 |
 |
Hi Teng, thank you for the suggestion, I had seen that and don't think it's an option. I believe that forcing clients to install things is not compatible with the idea of a generic service. Moreover I plan to investigate the usage of XrdHttp on top of Pss, and I can't modify browsers, I am not powerful enough, yet :-P Fabrizio On 02.03.18 11:07, Teng Li wrote: > Hi Fabrizio, > > I've been working on XCache integration of ATLAS and had the same > problem as you do. The xrootd client plugin provides a fast solution of > using different urls for reading/writing. > > https://github.com/feipengsy/XrdCLROProxyPlugin > > After installing the client-side plugin above (and configuring > /etc/xrootd/client.plugins.d/ProxyRW-plugin.conf), the url of reading > activity will be prefixed with the XCache server address while the url > of writing stays unchanged. That's currently I'm doing tests with. Hope > it could help. > > Cheers, > Teng > > > Quoting Fabrizio Furano <[log in to unmask]> on Fri, 2 Mar 2018 10:29:59 +0100: > >> Hi Andy, >> >> thanks for the hints. My opinion is that a passthrough option would be >> a very big plus for the caching proxy, and I was sincerely surprised >> by this limitation. >> >> For some of our use cases I believe that we will start using it without >> caching, as I can't imagine how to give a transparent service by having >> to force clients to use different paths for reading and writing. >> >> What do you think ? >> >> Thank you >> Fabrizio >> >> On 03/01/2018 06:09 PM, Andrew Hanushevsky wrote: >>> Correct, we don't support a writable cache because that's not what a >>> cache is all about. Does the origin support writes? If so, >>> we could potentially provide a cache passthrough option. Otherwise, >>> if the readable and writable path differ, he could have run >>> two proxies -- one caching for read access and a passthru proxy for >>> writing then setup a redirect directive in the primary proxy >>> (i.e. the one that will be initially used) to direct writes to the >>> passthru proxy based on path. >>> >>> Andy >>> >>> On Thu, 1 Mar 2018, Fabrizio Furano wrote: >>> >>>> Hi, >>>> >>>> Mihai is trying to setup a small Pss machine that also works as a >>>> cache. >>>> >>>> For reading it seems to work fine, yet it stubbornly refuses to >>>> write files with >>>> this error: >>>> >>>>> 180301 17:27:38 13788 XrdFileCache_Manager: debug Cache::Attach() >>>>> root:[log in to unmask]:1094//eos/xdc/testing/hello.txt?&oss.asize=14&oss.lcl=1 >>>>> location: <deferred open> >>>>> 180301 17:27:38 13788 root.3008:20@xdc-test-fst1 ofs_fstat: >>>>> fn=/eos/xdc/testing/hello.txt >>>>> 180301 17:27:38 13788 root.3008:20@xdc-test-fst1 XrootdResponse: >>>>> 0100 sending 46 data bytes; status=0 >>>>> 180301 17:27:38 13788 root.3008:20@xdc-test-fst1 XrootdProtocol: >>>>> 0100 req=write dlen=14 >>>>> 180301 17:27:38 13788 root.3008:20@xdc-test-fst1 XrootdProtocol: >>>>> 0100 fh=0 write 14@0 >>>>> 180301 17:27:38 13788 root.3008:20@xdc-test-fst1 ofs_write: 14@0 >>>>> fn=/eos/xdc/testing/hello.txt >>>>> 180301 17:27:38 13788 ofs_write: root.3008:20@xdc-test-fst1 Unable >>>>> to write /eos/xdc/testing/hello.txt; operation not supported >>>>> 180301 17:27:38 13788 root.3008:20@xdc-test-fst1 XrootdProtocol: >>>>> 0100 discarding 0 bytes >>>>> 180301 17:27:38 13788 root.3008:20@xdc-test-fst1 XrootdResponse: >>>>> 0100 sending err 3005: Unable to write >>>>> /eos/xdc/testing/hello.txt; operation not supported >>>>> 180301 17:27:38 13788 root.3008:20@xdc-test-fst1 XrootdProtocol: >>>>> 0100 req=close dlen=0 >>>>> 180301 17:27:38 13788 root.3008:20@xdc-test-fst1 ofs_close: use=1 >>>>> fn=/eos/xdc/testing/hello.txt >>>> >>>> If we remove the directive pss.cachelib then writes work instead. >>>> >>>> Can anyone give us a clue please ? >>>> >>>> Thank you >>>> Fabrizio and Mihai >>>> >>>> >>> >> >> >> ######################################################################## >> Use REPLY-ALL to reply to list >> >> To unsubscribe from the XROOTD-L list, click the following link: >> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1 >> > > > > ---------------------------------------------------------------------- > Teng LI, PDRA > School of Physics and Astronomy, University of Edinburgh > > Email: [log in to unmask] > Telephone: +44 (0) 742 2910721 > > Room 5412, James Clerk Maxwell Building, > Kings Buildings, Peter Guthrie Tait Road > Edinburgh EH9 3FD, United Kingdom > ---------------------------------------------------------------------- > ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1