diskcache redundancy
Online registration with gwrucio_registrar
crashes instantly if the diskcache cache file is unavailable. The diskcache
process itself seems to have survived ok so it looks like the file itself was temporarily unavailable.
Long-term: orchestrate services, including appropriate monitoring of functionality (diskcache cache file existence checks etc), so that diskcache is relaunched on failure.
Short term: catch this exception and wait/try again if the file is unavailable.