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---
upgrade:
- |
The ``nova-manage db online_data_migrations`` command now returns exit
status 2 in the case where some migrations failed (raised exceptions) and
no others were completed successfully from the last batch attempted. This
should be considered a fatal condition that requires intervention. Exit
status 1 will be returned in the case where the ``--max-count`` option was
used and some migrations failed but others succeeded (updated at least one
row), because more work may remain for the non-failing migrations, and
their completion may be a dependency for the failing ones. The command
should be reiterated while it returns exit status 1, and considered
completed successfully only when it returns exit status 0.
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