CN117896371A - Cloud storage quota speed limit downloading method and device - Google Patents

Abstract

The present invention discloses a cloud storage quota speed-limited download method and device, including: receiving a download request, and performing data reading and writing according to the download request; obtaining a preset data volume threshold and a transmission rate threshold, and calculating a download time threshold according to the data volume threshold and the transmission rate threshold; obtaining the current data reading and writing volume in real time, and judging whether the current data reading and writing volume reaches the data volume threshold, if so, obtaining the data reading and writing duration; judging whether the data reading and writing duration is less than the download time threshold, if so, stopping the data reading and writing until the download time threshold is reached and then performing the data reading and writing again; if not, adjusting the current data reading and writing volume to the data volume threshold and then performing the data reading and writing again. Since the transmission rate threshold is a fixed value, the transmission rate that each user can use is fixed, thereby avoiding the problem of resource preemption between different users; at the same time, adjusting the speed of the current data reading and writing in real time, improving the user experience while avoiding users occupying extra resources.

Description

A cloud storage quota speed-limited download method and device

Technical Field

The present invention relates to the technical field of flow control, and in particular to a cloud storage quota speed-limited downloading method and device.

Background technique

With the continuous development of cloud computing, users can store and manage digital files on the Internet. Through cloud disks, users can upload personal or corporate files to remote servers, and then access and share these files anytime and anywhere through the Internet. Cloud disks provide a convenient, secure and reliable file storage and management solution. Users can access, edit and download their own files through computers, mobile phones or other devices.

However, if there is no quota and bandwidth limit for users to download, users may download a large amount of resources, resulting in a waste of resources. Especially for popular resources, it is easy to be downloaded in large quantities, and other users may not be able to obtain the resources in time. At the same time, some users may abuse resources and occupy bandwidth by downloading a large amount, causing other users to be unable to access or download resources normally, reducing the fairness of the service. If a large number of users perform high-frequency download operations in the same time period, it may cause network congestion and affect the network experience of other users. Unrestricted downloading may provide convenience for malicious users, who can exploit this vulnerability to carry out large-scale malicious downloads, thereby causing harm to the system or abusing resources. In addition, unlimited downloading will bring higher costs to cloud storage providers, such as increased traffic bandwidth fees and pressure on server operation and maintenance. Therefore, limiting users' download speed and number of downloads can balance the allocation of resources and maintain the stability and fairness of the network.

In the prior art, static bandwidth allocation is usually adopted: unified speed limit is performed through the Nginx gateway. Nginx is a high-performance HTTP and reverse proxy web server, which provides flow and speed limit function configuration to achieve speed limit for user requests. However, it cannot target specific users. The speed limit solution it provides is a single request. Users can transfer files at the same time by initiating multiple requests, which means that there is still a problem of network resource occupation. If you need to modify the speed limit configuration, you need to manually modify the nginx configuration file. However, there are risks in modifying the nginx.conf configuration file. If nginx is deployed in a cluster, you need to modify the configuration file of each nginx server, which is time-consuming and labor-intensive.

Therefore, the current system has no effective mechanism to limit the bandwidth usage of users, or only limits the speed through a single terminal, resulting in some users occupying too much bandwidth resources during high traffic periods, thereby affecting the service quality of other users. And this phenomenon may cause service instability or even interruption, seriously damaging the user experience. At the same time, limiting the number of download tasks for a single user through the client cannot effectively limit the number of download tasks for all clients. That is, a user can start multiple clients at the same time and perform a large number of download tasks, bypassing the restrictions of the download task management module and the bandwidth management module, and consuming a large amount of system resources. This may not only cause the performance of the system to deteriorate, but may also have an adverse impact on the use of other users.

Summary of the invention

The technical problem to be solved by the present invention is to provide a cloud storage quota speed-limited download method and device to solve the problem of random bandwidth preemption in the existing cloud storage system.

In order to solve the above technical problems, the technical solution adopted by the present invention is:

A cloud storage quota speed-limited download method, comprising:

Receive a download request, and read and write data according to the download request;

Obtaining a preset data volume threshold and a transmission rate threshold, and calculating a download time threshold based on the data volume threshold and the transmission rate threshold;

Obtain the current data read/write volume in real time, and determine whether the current data read/write volume reaches the data volume threshold, and if so, obtain the data read/write duration;

Determine whether the data reading and writing duration is less than the download time threshold, and if so, stop data reading and writing until the download time threshold is reached and then execute data reading and writing again;

If not, the current data read/write amount is adjusted to the data amount threshold and then data read/write is performed again.

