CN105025104A - A cloud desktop scheduling method and system - Google Patents
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Abstract
Description
技术领域technical field
本发明涉及云桌面系统中桌面应用技术，尤其涉及一种云桌面调度方法和系统。The invention relates to desktop application technology in a cloud desktop system, in particular to a cloud desktop scheduling method and system.
背景技术Background technique
随着云计算技术的不断成熟，云计算逐步成为业界的发展热点，云桌面纷纷投入到政府、高校、商业等等多个领域进行使用。在云桌面系统中，如何保证云桌面的高效使用，保证用户的高可用连接是整个云桌面系统中的重要组成部分。但是在云桌面的迁移过程中涉及到桌面系统的内存、存储以及用户的关联等操作，如何正确处理桌面的动态迁移，使用户能够快速高效的使用桌面是云桌面系统中的重要研究内容之一。With the continuous maturity of cloud computing technology, cloud computing has gradually become a development hotspot in the industry, and cloud desktops have been put into use in many fields such as government, universities, and commerce. In the cloud desktop system, how to ensure the efficient use of the cloud desktop and ensure the high-availability connection of users is an important part of the entire cloud desktop system. However, the migration process of the cloud desktop involves operations such as the memory, storage, and user association of the desktop system. How to correctly handle the dynamic migration of the desktop so that users can use the desktop quickly and efficiently is one of the important research contents in the cloud desktop system. .
发明内容Contents of the invention
为了解决上述问题，本发明提出了一种云桌面调度方法和系统，能够在物理主机出现故障时，及时对云桌面进行动态迁移，保证云桌面的高可用性。In order to solve the above problems, the present invention proposes a cloud desktop scheduling method and system, which can dynamically migrate the cloud desktop in time when a physical host fails, so as to ensure high availability of the cloud desktop.
为了达到上述目的，本发明提出了一种云桌面调度方法，多个云桌面分别运行在多个物理主机上，该方法包括：In order to achieve the above object, the present invention proposes a cloud desktop scheduling method, in which multiple cloud desktops run on multiple physical hosts respectively, the method comprising:
实时监测多个物理主机和多个云桌面的运行状态和性能。Real-time monitoring of the running status and performance of multiple physical hosts and multiple cloud desktops.
当监测到物理主机出现故障时，根据预先设置的调度策略将运行在出现故障的物理主机上的云桌面迁移到未出现故障的物理主机上。When a failure of a physical host is detected, the cloud desktop running on the failed physical host will be migrated to a non-faulty physical host according to the preset scheduling strategy.
其中，调度策略是根据监测到的多个物理主机和多个云桌面的性能预先设置的。Wherein, the scheduling strategy is preset according to the monitored performance of multiple physical hosts and multiple cloud desktops.
优选地，该方法还包括：Preferably, the method also includes:
当监测到物理主机的负载量大于或等于预设的负载阈值时，根据预先设置的调度策略将运行在负载量大于或等于预设的负载阈值的物理主机上的云桌面迁移到负载量小于预设的负载阈值的物理主机上。When it is detected that the load of the physical host is greater than or equal to the preset load threshold, the cloud desktop running on the physical host with the load greater than or equal to the preset load threshold will be migrated to the cloud desktop with the load less than the preset load according to the preset scheduling policy. Set the load threshold on the physical host.
优选地，该方法还包括：Preferably, the method also includes:
当运行在出现故障的物理主机上的云桌面被迁移到未出现故障的物理主机上，或者当运行在负载量大于或等于预设的负载阈值的物理主机上的云桌面被迁移到负载量小于预设的负载阈值的物理主机上时，保持被迁移的云桌面的可用性和数据不丢失。When a cloud desktop running on a failed physical host is migrated to a non-faulty physical host, or when a cloud desktop running on a physical host with a load greater than or equal to a preset load threshold is migrated to a load less than When the preset load threshold is on the physical host, the availability and data loss of the migrated cloud desktop will be maintained.
