https://bugzilla.wikimedia.org/show_bug.cgi?id=68731

            Bug ID: 68731
           Summary: Backing up wikimetrics data fails if data is written
                    while we back it up
           Product: Analytics
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Wikimetrics
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected],
                    [email protected], [email protected],
                    [email protected], [email protected],
                    [email protected], [email protected]
       Web browser: ---
   Mobile Platform: ---

The run of the hourly script for 2014-07-28 05:00 failed with

  tar: /var/lib/wikimetrics/public/69987: file changed as we read it
  Error: Either failed to get lock on
/data/project/wikimetrics/backup/wikimetrics1/hourly, or tar-ing failed.

I checked locks, and they were properly cleaned up. So it seems the issue
was only that the file was written while we tried to tar it up.

Since we expect more writing over time, should we guard against this
from happening again?

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