In order to solve the above technical problems, another technical solution adopted by the present invention is:

A cloud storage quota speed-limited download device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented:

Receive a download request, and read and write data according to the download request;

Obtaining a preset data volume threshold and a transmission rate threshold, and calculating a download time threshold based on the data volume threshold and the transmission rate threshold;

Obtain the current data read/write volume in real time, and determine whether the current data read/write volume reaches the data volume threshold, and if so, obtain the data read/write duration;

Determine whether the data reading and writing duration is less than the download time threshold, and if so, stop data reading and writing until the download time threshold is reached and then execute data reading and writing again;

If not, the current data read/write amount is adjusted to the data amount threshold and then data read/write is performed again.

The beneficial effects of the present invention are as follows: by obtaining a preset data volume threshold and a transmission rate threshold after receiving a download request, and calculating a download time threshold based on the data volume threshold and the transmission rate threshold, since the transmission rate threshold is a constant, that is, the transmission rate that each user can use is fixed, the problem of resource preemption between different users is avoided; at the same time, by comparing the current data reading and writing time with the corresponding download time threshold, when the data reading and writing speed is too fast, the data reading and writing is stopped, which extends the time of the next data reading and writing, and when the data reading and writing speed is too slow, the current data reading and writing amount is adjusted to the data volume threshold, which speeds up the time of the next data reading and writing, thereby realizing real-time adjustment of the current data reading and writing speed, improving the user experience while avoiding users from occupying additional resources.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flowchart of a method for downloading with a cloud storage quota and speed limit according to an embodiment of the present invention;

FIG2 is a system flow chart of a cloud storage quota speed-limited download method according to an embodiment of the present invention;

FIG3 is a schematic diagram of the structure of a cloud storage quota speed-limited download device according to an embodiment of the present invention.

Detailed ways

In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

Referring to FIG. 1 , a method for downloading with a cloud storage quota and speed limit includes:

Receive a download request, and read and write data according to the download request;

Obtaining a preset data volume threshold and a transmission rate threshold, and calculating a download time threshold based on the data volume threshold and the transmission rate threshold;

Obtain the current data read/write volume in real time, and determine whether the current data read/write volume reaches the data volume threshold, and if so, obtain the data read/write duration;

Determine whether the data reading and writing duration is less than the download time threshold, and if so, stop data reading and writing until the download time threshold is reached and then execute data reading and writing again;

If not, the current data read/write amount is adjusted to the data amount threshold and then data read/write is performed again.

From the above description, it can be seen that the beneficial effects of the present invention are: by obtaining a preset data volume threshold and a transmission rate threshold after receiving a download request, and calculating a download time threshold based on the data volume threshold and the transmission rate threshold, since the transmission rate threshold is a constant, that is, the transmission rate that each user can use is fixed, thereby avoiding the problem of resource preemption between different users; at the same time, by comparing the current data reading and writing time with the corresponding download time threshold, when the data reading and writing speed is too fast, the data reading and writing is stopped, which extends the time for the next data reading and writing, and when the data reading and writing speed is too slow, the current data reading and writing amount is adjusted to the data volume threshold, which speeds up the time for the next data reading and writing, thereby realizing real-time adjustment of the current data reading and writing speed, improving the user experience while avoiding users occupying additional resources.

Further, the download time threshold calculated according to the data volume threshold and the transmission rate threshold includes:

Obtain the number of tasks included in the download request;

Obtaining an average download rate of the tasks according to the number of tasks and the transmission rate threshold;

The download time threshold of each task is obtained according to the task average download rate and the data volume threshold.

From the above description, it can be seen that the average download rate of the tasks is obtained according to the number of tasks included in the download request and the transmission rate threshold, and each task can be processed simultaneously by allocating a corresponding maximum download rate to each task.

Furthermore, it also includes:

Determine in real time whether the number of tasks is reduced, and if so, update the number of tasks;

The download time threshold is updated according to the updated task quantity.

From the above description, it can be seen that when the number of tasks is reduced due to task download completion, task cancellation, and task interruption, the current number of tasks is obtained in real time and the corresponding download time threshold of each task is updated. The maximum download rate of each task can be adjusted in real time according to the updated download time threshold, thereby improving task processing efficiency.