优选地，保持被迁移的云桌面的可用性和数据不丢失包括：Preferably, maintaining the availability and data loss of the migrated cloud desktop includes:
当被迁移的云桌面运行的物理主机出现故障时，获取出现故障的物理主机在出现故障前保存的被迁移的云桌面的运行数据，根据该运行数据，以及调度策略中与出现故障的物理主机相对应的未出现故障的物理主机上预先存储的被迁移的云桌面的相关数据，在未出现故障的物理主机上继续运行被迁移的云桌面；或者，When the physical host on which the migrated cloud desktop is running fails, obtain the running data of the migrated cloud desktop saved by the failed physical host before the failure, and according to the running data, and the scheduling policy and the failed physical host The relevant data of the migrated cloud desktop that is pre-stored on the corresponding non-faulty physical host continues to run the migrated cloud desktop on the non-failure physical host; or,
当被迁移的云桌面运行的物理主机的负载量大于或等于预设的负载阈值时，获取负载量大于或等于预设的负载阈值的物理主机上运行的将要被迁移的云桌面的运行数据，根据该运行数据，以及调度策略中与负载量大于或等于预设的负载阈值的物理主机相对应的负载量小于预设的负载阈值的物理主机上预先存储的被迁移的云桌面的相关数据，在负载量小于预设的负载阈值的物理主机上继续运行被迁移的云桌面。When the load of the physical host on which the migrated cloud desktop runs is greater than or equal to the preset load threshold, obtain the running data of the cloud desktop to be migrated running on the physical host whose load is greater than or equal to the preset load threshold, According to the operation data, and the related data of the migrated cloud desktops stored in advance on the physical host whose load is greater than or equal to the preset load threshold corresponding to the load of the scheduling policy is less than the preset load threshold, Continue to run the migrated cloud desktop on the physical host whose load is less than the preset load threshold.
为了达到上述目的，本发明还提出了一种云桌面调度系统，多个云桌面分别运行在多个物理主机上，该系统包括：监测模块和迁移模块。In order to achieve the above object, the present invention also proposes a cloud desktop scheduling system, in which multiple cloud desktops run on multiple physical hosts respectively, and the system includes: a monitoring module and a migration module.
监测模块，用于实时监测多个物理主机和多个云桌面的运行状态和性能。The monitoring module is used to monitor the running status and performance of multiple physical hosts and multiple cloud desktops in real time.
迁移模块，用于当监测到物理主机出现故障时，根据预先设置的调度策略将运行在出现故障的物理主机上的云桌面迁移到未出现故障的物理主机上。The migration module is used for migrating the cloud desktop running on the failed physical host to a non-faulty physical host according to a preset scheduling policy when a failure of the physical host is detected.
其中，调度策略是根据监测到的多个物理主机和多个云桌面的性能预先设置的。Wherein, the scheduling strategy is preset according to the monitored performance of multiple physical hosts and multiple cloud desktops.
优选地，迁移模块还用于：Preferably, the migration module is also used to:
当监测到物理主机的负载量大于或等于预设的负载阈值时，根据预先设置的调度策略将运行在负载量大于或等于预设的负载阈值的物理主机上的云桌面迁移到负载量小于预设的负载阈值的物理主机上。When it is detected that the load of the physical host is greater than or equal to the preset load threshold, the cloud desktop running on the physical host with the load greater than or equal to the preset load threshold will be migrated to the cloud desktop with the load less than the preset load according to the preset scheduling policy. Set the load threshold on the physical host.
优选地，该系统还包括：保持模块。Preferably, the system further comprises: a holding module.
当运行在出现故障的物理主机上的云桌面被迁移到未出现故障的物理主机上，或者当运行在负载量大于或等于预设的负载阈值的物理主机上的云桌面被迁移到负载量小于预设的负载阈值的物理主机上时，保持被迁移的云桌面的可用性和数据不丢失。When a cloud desktop running on a failed physical host is migrated to a non-faulty physical host, or when a cloud desktop running on a physical host with a load greater than or equal to a preset load threshold is migrated to a load less than When the preset load threshold is on the physical host, the availability and data loss of the migrated cloud desktop will be maintained.
