd-redic.pi.infn.it:1094]
>> 140416 06:59:11 001 Xrd: XrdNetFile: Error creating logical connection to
>> xrootd-redic.pi.infn.it:1094
>> Error in <TXNetFile::CreateXClient>: open attempt failed on root://
>> xrootd-cms.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
>>
>> so not even a second attempt is tried ....
>>
>> this instead works
>>
>> root [1] TFile* ii = TFile::Open("root://xrootd.ba.infn.it,
>> xrootd-redic.pi.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
>> ")
>>
>> 140416 07:01:18 001 Xrd: GoToAnotherServer: Going to:
>> t2-cms-xrootd01.desy.de:1094
>> 140416 07:01:18 001 Xrd: GoToAnotherServer: Going to:
>> dcache-cms-xrootd.desy.de:1094
>> 140416 07:01:18 001 Xrd: GoToAnotherServer: Going to:
>> 131.169.191.230:20982
>>
>> tommaso
>>
>>
>>
>>
>> On Tue, Apr 15, 2014 at 11:08 PM, Andrew Hanushevsky <[log in to unmask]>wrote:
>>
>>> Hi Tommaso,
>>>
>>> DNS round-robin, while it looks good in small scale tests, rarely works
>>> all that well. The reason is that DNS round-robins whenever a look-up is
>>> made regardless of the reason for the lookup. With a of clients that may
>>> very well lead to suboptimal ordering. So, the xrootd client gets all of
>>> the addresses and uses an algorithm that better spreads the access.
>>>
>>> As for why xrdcp didn˙˙t go after the seconds entry is mysterious but I
>>> would say it˙˙s a bug. Could you try the same test again but use xrdcopy?
>>> That˙˙s the new version of the client.
>>>
>>> Andy
>>>
>>> *From:* Tommaso Boccali <[log in to unmask]>
>>> *Sent:* Tuesday, April 15, 2014 3:48 AM
>>> *To:* [log in to unmask]
>>> *Subject:* Re: problem with aliased redirectors
>>>
>>> as additional info, the DNS seems to do well its RR job: from the same
>>> machine
>>>
>>> -bash-3.2$ host xrootd-cms.infn.it
>>> xrootd-cms.infn.it has address 193.205.76.83
>>> xrootd-cms.infn.it has address 90.147.66.75
>>> -bash-3.2$ host xrootd-cms.infn.it
>>> xrootd-cms.infn.it has address 90.147.66.75
>>> xrootd-cms.infn.it has address 193.205.76.83
>>> -bash-3.2$ host xrootd-cms.infn.it
>>> xrootd-cms.infn.it has address 90.147.66.75
>>> xrootd-cms.infn.it has address 193.205.76.83
>>> -bash-3.2$ host xrootd-cms.infn.it
>>> xrootd-cms.infn.it has address 90.147.66.75
>>> xrootd-cms.infn.it has address 193.205.76.83
>>> -bash-3.2$ host xrootd-cms.infn.it
>>> xrootd-cms.infn.it has address 193.205.76.83
>>> xrootd-cms.infn.it has address 90.147.66.75
>>>
>>> So each time the order returned is random, in case xrootd would need to
>>> depend on this
>>>
>>> BUT: inside xrdcp log, the order seems always to be the same (*)
>>>
>>> is some caching done inside xrdcp killing the RR?
>>>
>>> tom
>>>
>>> *:
>>>
>>> -bash-3.2$ grep DNS log
>>> 140415 12:32:21 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
>>> 140415 12:32:21 001 Xrd: ConvertDNSAlias: found host
>>> xrootd-redic.pi.infn.it with addr 193.205.76.83
>>> 140415 12:32:21 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.itwith addr 90.147.66.75
>>> 140415 12:32:21 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
>>> 140415 12:32:21 001 Xrd: ConvertDNSAlias: found host
>>> xrootd-redic.pi.infn.it with addr 193.205.76.83
>>> 140415 12:32:21 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.itwith addr 90.147.66.75
>>> 140415 12:32:26 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
>>> 140415 12:32:26 001 Xrd: ConvertDNSAlias: found host
>>> xrootd-redic.pi.infn.it with addr 193.205.76.83
>>> 140415 12:32:26 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.itwith addr 90.147.66.75
>>> 140415 12:32:31 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
>>> 140415 12:32:31 001 Xrd: ConvertDNSAlias: found host
>>> xrootd-redic.pi.infn.it with addr 193.205.76.83
>>> 140415 12:32:31 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.itwith addr 90.147.66.75
>>> 140415 12:32:36 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
>>> 140415 12:32:36 001 Xrd: ConvertDNSAlias: found host
>>> xrootd-redic.pi.infn.it with addr 193.205.76.83
>>> 140415 12:32:36 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.itwith addr 90.147.66.75
>>> 140415 12:32:41 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
>>> 140415 12:32:41 001 Xrd: ConvertDNSAlias: found host
>>> xrootd-redic.pi.infn.it with addr 193.205.76.83
>>> 140415 12:32:41 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.itwith addr 90.147.66.75
>>> 140415 12:32:46 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
>>> 140415 12:32:46 001 Xrd: ConvertDNSAlias: found host
>>> xrootd-redic.pi.infn.it with addr 193.205.76.83
>>> 140415 12:32:46 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.itwith addr 90.147.66.75
>>> 140415 12:32:51 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
>>> 140415 12:32:51 001 Xrd: ConvertDNSAlias: found host
>>> xrootd-redic.pi.infn.it with addr 193.205.76.83
>>> 140415 12:32:51 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.itwith addr 90.147.66.75
>>> 140415 12:32:56 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
>>> 140415 12:32:56 001 Xrd: ConvertDNSAlias: found host
>>> xrootd-redic.pi.infn.it with addr 193.205.76.83
>>> 140415 12:32:56 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.itwith addr 90.147.66.75
>>>
>>> On 15 Apr 2014, at 12:33, Tommaso Boccali <[log in to unmask]>
>>> wrote:
>>>
>>> Ciao,
>>> as from a previous discussion, we have setup an aliased DNS xrootd
>>> redirector,
>>>
>>> which is
>>>
>>> -bash-3.2$ host xrootd-cms.infn.it
>>> xrootd-cms.infn.it has address 90.147.66.75
>>> xrootd-cms.infn.it has address 193.205.76.83
>>>
>>> I was playing with some crash tests, and I do not get the result.