Further, the receiving a download request and reading and writing data according to the download request further includes:

Get the number of tokens in the current token bucket;

It is determined whether the number of tokens required for the download request is greater than the number of tokens. If so, it is determined whether the download request meets the token overdraft condition. If so, the download request is executed.

From the above description, it can be seen that when receiving a download request, if the number of tokens required for the current download request is greater than the number of tokens in the token bucket, the download request that meets the token overdraft conditions will be executed by overdrafting tokens, which can effectively solve the problem of current limiting caused by insufficient number of tokens and improve the efficiency of the system in processing requests.

Furthermore, the determining whether the download request meets the token overdraft condition further includes:

If not, the download request is executed until the number of tokens and the required number of tokens are equal to the number of tokens; or the download request is executed until the download request meets the token overdraft condition.

From the above description, it can be seen that when a download request does not currently meet the token overdraft condition, the download request can be executed by waiting for the token quantity to be restored or meet the token overdraft condition, thereby improving the efficiency of the system in processing requests.

Another embodiment of the present invention provides a cloud storage quota speed-limited download device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

Receive a download request, and read and write data according to the download request;

Obtaining a preset data volume threshold and a transmission rate threshold, and calculating a download time threshold based on the data volume threshold and the transmission rate threshold;

Obtain the current data read/write volume in real time, and determine whether the current data read/write volume reaches the data volume threshold, and if so, obtain the data read/write duration;

Determine whether the data reading and writing duration is less than the download time threshold, and if so, stop data reading and writing until the download time threshold is reached and then execute data reading and writing again;

If not, the current data read/write amount is adjusted to the data amount threshold and then data read/write is performed again.

From the above description, it can be seen that by obtaining the preset data volume threshold and transmission rate threshold after receiving the download request, and calculating the download time threshold based on the data volume threshold and the transmission rate threshold, since the transmission rate threshold is a constant, that is, the transmission rate that each user can use is fixed, the problem of resource preemption between different users is avoided; at the same time, by comparing the current data reading and writing time with the corresponding download time threshold, when the data reading and writing speed is too fast, the data reading and writing is stopped, which extends the time of the next data reading and writing, and when the data reading and writing speed is too slow, the current data reading and writing amount is adjusted to the data volume threshold, which speeds up the time of the next data reading and writing, thereby realizing real-time adjustment of the current data reading and writing speed, improving the user experience while avoiding users occupying extra resources.

Further, the download time threshold calculated according to the data volume threshold and the transmission rate threshold includes:

Obtain the number of tasks included in the download request;

Obtaining an average download rate of the tasks according to the number of tasks and the transmission rate threshold;

The download time threshold of each task is obtained according to the task average download rate and the data volume threshold.

From the above description, it can be seen that the average download rate of the tasks is obtained according to the number of tasks included in the download request and the transmission rate threshold, and each task can be processed simultaneously by allocating a corresponding maximum download rate to each task.

Furthermore, it also includes:

Determine in real time whether the number of tasks is reduced, and if so, update the number of tasks;

The download time threshold is updated according to the updated task quantity.

From the above description, it can be seen that when the number of tasks is reduced due to task download completion, task cancellation, and task interruption, the current number of tasks is obtained in real time and the corresponding download time threshold of each task is updated. The maximum download rate of each task can be adjusted in real time according to the updated download time threshold, thereby improving task processing efficiency.

Further, the receiving a download request and reading and writing data according to the download request further includes:

Get the number of tokens in the current token bucket;

It is determined whether the number of tokens required for the download request is greater than the number of tokens. If so, it is determined whether the download request meets the token overdraft condition. If so, the download request is executed.

From the above description, it can be seen that when receiving a download request, if the number of tokens required for the current download request is greater than the number of tokens in the token bucket, the download request that meets the token overdraft conditions will be executed by overdrafting tokens, which can effectively solve the problem of current limiting caused by insufficient number of tokens and improve the efficiency of the system in processing requests.

Furthermore, the determining whether the download request meets the token overdraft condition further includes:

If not, the download request is executed until the number of tokens and the required number of tokens are equal to the number of tokens; or the download request is executed until the download request meets the token overdraft condition.

