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Support use of xrootd by HEP experiments

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Subject:
From:
Heiko Schröter <[log in to unmask]>
Reply To:
Support use of xrootd by HEP experiments <[log in to unmask]>
Date:
Thu, 19 Apr 2018 14:37:20 +0200
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text/plain
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text/plain (84 lines)
I've been talking too fast. The stalling occurs with 4.8.3-rc1 as well. 
But only for the first connection of a file transfer.
If you rm and recopy the file, the stalling does not occur.


Am 19.04.2018 um 10:06 schrieb Michal Kamil Simon:
> Hi Heiko,
>
> That's interesting, could you give me more details on your scenario,
> are you using xrdcp from a script or XrdCl C++ API (or Python bindings)?
>
> Could you also provide client side logs from a run when you observed
> stalling?
>
> Cheers,
> Michal
> ________________________________________
> From: [log in to unmask] [[log in to unmask]] on behalf of Heiko Schröter [[log in to unmask]]
> Sent: 18 April 2018 20:26
> To: [log in to unmask]
> Cc: [log in to unmask]; [log in to unmask]
> Subject: Re: Stalling client when copying files (xrdcp 4.8.2)
>
> This stalling does not occur with the 4.8.3-rc1.
>
>
> Am 17.04.2018 um 19:24 schrieb Heiko Schröter:
>> Hello,
>>
>> we do observe that when copying a file the client is stalled for some time.
>>
>> 180417 19:17:28 17252 schroete.97360:7@qc08 XrootdProtocol: 0100
>> stalling client for 5 sec
>>
>> Sometimes it is for 10sec and this gets repeated without a recognizable
>> pattern.
>>
>> The client is not stalled when the copied file is removed at once and
>> recopied.
>>
>> It looks like a similar issue as this one:
>> https://listserv.slac.stanford.edu/cgi-bin/wa?A2=ind1203&L=XROOTD-L&P=R598&1=XROOTD-L&9=A&I=-3&J=on&d=No+Match%3BMatch%3BMatches&z=4
>>
>>
>> Is this a settable parameter or something we did wron in our setup ?
>>
>> We have one redirector and 12 data server on a 10GBit network. Client
>> access is very limited because this is a test setup.
>>
>> Regards
>> Heiko
>>
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-- 
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Dipl.-Ing. Heiko Schröter
Institute of Environmental Physics (IUP)   phone: ++49-(0)421-218-62092
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University of Bremen (FB1)
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