优选地，保持模块保持被迁移的云桌面的可用性和数据不丢失包括：Preferably, keeping the availability and data loss of the migrated cloud desktop by the keeping module includes:
当被迁移的云桌面运行的物理主机出现故障时，获取出现故障的物理主机在出现故障前保存的被迁移的云桌面的运行数据，根据该运行数据，以及调度策略中与出现故障的物理主机相对应的未出现故障的物理主机上预先存储的被迁移的云桌面的相关数据，在未出现故障的物理主机上继续运行被迁移的云桌面；或者，When the physical host on which the migrated cloud desktop is running fails, obtain the running data of the migrated cloud desktop saved by the failed physical host before the failure, and according to the running data, and the scheduling policy and the failed physical host The relevant data of the migrated cloud desktop that is pre-stored on the corresponding non-faulty physical host continues to run the migrated cloud desktop on the non-failure physical host; or,
当被迁移的云桌面运行的物理主机的负载量大于或等于预设的负载阈值时，获取负载量大于或等于预设的负载阈值的物理主机上运行的将要被迁移的云桌面的运行数据，根据该运行数据，以及调度策略中与负载量大于或等于预设的负载阈值的物理主机相对应的负载量小于预设的负载阈值的物理主机上预先存储的被迁移的云桌面的相关数据，在负载量小于预设的负载阈值的物理主机上继续运行被迁移的云桌面。When the load of the physical host on which the migrated cloud desktop runs is greater than or equal to the preset load threshold, obtain the running data of the cloud desktop to be migrated running on the physical host whose load is greater than or equal to the preset load threshold, According to the operation data, and the related data of the migrated cloud desktops stored in advance on the physical host whose load is greater than or equal to the preset load threshold corresponding to the load of the scheduling policy is less than the preset load threshold, Continue to run the migrated cloud desktop on the physical host whose load is less than the preset load threshold.
与现有技术相比，本发明包括：实时监测多个物理主机和多个云桌面的运行状态和性能。当监测到物理主机出现故障时，根据预先设置的调度策略将运行在出现故障的物理主机上的云桌面迁移到未出现故障的物理主机上。其中，调度策略是根据监测到的多个物理主机和多个云桌面的运行性能预先设置的。通过本发明的方案，能够在物理主机出现故障时，及时对云桌面进行动态迁移，保证云桌面的高可用性。Compared with the prior art, the present invention includes: real-time monitoring of the operating status and performance of multiple physical hosts and multiple cloud desktops. When a failure of a physical host is detected, the cloud desktop running on the failed physical host will be migrated to a non-faulty physical host according to the preset scheduling strategy. Wherein, the scheduling strategy is preset according to the monitored operating performance of multiple physical hosts and multiple cloud desktops. Through the solution of the present invention, when a physical host fails, the cloud desktop can be dynamically migrated in time to ensure high availability of the cloud desktop.
附图说明Description of drawings
下面对本发明实施例中的附图进行说明，实施例中的附图是用于对本发明的进一步理解，与说明书一起用于解释本发明，并不构成对本发明保护范围的限制。The accompanying drawings in the embodiments of the present invention are described below. The accompanying drawings in the embodiments are used for further understanding of the present invention and are used together with the description to explain the present invention, and do not constitute a limitation to the protection scope of the present invention.
图1为本发明的云桌面调度方法流程图；Fig. 1 is a flow chart of the cloud desktop scheduling method of the present invention;
图2为本发明的云桌面调度系统组成框图。FIG. 2 is a block diagram of the cloud desktop scheduling system of the present invention.
具体实施方式Detailed ways
为了便于本领域技术人员的理解，下面结合附图对本发明作进一步的描述，并不能用来限制本发明的保护范围。In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings, which cannot be used to limit the protection scope of the present invention.
本发明的发明构思是：检测到发生故障的物理主机，自动的将正在运行的云桌面从故障物理机迁移到其他未出现故障的物理机上。在物理主机资源负载过高时，也可以将运行在该物理主机上的云桌面迁移到负载较低的物理主机上，实现云桌面的高可用。The inventive concept of the present invention is to detect a failed physical host, and automatically migrate the running cloud desktop from the failed physical machine to other non-faulty physical machines. When the resource load of the physical host is too high, the cloud desktop running on the physical host can also be migrated to a physical host with a lower load to achieve high availability of the cloud desktop.
为了达到上述目的，本发明提出了一种云桌面调度方法，多个云桌面分别运行在多个物理主机上，如图1所示，该方法包括：In order to achieve the above object, the present invention proposes a cloud desktop scheduling method, in which multiple cloud desktops run on multiple physical hosts respectively, as shown in Figure 1, the method includes:
S101、实时监测多个物理主机和多个云桌面的运行状态和性能。S101. Monitor the running status and performance of multiple physical hosts and multiple cloud desktops in real time.
