I am migrating our production pulp instance from 2.7 to 2.10.

The data migration (triggered by pulp-manage-db) failed:

Applying migration pulp_rpm.plugins.migrations.0031_regenerate_repo_unit_counts failed.

Halting migrations due to a migration failure.
Cursor not found, cursor id: 102945255089
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/pulp/server/db/manage.py", line 194, in main
    return _auto_manage_db(options)
  File "/usr/lib/python2.7/site-packages/pulp/server/db/manage.py", line 257, in _auto_manage_db
    migrate_database(options)
  File "/usr/lib/python2.7/site-packages/pulp/server/db/manage.py", line 124, in migrate_database
    update_current_version=not options.test)
  File "/usr/lib/python2.7/site-packages/pulp/server/db/migrate/models.py", line 186, in apply_migration
    migration.migrate()
  File "/usr/lib/python2.7/site-packages/pulp_rpm/plugins/migrations/0031_regenerate_repo_unit_counts.py", line 48, in migrate
    for repo in repos_collection.find():
  File "/usr/lib64/python2.7/site-packages/pymongo/cursor.py", line 1114, in next
    if len(self.__data) or self._refresh():
  File "/usr/lib64/python2.7/site-packages/pymongo/cursor.py", line 1056, in _refresh
    self.__max_await_time_ms))
  File "/usr/lib64/python2.7/site-packages/pymongo/cursor.py", line 926, in __send_message
    codec_options=self.__codec_options)
  File "/usr/lib64/python2.7/site-packages/pymongo/helpers.py", line 123, in _unpack_response
    raise CursorNotFound(msg, 43, errobj)
CursorNotFound: Cursor not found, cursor id: 102945255089



The migration was added as part of 2.8.5 Pulp. This bug will be experienced by users with a large number of repositories.