CN109766462B - Image file reading method, device and system in power transmission line monitoring system - Google Patents
Image file reading method, device and system in power transmission line monitoring system Download PDFInfo
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Abstract
The application discloses an image file reading method in a power transmission line monitoring system, which comprises the following steps: a storage node in the power transmission line distributed system receives an image reading request message from a server; the storage node comprises a storage hard disk and a cache system; the storage hard disk is used for storing image files, and the cache system is used for caching record information of the read image files; the cache system comprises a first storage area and a second storage area, wherein the first storage area is used for correspondingly storing the identification of the image file and the time stamp of the read image file, and the second storage area is used for correspondingly storing the content of the read image file in the storage hard disk and the corresponding image file identification; and the storage node returns the corresponding image file to the server according to the image reading request message, and newly builds the recording information of the corresponding image file in the second storage area or updates the recording information of the corresponding image file. The image data reading method and device can improve the reading speed of the image data.
Description
Technical Field
The present disclosure relates to the field of data reading, and in particular, to a method, an apparatus, and a system for reading an image file in a power transmission line monitoring system.
Background
Most of the current transmission line monitoring systems adopt still images to judge the line condition, take pictures of the sites of possible or occurred abnormal phenomena and store the image data of the sites.
And after the image data are transmitted to the monitoring background, the image data are stored in the storage node, and operation and maintenance personnel check the field images of the power transmission lines through the monitoring platform.
The operation and maintenance personnel need to directly acquire image data from the storage node, however, the pictures shot by the monitoring system usually occupy a large storage space, and the operation and maintenance personnel need to directly acquire the image data from the storage node, so that the disk access pressure of the storage node is increased, and the reading speed of the image data is reduced.
Disclosure of Invention
In order to solve the above problem, in a first aspect, the present application provides an image file reading method in a power transmission line monitoring system, including:
a storage node in a distributed system of a power transmission line receives an image reading request message from a server, wherein the image reading request message comprises: a target storage node identifier and an identifier of an image file;
the storage node comprises a storage hard disk and a cache system; the storage hard disk is used for storing image files, and the cache system is used for caching and reading the recording information of the image files; the cache system comprises a first storage area and a second storage area, wherein the first storage area is used for correspondingly storing the identification of the image file and the time stamp for reading the image file, and the second storage area is used for correspondingly storing the content of the read image file in the storage hard disk and the corresponding image file identification;
and the storage node returns the corresponding image file to the server according to the image reading request message, and newly builds the recording information of the corresponding image file in the second storage area or updates the recording information of the corresponding image file.
In one example, the storage node determines whether the image file identifier is stored in the cache system according to the image file identifier in the image reading request message;
and under the condition that the image file identification is stored in the cache system, the cache system returns the corresponding image file content in the second storage area to the server according to the corresponding relation between the image file identification and the image file content in the second storage area, and updates the time stamp for reading the image file in the first storage area.
In one example, the storage node determines whether the image file identifier is stored in the cache system according to the image file identifier in the image reading request message;
under the condition that the image file identification is not stored in the cache system, the storage node inquires image file content corresponding to the image file identification in the storage hard disk and returns the image file content to the server; and correspondingly storing the image file identification and the time stamp for reading the image file into the first storage area, and correspondingly storing the image file identification and the image file content into the second storage area.
In one example, the storage node determines, according to a preset time and a timestamp in the first storage area, an image file with a storage time exceeding the preset time, and deletes image file related information in the first storage area and the second storage area, where the storage time exceeding the preset time, where the image file related information includes an image file identifier, image file content, and a timestamp for reading the image file.
In one example, when the storage node detects that the number of the image file identifications stored in the first storage area or the second storage area reaches a preset number,
and deleting the image file related information firstly stored in the cache system according to the time stamp of the read image file in the first storage area and the time sequence, wherein the image related information comprises an image file identifier, image file content and the time stamp of the read image file.
