ENV：
复制程序：
卷创建有效。在仪表板或Nova Cli中启动实例时，计算节点上的文件“/usr/lib/python2.7/dist-packages/nova/compute/manager.py”中的instance.save（）函数抛出了异常，第2273行。以下是带有debug = true的nova-compute日志文件中的跟踪：
**RemoteError: Remote error: OperationalError (OperationalError) (1048, "Column 'instance_uuid' cannot be null") 'UPDATE instance_extra SET updated_at=%s, instance_uuid=%s WHERE instance_extra.id = %s' (datetime.datetime(2014, 12, 25, 11, 11, 36, 186194), None, 13L)**
19:11:36.105 20544 TRACE oslo.messaging.rpc.dispatcher [u'Traceback (most recent call last):\n', u'
File "/usr/lib/python2.7/dist-packages/nova/conductor/manager.py", line 400, in _object_dispatch\n return getattr(target, method)(context, *args, **kwargs)\n', u'
File "/usr/lib/python2.7/dist-packages/nova/objects/base.py", line 204, in wrapper\n return fn(self, ctxt, *args, **kwargs)\n', u'
File "/usr/lib/python2.7/dist-packages/nova/objects/instance.py", line 500, in save\n columns_to_join=_expected_cols(expected_attrs))\n', u'
File "/usr/lib/python2.7/dist-packages/nova/db/api.py", line 746, in instance_update_and_get_original\n columns_to_join=columns_to_join)\n', u'
File "/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/api.py", line 143, in wrapper\n return f(*args, **kwargs)\n', u'
File "/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/api.py", line 2289, in instance_update_and_get_original\n columns_to_join=columns_to_join)\n', u'
File "/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/api.py", line 2380, in _instance_update\n session.add(instance_ref)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 470, in __exit__\n self.rollback()\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__\n compat.reraise(exc_type, exc_value, exc_tb)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 467, in __exit__\n self.commit()\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 377, in commit\n self._prepare_impl()\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 357, in _prepare_impl\n self.session.flush()\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1919, in flush\n self._flush(objects)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2037, in _flush\n transaction.rollback(_capture_exception=True)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__\n compat.reraise(exc_type, exc_value, exc_tb)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2001, in _flush\n flush_context.execute()\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 372, in execute\n rec.execute(self)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 526, in execute\n uow\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 60, in save_obj\n mapper, table, update)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 518, in _emit_update_statements\n execute(statement, params)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 729, in execute\n return meth(self, multiparams, params)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/sql/elements.py", line 321, in _execute_on_connection\n return connection._execute_clauseelement(self, multiparams, params)\n', u' File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 826, in _execute_clauseelement\n compiled_sql, distilled_params\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 958, in _execute_context\n context)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1156, in _handle_dbapi_exception\n util.raise_from_cause(newraise, exc_info)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/util/compat.py", line 199, in raise_from_cause\n reraise(type(exception), exception, tb=exc_tb)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 951, in _execute_context\n context)\n', u'
File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 436, in do_execute\n cursor.execute(statement, parameters)\n', u'
File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 174, in execute\n self.errorhandler(self, exc, value)\n', u'
File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler\n raise errorclass, errorvalue\n', u'OperationalError: (OperationalError) (1048, "Column \'instance_uuid\' cannot be null") \'UPDATE instance_extra SET updated_at=%s, instance_uuid=%s WHERE instance_extra.id = %s\' (datetime.datetime(2014, 12, 25, 11, 11, 36, 186194), None, 13L)\n'].
在对此代码行进行注释后，操作可以向前移动，但在调用位置的其他instance.save（）中也会发生类似的问题。
谢谢。