>>>
>>> So: I switched off the redirector 193.205.76.83, while keeping it into
>>> the alias, and I issued a
>>>
>>> xrdcp -d 10 root://
>>> xrootd-cms.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root.
>>>
>>> I was assuming that the client would have recognized the alias, and
>>> eventually tried a second host if the first was not available.
>>>
>>> In the log ( https://www.dropbox.com/s/zmp9uyreqm4qwhg/xrootd.log )
>>> I see eventually the client recognizes the situation:
>>>
>>>
>>> 140415 12:25:11 001 Xrd: ConvertDNSAlias: found host
>>> xrootd-redic.pi.infn.it with addr 193.205.76.83
>>> 140415 12:25:11 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.itwith addr 90.147.66.75
>>> 140415 12:25:11 001 Xrd: ShowUrls: The converted URLs count is 2
>>> 140415 12:25:11 001 Xrd: ShowUrls: URL n.1: root://
>>> xrootd-redic.pi.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
>>> .
>>> 140415 12:25:11 001 Xrd: ShowUrls: URL n.2: root://
>>> xrootd.ba.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
>>> .
>>>
>>> but then
>>>
>>> 140415 12:25:46 001 Xrd: Open: Trying to connect to
>>> xrootd-redic.pi.infn.it:1094. Connect try 8
>>> 140415 12:25:46 001 Xrd: XrdClientConn: Trying to connect to
>>> 193.205.76.83:1094
>>> 140415 12:25:46 001 Xrd: Connect: Creating a logical connection...
>>> 140415 12:25:46 001 Xrd: Connect: Physical connection not found. Creating
>>> a new one...
>>> 140415 12:25:46 001 Xrd: Connect: Connecting to [
>>> xrootd-redic.pi.infn.it:1094]
>>> 140415 12:25:46 001 Xrd: ClientSock::TryConnect_low: Trying to connect to
>>> xrootd-redic.pi.infn.it(193.205.76.83):1094 Windowsize=0 Timeout=120
>>> 140415 12:25:46 001 Xrd: ClientSock::TryConnect_low: Connection
>>> toxrootd-redic.pi.infn.it:1094 failed. (-1)
>>> 140415 12:25:46 001 Xrd: Connect: can't open connection to [
>>> xrootd-redic.pi.infn.it:1094]
>>> 140415 12:25:46 001 Xrd: PhyConnection: Disconnecting socket...
>>> 140415 12:25:46 001 Xrd: Connect: Connect(xrootd-redic.pi.infn.it, 1094)
>>> returned -1
>>> 140415 12:25:46 001 Xrd: XrdNetFile: Error creating logical connection to
>>> xrootd-redic.pi.infn.it:1094
>>> 140415 12:25:46 001 Xrd: Open: Disconnecting.
>>> 140415 12:25:46 001 Xrd: Cache: Cache Status --------------------------
>>> 140415 12:25:46 001 Xrd: Cache: --------------------------------------
>>> fTotalByteCount = 0
>>> Last server error 10000 ('')
>>> Error accessing path/file for root://
>>> xrootd-cms.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
>>>
>>> so no attempt is done on the other. What is wrong here? all in all it
>>> tries 8 times to connect to the SAME server, and 0 times to the other ...
>>>
>>>
>>> thanks a lot
>>>
>>> tom
>>>
>>> --
>>> Tommaso Boccali
>>> INFN Pisa
>>>
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>>>
>>>
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>>
>>
>>
>> --
>> Tommaso Boccali
>> INFN Pisa
>>
>> ------------------------------
>>
>> Use REPLY-ALL to reply to list
>>
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>>
>
>
>
> --
> Tommaso Boccali
> INFN Pisa
>
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