Details

    • Type: Improvement
    • Status: Closed
    • Priority: High
    • Resolution: Fixed
    • Affects Version/s: CernVM-FS 2.5.1
    • Fix Version/s: CernVM-FS 2.5.2
    • Component/s: CVMFS
    • Labels:
      None
    • Platforms:
      ANY
    • Development:

      Description

      I don't think there's anything to fix in cvmfs regarding this, but for documentation purposes, last week I saw the following /var/log/messages entries:

      Nov  9 09:30:16 dwdosgdev cvmfs2: (ligo.osgstorage.org) failed to fetch manifest (5 - outdated manifest), trying another stratum 1
      Nov  9 09:30:16 dwdosgdev cvmfs2: (ligo.osgstorage.org) switching host from http://cvmfs-s1fnal.opensciencegrid.org:8000/cvmfs/ligo.osgstorage.org to http://cvmfs-s1goc.opensciencegrid.org/cvmfs/ligo.osgstorage.org
      

      The squid in use for this case was a single machine squid.fnal.gov, but it has multiple workers that cache things independently. The stratum 1 is a single machine with a squid on it which also has multiple workers and which does not cache but forwards everything to an apache on the same machine. After following through all the log entries I came to the conclusion that it was most likely a problem in the squid-3.5.x installed on squid.fnal.gov, and filed a bug report with the squid project. It appears that squid is sending If-Modified-Since with some timestamp that it guessed at even though there was no Last-Modified field, and it guessed wrong.

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            • Assignee:
              dwd Dave Dykstra
              Reporter:
              dwd Dave Dykstra
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