在本发明实施例中，为了能及时发现云桌面系统出现的故障，对云桌面系统中的多个物理主机以及分别运行在多个物理主机上的多个云桌面实施实时监测策略。在本发明方案中，并不限制采用的监测方法和监测装置，而且，我们可以对多个物理主机进行统一监测，也可以对每个物理主机分别监测。In the embodiment of the present invention, in order to detect failures in the cloud desktop system in time, a real-time monitoring strategy is implemented for multiple physical hosts in the cloud desktop system and multiple cloud desktops respectively running on multiple physical hosts. In the scheme of the present invention, the monitoring method and monitoring device used are not limited, and we can monitor multiple physical hosts in a unified manner, or monitor each physical host separately.
S102、当监测到物理主机出现故障时，根据预先设置的调度策略将运行在出现故障的物理主机上的云桌面迁移到未出现故障的物理主机上。其中，调度策略是根据监测到的多个物理主机和多个云桌面的性能预先设置的。S102. When a failure of the physical host is detected, migrate the cloud desktop running on the failed physical host to a non-faulty physical host according to a preset scheduling policy. Wherein, the scheduling strategy is preset according to the monitored performance of multiple physical hosts and multiple cloud desktops.
在本发明实施例中，基于对云桌面系统中的多个物理主机以及分别运行在多个物理主机上的多个云桌面实施的实时监测策略，我们会根据各个物理主机以及各个云桌面的监测数据对各个物理主机以及各个云桌面的运行状态和性能做出评估，并根据该评估结果预先制定一个调度策略，该调度策略中至少包括当某一个物理主机出现故障时，可以调度到哪个或哪几个物理主机上，并预先在这些物理主机上存储可能出现故障的物理主机上运行的云桌面的相关数据。In the embodiment of the present invention, based on the real-time monitoring strategy implemented for multiple physical hosts in the cloud desktop system and multiple cloud desktops running on multiple physical hosts, we will monitor each physical host and each cloud desktop The data evaluates the running status and performance of each physical host and each cloud desktop, and pre-establishes a scheduling strategy based on the evaluation results. The scheduling strategy includes at least which one or which can be scheduled when a certain physical host fails. Several physical hosts, and pre-store on these physical hosts the relevant data of the cloud desktop running on the physical host that may fail.
优选地，该方法还包括：Preferably, the method also includes:
当监测到物理主机的负载量大于或等于预设的负载阈值时，根据预先设置的调度策略将运行在负载量大于或等于预设的负载阈值的物理主机上的云桌面迁移到负载量小于预设的负载阈值的物理主机上。When it is detected that the load of the physical host is greater than or equal to the preset load threshold, the cloud desktop running on the physical host with the load greater than or equal to the preset load threshold will be migrated to the cloud desktop with the load less than the preset load according to the preset scheduling policy. Set the load threshold on the physical host.
在本发明实施例中，对于每一个物理主机会预选设置一个负载阈值，当物理主机上的负载量大于或等于这个负载阈值时，该物理主机出现故障的几率就会大幅度增加，因此，为了减轻物理主机的负载，避免物理主机频繁出现故障，我们会将负载量大于或等于负载阈值的物理主机上的云桌面迁移到负载量小于负载阈值的物理主机上，当然，该迁移操作也是基于预先制定的调度策略进行的，这里调度策略的制定如上所述，在此不再赘述。另外，本发明方案中的负载阈值对于不同的物理主机来说，可以相同，也可以不同，具体根据每个物理主机的自身性能而定。In the embodiment of the present invention, a load threshold is pre-selected for each physical host. When the load on the physical host is greater than or equal to the load threshold, the probability of failure of the physical host will increase significantly. Therefore, for To reduce the load on the physical host and avoid frequent failures of the physical host, we will migrate the cloud desktops on the physical host whose load is greater than or equal to the load threshold to the physical host whose load is less than the load threshold. The formulation of the scheduling strategy is carried out, and the formulation of the scheduling strategy is as described above, and will not be repeated here. In addition, the load thresholds in the solution of the present invention may be the same or different for different physical hosts, depending on the performance of each physical host.