From the above description, it can be seen that when a download request does not currently meet the token overdraft condition, the download request can be executed by waiting for the token quantity to be restored or meet the token overdraft condition, thereby improving the efficiency of the system in processing requests.

The cloud storage quota speed-limited download method and device provided by the present invention can be applied to scenarios of resource allocation such as cloud storage, to achieve effective control of the number of user download tasks, and to prevent excessive occupation of system resources. The following is an explanation through specific implementation methods:

Embodiment 1

Referring to FIG. 1 and FIG. 2 , a cloud storage quota speed-limited download method includes:

S1. Receive a download request, and read and write data according to the download request;

S2. Obtain a preset data volume threshold and a transmission rate threshold, and calculate a download time threshold based on the data volume threshold and the transmission rate threshold; for example, define a data block (chunk) in bytes, the size of which is the data volume threshold, and define a maximum rate maxRate allowed by the user in KB/s, which is the transmission rate threshold; wherein the download time threshold is adjusted according to the number of tasks included in the download request, and the specific steps are as follows:

S21, obtaining the number of tasks included in the download request;

S22. Obtain an average download rate of the tasks according to the number of tasks and the transmission rate threshold; if the number of tasks is represented by n and the average download rate of the tasks is represented by bytesWillBeSentOrReceive-chunkSize, then bytesWillBeSentOrReceive-chunkSize=maxRate/n;

S23, according to the task average download rate and data volume threshold, obtain the download time threshold of each task; specifically: according to the data block defined in the above steps and the task average download rate, the time required to pass a byte stream of the size of a data block can be obtained, that is, the download time threshold is obtained, which is represented by timeCostPerChunk; at the same time, it is necessary to determine in real time whether the number of tasks is reduced or increased, if so, update the number of tasks, such as when a task is downloaded, canceled or interrupted, the current number of tasks is updated to n-1, and the download time threshold is updated according to the updated number of tasks; similarly, when the number of tasks increases, the number of tasks and the download time threshold are updated;

S3, real-time acquisition of the current data read/write volume, and determination of whether the current data read/write volume reaches the data volume threshold, if so, acquisition of the data read/write duration; such as when reading/writing bytes during task execution, acquisition of the bytes that have been read/written as the current data read/write volume (bytesWillBeSentOrReceive); when the current data read/write volume reaches the size of one of the above data blocks, the time consumed during the inspection is used to obtain the data read/write duration (nowNanoTime-lastPieceSentOrReceiveTick);

S4, determining whether the data read and write time is less than the download time threshold, if so, executing S5; if not, executing S6;

S5, stop data reading and writing until the download time threshold is reached and then execute data reading and writing again; that is, when the data reading and writing duration is less than the download time threshold, it means that the time consumed during the period is less than the download time threshold, indicating that the current transmission rate has exceeded the task average download rate, therefore, the task is put to sleep by stopping data reading and writing to limit the flow;

S6. If not, then adjust the current data reading and writing amount to the data amount threshold and then execute data reading and writing again; that is, when the data reading and writing duration is greater than the download time threshold, it indicates that the current transmission rate has not reached the task average download rate, then set bytesWillBeSentOrReceive = bytesWillBeSentOrReceive-chunkSize (that is, current data reading and writing amount = task average download rate); at the same time, when the task is dormant, the rate of the next data reading and writing is also adjusted in the above manner, and the current data reading and writing rate is monitored in real time during the subsequent data reading and writing process, and adjusted.

Embodiment 2

The difference between this embodiment and the first embodiment is that: the way of executing the download request is controlled by adjusting the allocation mode of the token; in the prior art, the token bucket usually generates tokens at a stable speed, such as a token bucket that generates r tokens per second; if each request arrives, it needs to consume n tokens, and the number of tokens remaining in the token bucket is m; when the next request arrives at time t ₀ , if m<n, the request needs to wait (nm)/r seconds before it can be processed; and when m>n, the request will be directly released. Assume that 6 requests come at the same time at time t ₁ when the number of tokens in the token bucket is m=5*n+1; at this time, 5 of the 6 requests will be directly released regardless of the order, and the remaining request needs to wait (n-1)/r seconds before it can be processed, which causes burst tolerance. Therefore, only when the number of tokens m in the token bucket is consumed to a certain level, that is, m∈[0,n), can future requests be limited, and the traffic state at this moment is defined as "average traffic level". If there are no remaining tokens in the token bucket, that is, m=0, each request that consumes n tokens will need n/r seconds to wait for token production, that is, the "average traffic level" is: r/n, and the unit is: QPS requests/second; thus, the token production efficiency affects the waiting time of the request, and then affects the QPS of the traffic.

