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Hello, On 4/13/22 03:32, CURRIE Robert wrote: > Hi, > > I had understood that the point of the XrdPfcCommand was to allow for a certain > file to be removed from the cache with a call to the service for testing. > https://github.com/xrootd/xrootd/blob/6b0209fd262f9f571e93daef17df1724dac8eed5/src/XrdPfc/XrdPfcCommand.cc#L268 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_xrootd_xrootd_blob_6b0209fd262f9f571e93daef17df1724dac8eed5_src_XrdPfc_XrdPfcCommand.cc-23L268&d=DwMFAw&c=-35OiAkTchMrZOngvJPOeA&r=f2PhPg2_OoVvPAKGXfp4WG1YcdhQC9qsy2uMHw3Z_6k&m=Q0Ppdm3qaiATZfNFVTPse_xNXAM1peod0ghaZwVHGVdPZCCjsc-6Tz9DNE5r3BBX&s=3Rw0ESc-NhqZ6eBu1VbW8pPgR7XdSEl-pvSjxqKKwSI&e=> > > I don't know if this is this still supported as I haven't tested it (yet). I've > just removed the files from disk and haven't had the server react badly from me > doing so, it just looks for the file, finds it missing and re-acquires it. Yes, this all works ... I use create_file for purge development as it gives you a way to quickly populate the cache (it creates file of the requested size with random data, whatever is in the blocks, without actually writing anything other than allocating the blocks). I used delete to remove redundant replicas of files in a caching cluster. Best way to use those two is through python scripts, but for a single delete xrdcp will work as well (if you configure the access correctly, please do not leave these exported to any user). > @Fabio Andrijauskas <mailto:[log in to unmask]> I've been looking into > modifying/expanding the Pfc recently at Edinburgh. > (nothing other than ugly local hacks on a test instance for now). > I think we're mainly interested from a cache performance improvement angle, and > possibly building a set of cache/purge decision libraries which we can > configure, but I've also been looking at the monitoring data with some interest > to compare it to our .cinfo file monitor. I have a couple of purge improvements planned as well. In particular, to support per directory quotas and to minimize/reduce the number of times the file system gets scanned. Best, Matevz > > Best Regards, > > Rob > > -------------------------------------------------------------------------------- > *From:* [log in to unmask] <[log in to unmask]> on behalf of > Andrew Hanushevsky <[log in to unmask]> > *Sent:* 13 April 2022 01:08 > *To:* Fabio Andrijauskas <[log in to unmask]> > *Cc:* [log in to unmask] <[log in to unmask]> > *Subject:* Re: Delete a file from rooted cache > > This email was sent to you by someone outside the University. > You should only click on links or attachments if you are certain that the email > is genuine and the content is safe. > > Hi Fabio, > > There is no way to flush (effectively delete) a file from the cache. We > have talked about providing such a feature but didn't have a use case for > it. Anyway, I assume you are logging into the Xcache server and physically > removing the files. As long as you do that when no one is using the file a > subsequent xrdcp should not hang. So, I suspect the timing was a bit off > or I don't understand the actual steps you were taking. > > Andy > > > On Tue, 12 Apr 2022, Fabio Andrijauskas wrote: > >> Hi Folks, >> >> I am improving the Xrootd cache monitoring on OSG, and I would like to >> check if the cache can provide a cached file and if the cache can fetch a >> file from the origin. To check the origin cache process, I want to delete a >> specific file on the cache and request this file on the client, in that way >> forcing the cache to fetch the origin file. >> >> I am deleting 4 files, two links, and two files related to this >> cached file. However, when I do that, the xrdcopy process hangs and >> timeout. So, I need to restart the cache to back to the regular operation. >> >> What is the right way to force the cache to fetch a file on the origin? >> >> >> >> *--Fábio Andrijauskas* >> >> ######################################################################## >> 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 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__listserv.slac.stanford.edu_cgi-2Dbin_wa-3FSUBED1-3DXROOTD-2DL-26A-3D1&d=DwMFAw&c=-35OiAkTchMrZOngvJPOeA&r=f2PhPg2_OoVvPAKGXfp4WG1YcdhQC9qsy2uMHw3Z_6k&m=Q0Ppdm3qaiATZfNFVTPse_xNXAM1peod0ghaZwVHGVdPZCCjsc-6Tz9DNE5r3BBX&s=JePPsv0o5YTLWUqXoTZ8VpHvRrxuV7sXgKd_z9mrtIc&e=> >> > > ######################################################################## > 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 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__listserv.slac.stanford.edu_cgi-2Dbin_wa-3FSUBED1-3DXROOTD-2DL-26A-3D1&d=DwMFAw&c=-35OiAkTchMrZOngvJPOeA&r=f2PhPg2_OoVvPAKGXfp4WG1YcdhQC9qsy2uMHw3Z_6k&m=Q0Ppdm3qaiATZfNFVTPse_xNXAM1peod0ghaZwVHGVdPZCCjsc-6Tz9DNE5r3BBX&s=JePPsv0o5YTLWUqXoTZ8VpHvRrxuV7sXgKd_z9mrtIc&e=> > The University of Edinburgh is a charitable body, registered in Scotland, with > registration number SC005336. Is e buidheann carthannais a th’ ann an Oilthigh > Dhùn Èideann, clàraichte an Alba, àireamh clàraidh SC005336. > -------------------------------------------------------------------------------- > > 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 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__listserv.slac.stanford.edu_cgi-2Dbin_wa-3FSUBED1-3DXROOTD-2DL-26A-3D1&d=DwMFAw&c=-35OiAkTchMrZOngvJPOeA&r=f2PhPg2_OoVvPAKGXfp4WG1YcdhQC9qsy2uMHw3Z_6k&m=Q0Ppdm3qaiATZfNFVTPse_xNXAM1peod0ghaZwVHGVdPZCCjsc-6Tz9DNE5r3BBX&s=JePPsv0o5YTLWUqXoTZ8VpHvRrxuV7sXgKd_z9mrtIc&e=> > > ######################################################################## 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