优选地，该方法还包括：Preferably, the method also includes:
当运行在出现故障的物理主机上的云桌面被迁移到未出现故障的物理主机上，或者当运行在负载量大于或等于预设的负载阈值的物理主机上的云桌面被迁移到负载量小于预设的负载阈值的物理主机上时，保持被迁移的云桌面的可用性和数据不丢失。When a cloud desktop running on a failed physical host is migrated to a non-faulty physical host, or when a cloud desktop running on a physical host with a load greater than or equal to a preset load threshold is migrated to a load less than When the preset load threshold is on the physical host, the availability and data loss of the migrated cloud desktop will be maintained.
在本发明实施例中，为了进一步实现云桌面的高可用性，在云桌面的迁移过程中必须保持云桌面的可用性和数据不丢失，即，实现热迁移。具体实现方案如下：In the embodiment of the present invention, in order to further realize the high availability of the cloud desktop, it is necessary to maintain the availability of the cloud desktop and not lose data during the migration process of the cloud desktop, that is, implement hot migration. The specific implementation plan is as follows:
优选地，保持被迁移的云桌面的可用性和数据不丢失包括：Preferably, maintaining the availability and data loss of the migrated cloud desktop includes:
当被迁移的云桌面运行的物理主机出现故障时，获取出现故障的物理主机在出现故障前保存的被迁移的云桌面的运行数据，根据该运行数据，以及调度策略中与出现故障的物理主机相对应的未出现故障的物理主机上预先存储的被迁移的云桌面的相关数据，在未出现故障的物理主机上继续运行被迁移的云桌面；或者，When the physical host on which the migrated cloud desktop is running fails, obtain the running data of the migrated cloud desktop saved by the failed physical host before the failure, and according to the running data, and the scheduling policy and the failed physical host The relevant data of the migrated cloud desktop that is pre-stored on the corresponding non-faulty physical host continues to run the migrated cloud desktop on the non-failure physical host; or,
当被迁移的云桌面运行的物理主机的负载量大于或等于预设的负载阈值时，获取负载量大于或等于预设的负载阈值的物理主机上运行的将要被迁移的云桌面的运行数据，根据该运行数据，以及调度策略中与负载量大于或等于预设的负载阈值的物理主机相对应的负载量小于预设的负载阈值的物理主机上预先存储的被迁移的云桌面的相关数据，在负载量小于预设的负载阈值的物理主机上继续运行被迁移的云桌面。When the load of the physical host on which the migrated cloud desktop runs is greater than or equal to the preset load threshold, obtain the running data of the cloud desktop to be migrated running on the physical host whose load is greater than or equal to the preset load threshold, According to the operation data, and the related data of the migrated cloud desktops stored in advance on the physical host whose load is greater than or equal to the preset load threshold corresponding to the load of the scheduling policy is less than the preset load threshold, Continue to run the migrated cloud desktop on the physical host whose load is less than the preset load threshold.
为了达到上述目的，本发明还提出了一种云桌面调度系统01，多个云桌面分别运行在多个物理主机上，如图2所示，该系统包括：监测模块02和迁移模块03。In order to achieve the above purpose, the present invention also proposes a cloud desktop scheduling system 01, in which multiple cloud desktops run on multiple physical hosts respectively, as shown in FIG. 2 , the system includes: a monitoring module 02 and a migration module 03.
监测模块02，用于实时监测多个物理主机和多个云桌面的运行状态和性能。The monitoring module 02 is used to monitor the operating status and performance of multiple physical hosts and multiple cloud desktops in real time.
迁移模块03，用于当监测到物理主机出现故障时，根据预先设置的调度策略将运行在出现故障的物理主机上的云桌面迁移到未出现故障的物理主机上。The migration module 03 is used for migrating the cloud desktop running on the failed physical host to a non-faulty physical host according to a preset scheduling policy when a failure of the physical host is detected.
其中，调度策略是根据监测到的多个物理主机和多个云桌面的性能预先设置的。Wherein, the scheduling strategy is preset according to the monitored performance of multiple physical hosts and multiple cloud desktops.
优选地，迁移模块03还用于：Preferably, migration module 03 is also used for:
当监测到物理主机的负载量大于或等于预设的负载阈值时，根据预先设置的调度策略将运行在负载量大于或等于预设的负载阈值的物理主机上的云桌面迁移到负载量小于预设的负载阈值的物理主机上。When it is detected that the load of the physical host is greater than or equal to the preset load threshold, the cloud desktop running on the physical host with the load greater than or equal to the preset load threshold will be migrated to the cloud desktop with the load less than the preset load according to the preset scheduling policy. Set the load threshold on the physical host.