However, for a token bucket with r=1, at a certain moment, there are only 5 tokens in the token bucket, and the request that arrives at this time is a request that consumes 100 tokens, then the request needs to wait 95 seconds before it can be executed. Even if the current system is in an idle state, the system cannot process the request, resulting in the system facing the dilemma of concurrent execution with subsequent requests after 95 seconds, which reduces the efficiency of the system in processing requests; in this embodiment, requests are allowed to "overdraw" when applying for tokens. No matter how many tokens are currently remaining, the request will be released, and the time to wait for the token bucket to generate enough tokens will be borne by subsequent requests.

In view of the above problems, this embodiment provides a token allocation method, specifically:

When executing step S1 in the first embodiment, the method further includes:

S11, obtain the number of tokens in the current token bucket;

S12, determining whether the number of tokens required for the download request is greater than the number of tokens, if so, executing S13; if not, executing S14;

S13. Determine whether the download request meets the token overdraft condition. If so, execute the download request; that is, when the token overdraft condition is met, the request is allowed to "overdraw" when applying for the token, and the request will be released regardless of how many tokens are left in the current token bucket; wherein, the number of tokens allowed to be overdrawn and the number of consecutive overdrafts can be set, and when the download request meets the number of tokens allowed to be overdrawn and the number of consecutive overdrafts, the overdraft operation is performed; and the time waiting for the token bucket to generate enough tokens is borne by subsequent requests; wherein, for a request, assuming that the number of tokens overdrawn by the previous request is c, the waiting time of the current request satisfies the formula: WaitTime=c/r; at the same time, when the token bucket is in an idle state, tokens can be replenished through the resync method.

S14. Execute the download request until the required number of tokens is equal to the number of tokens; or execute the download request until the download request meets the token overdraft condition; at the same time, record the user's operation behavior during the user download process; so that the user's operation behavior can be queried through the background record later, to prevent the record from being tampered with and avoid data leakage.

Embodiment 3

Referring to FIG. 3 , a cloud storage quota speed-limited download device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented:

S1. Receive a download request and read and write data according to the download request. Specifically:

S11, obtain the number of tokens in the current token bucket;

S12, determining whether the number of tokens required for the download request is greater than the number of tokens, if so, executing S13; if not, executing S14;

S13, determining whether the download request meets the token overdraft condition, and if so, executing the download request;

S14. Execute the download request until the number of tokens and the required number of tokens are equal to the number of tokens; or execute the download request until the download request meets the token overdraft condition.

S2. Obtain a preset data volume threshold and a transmission rate threshold, and calculate a download time threshold according to the data volume threshold and the transmission rate threshold. Specifically:

S21, obtaining the number of tasks included in the download request;

S22, obtaining an average download rate of the tasks according to the number of tasks and the transmission rate threshold;

S23. Obtain the download time threshold of each task according to the average download rate of the task and the data volume threshold; at the same time, determine in real time whether the number of tasks decreases or increases, and if so, update the number of tasks; and update the download time threshold according to the updated number of tasks.

S3, obtaining the current data read/write volume in real time, and determining whether the current data read/write volume reaches the data volume threshold, and if so, obtaining the data read/write duration;

S4, determining whether the data read and write time is less than the download time threshold, if so, executing S5; if not, executing S6;

S5, stop reading and writing data until the download time threshold is reached and then execute data reading and writing again;

S6, adjusting the current data reading and writing amount to the data amount threshold and then performing data reading and writing again.

In summary, the present invention provides a cloud storage quota speed-limited download method and device, which obtains a preset data volume threshold and a transmission rate threshold after receiving a download request, and calculates a download time threshold based on the data volume threshold and the transmission rate threshold. Since the transmission rate threshold is a fixed value, that is, the transmission rate that each user can use is fixed, the download rate of a single user is effectively controlled, which can prevent excessive occupation of system resources, avoid the problem of resource preemption between different users and the system crash due to resource exhaustion, thereby improving the stability and reliability of the system; at the same time, by comparing the current data reading and writing time with the corresponding download time threshold, when the data reading and writing speed is too fast, the data reading and writing is stopped, which prolongs the time of the next data reading and writing, and when the data reading and writing speed is too slow, the current data reading and writing amount is adjusted to the data volume threshold, which speeds up the time of the next data reading and writing, thereby realizing real-time adjustment of the current data reading and writing speed, improving the user experience while avoiding users occupying extra resources.

