8.2 Upgrade Surprises

Occasional changes to Condor can cause unexpected errors or results to users. Here is a list of changes to note and be aware of.

• When upgrading from 6.6.x 6.7.x, jobs that rely on the environment variable CONDOR_SCRATCH_DIR need to be changed to use _CONDOR_SCRATCH_DIR. An underscore was added to the beginning of this variable.

• A necessary change was introduced in version 6.7.15, such that standard universe jobs are better identified and have more correct resumption semantics on other machines with proper platform identification signatures (which contain things such as operating system, OS distribution, and kernel memory model). This change affects all standard universe jobs that remain in the job queue across an upgrade from any Condor release previous to 6.7.15 to any Condor release of 6.7.15 or more recent.

  The resulting policy changes are documented in section 3.5.4.

  Suggestions for dealing with this backwards compatibility issue are given in the Frequently Asked Questions in section 7.1.