优选地，该系统还包括：保持模块04。Preferably, the system further includes: a holding module 04 .
当运行在出现故障的物理主机上的云桌面被迁移到未出现故障的物理主机上，或者当运行在负载量大于或等于预设的负载阈值的物理主机上的云桌面被迁移到负载量小于预设的负载阈值的物理主机上时，保持被迁移的云桌面的可用性和数据不丢失。When a cloud desktop running on a failed physical host is migrated to a non-faulty physical host, or when a cloud desktop running on a physical host with a load greater than or equal to a preset load threshold is migrated to a load less than When the preset load threshold is on the physical host, the availability and data loss of the migrated cloud desktop will be maintained.
优选地，保持模块04保持被迁移的云桌面的可用性和数据不丢失包括：Preferably, maintaining module 04 to maintain availability and data loss of the migrated cloud desktop includes:
当被迁移的云桌面运行的物理主机出现故障时，获取出现故障的物理主机在出现故障前保存的被迁移的云桌面的运行数据，根据该运行数据，以及调度策略中与出现故障的物理主机相对应的未出现故障的物理主机上预先存储的被迁移的云桌面的相关数据，在未出现故障的物理主机上继续运行被迁移的云桌面；或者，When the physical host on which the migrated cloud desktop is running fails, obtain the running data of the migrated cloud desktop saved by the failed physical host before the failure, and according to the running data, and the scheduling policy and the failed physical host The relevant data of the migrated cloud desktop that is pre-stored on the corresponding non-faulty physical host continues to run the migrated cloud desktop on the non-failure physical host; or,
当被迁移的云桌面运行的物理主机的负载量大于或等于预设的负载阈值时，获取负载量大于或等于预设的负载阈值的物理主机上运行的将要被迁移的云桌面的运行数据，根据该运行数据，以及调度策略中与负载量大于或等于预设的负载阈值的物理主机相对应的负载量小于预设的负载阈值的物理主机上预先存储的被迁移的云桌面的相关数据，在负载量小于预设的负载阈值的物理主机上继续运行被迁移的云桌面。When the load of the physical host on which the migrated cloud desktop runs is greater than or equal to the preset load threshold, obtain the running data of the cloud desktop to be migrated running on the physical host whose load is greater than or equal to the preset load threshold, According to the operation data, and the related data of the migrated cloud desktops stored in advance on the physical host whose load is greater than or equal to the preset load threshold corresponding to the load of the scheduling policy is less than the preset load threshold, Continue to run the migrated cloud desktop on the physical host whose load is less than the preset load threshold.
与现有技术相比，本发明包括：实时监测多个物理主机和多个云桌面的运行状态和性能。当监测到物理主机出现故障时，根据预先设置的调度策略将运行在出现故障的物理主机上的云桌面迁移到未出现故障的物理主机上。其中，调度策略是根据监测到的多个物理主机和多个云桌面的运行性能预先设置的。通过本发明的方案，能够在物理主机出现故障时，及时对云桌面进行动态迁移，保证云桌面的高可用性。Compared with the prior art, the present invention includes: real-time monitoring of the operating status and performance of multiple physical hosts and multiple cloud desktops. When a failure of a physical host is detected, the cloud desktop running on the failed physical host will be migrated to a non-faulty physical host according to the preset scheduling strategy. Wherein, the scheduling strategy is preset according to the monitored operating performance of multiple physical hosts and multiple cloud desktops. Through the solution of the present invention, when a physical host fails, the cloud desktop can be dynamically migrated in time to ensure high availability of the cloud desktop.
需要说明的是，以上所述的实施例仅是为了便于本领域的技术人员理解而已，并不用于限制本发明的保护范围，在不脱离本发明的发明构思的前提下，本领域技术人员对本发明所做出的任何显而易见的替换和改进等均在本发明的保护范围之内。It should be noted that the above-described embodiments are only for the convenience of those skilled in the art to understand, and are not intended to limit the protection scope of the present invention. Any obvious replacements and improvements made by the invention are within the protection scope of the present invention.
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