The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims (10)

1. The cloud storage quota speed limit downloading method is characterized by comprising the following steps of:

receiving a downloading request, and reading and writing data according to the downloading request;

acquiring a preset data volume threshold and a transmission rate threshold, and calculating a downloading time threshold according to the data volume threshold and the transmission rate threshold;

acquiring current data read-write quantity in real time, judging whether the current data read-write quantity reaches the data quantity threshold value, and if so, acquiring data read-write time length;

judging whether the data read-write time length is smaller than the downloading time threshold value, if so, stopping data read-write until the downloading time threshold value is reached, and executing data read-write again;

if not, the current data read-write quantity is adjusted to the data quantity threshold value, and then the data read-write is executed again.

2. The cloud storage quota speed limit downloading method according to claim 1, wherein the calculating the downloading time threshold according to the data amount threshold and the transmission rate threshold comprises:

acquiring the number of tasks contained in the downloading request;

obtaining the average download rate of the tasks according to the number of the tasks and the transmission rate threshold;

and obtaining the downloading time threshold of each task according to the average downloading rate of the tasks and the data quantity threshold.

3. The cloud storage quota speed limit downloading method as in claim 2, further comprising:

judging whether the number of the tasks is reduced in real time, if so, updating the number of the tasks;

and updating the downloading time threshold according to the updated task number.

4. The cloud storage quota speed limit downloading method according to claim 1, wherein the receiving a downloading request and performing data reading and writing according to the downloading request further comprises:

obtaining the number of tokens of a current token bucket;

judging whether the number of tokens required by the downloading request is larger than the number of tokens, if yes, judging whether the downloading request meets the token overdraft condition, and if yes, executing the downloading request.

5. The cloud storage quota speed limit downloading method as in claim 4, wherein said determining whether said download request meets a token overdraft condition further comprises:

if not, executing the downloading request until the number of tokens is equal to the number of tokens; or executing the downloading request until the downloading request meets the token overdraft condition.

6. The cloud storage quota speed limit downloading device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, and is characterized in that the processor realizes the following steps when executing the computer program:

receiving a downloading request, and reading and writing data according to the downloading request;

acquiring a preset data volume threshold and a transmission rate threshold, and calculating a downloading time threshold according to the data volume threshold and the transmission rate threshold;

acquiring current data read-write quantity in real time, judging whether the current data read-write quantity reaches the data quantity threshold value, and if so, acquiring data read-write time length;

judging whether the data read-write time length is smaller than the downloading time threshold value, if so, stopping data read-write until the downloading time threshold value is reached, and executing data read-write again;

if not, the current data read-write quantity is adjusted to the data quantity threshold value, and then the data read-write is executed again.

7. The cloud storage quota speed limit downloading apparatus as in claim 6, wherein said calculating a download time threshold from said data volume threshold and said transmission rate threshold comprises:

acquiring the number of tasks contained in the downloading request;

obtaining the average download rate of the tasks according to the number of the tasks and the transmission rate threshold;

and obtaining the downloading time threshold of each task according to the average downloading rate of the tasks and the data quantity threshold.

8. The cloud storage quota speed limit downloading apparatus as in claim 7, further comprising:

judging whether the number of the tasks is reduced in real time, if so, updating the number of the tasks;

and updating the downloading time threshold according to the updated task number.

9. The cloud storage quota speed limit downloading apparatus as in claim 6, wherein said receiving a download request and reading and writing data according to said download request further comprises:

obtaining the number of tokens of a current token bucket;

judging whether the number of tokens required by the downloading request is larger than the number of tokens, if yes, judging whether the downloading request meets the token overdraft condition, and if yes, executing the downloading request.

10. The cloud storage quota speed limit downloading apparatus as in claim 9, wherein said determining whether said download request meets a token overdraft condition further comprises:

if not, executing the downloading request until the number of tokens is equal to the number of tokens; or executing the downloading request until the downloading request meets the token overdraft condition.