In one example, the first storage area or the second storage area stores the number of readings of the corresponding image file;
when detecting that the number of the image file identifications stored in the first storage area or the second storage area reaches a preset number, the storage node deletes the relevant information of the image file which has the query times smaller than the preset number and is stored in the cache system for the longest time according to a time sequence, wherein the image relevant information comprises the image file identification, the image file content, the time stamp for reading the image file and the number of times for reading the image file.
In one example, the server receives an image file acquisition message from a terminal, the image file acquisition message including at least one of the following image file information: image file name, image file keyword and image file identification; the server determines a storage node identifier and an image file identifier corresponding to the image file according to the at least one item of image file information; and the server correspondingly stores the image file information and the storage node identification.
In one example, the server obtains the number of image file identifiers stored in a cache system of each storage node in a plurality of storage nodes in the power transmission line distributed system; when the number of the image file identifications stored in the cache system exceeds a first number threshold, determining a target storage node; the target storage node is a storage node of which the number of the image file identifications stored in the cache system does not exceed a second number threshold;
and the server stores the partial image file information in the cache system of which the number of the image file identifications exceeds a first number threshold value into the cache system of the target storage node.
In a second aspect, an embodiment of the present application provides an image file reading apparatus in a power transmission line monitoring system, including: the device comprises a receiving unit, a storage unit, a cache unit and a data processing unit;
the receiving unit is used for receiving an image reading request message from a server by one storage node in the power transmission line distributed system, and the image reading request message comprises: storing node identification and identification of the image file;
the storage unit is used for storing image files;
the cache unit is used for caching and reading the record information of the image file; the cache unit comprises a first storage area and a second storage area, wherein the first storage area is used for correspondingly storing the identification of the image file and the time stamp for reading the image file, and the second storage area is used for correspondingly storing the content of the read image file in the storage hard disk and the corresponding image file identification;
and the data processing unit returns the corresponding image file to the server according to the image reading request message, and newly builds the recording information of the corresponding image file in the second storage area or updates the recording information of the corresponding image file.
In a third aspect, an embodiment of the present application provides an image file reading system in a power transmission line monitoring system, including: a server and at least one storage node according to the first aspect.
The image file reading method in the power transmission line monitoring system has the following beneficial effects that:
1. storing partial image files by using a cache system, and enabling a part of the image files to be directly called from the cache system when a request is received, so that the read-write pressure of a storage hard disk is reduced;
2. the cache system is divided into two parts to store the image file related information, and the content in the first storage area is continuously sequenced, so that the resources occupied by the storage nodes when the image file related information is sorted and stored are reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of an image file reading method in a power transmission line monitoring system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an image file reading device in a power transmission line monitoring system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an image file reading system in a power transmission line monitoring system according to an embodiment of the present application.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
The embodiment of the application discloses an image file reading method in a power transmission line monitoring system, which comprises the following steps as shown in figure 1:
In an embodiment of the present application, the image reading request message includes: an identification of the target storage node and an identification of the image file. The server first receives an image file acquisition message from the terminal, wherein the image file acquisition message comprises but is not limited to any one or more of the following image file information: image file name, image file keyword, image file identification. The server determines a target storage node identifier and an image file identifier corresponding to the image file according to the image file information; and the server correspondingly stores the image file information and the target storage node identification.
The storage node comprises a storage hard disk and a cache system; the storage hard disk is used for storing image files, and the cache system is used for caching record information of the read image files; the cache system comprises a first storage area and a second storage area, wherein the first storage area is used for storing the identification of the image file and the corresponding timestamp, such as the file name and the reading time, according to the time relationship of reading the image file in the storage hard disk. The second storage area is used for correspondingly storing and reading the content of the image files in the storage hard disk and the identification of the corresponding image files.
And 103, the storage node inquires the image file content corresponding to the image file identifier in the storage hard disk and returns the image file content to the server.
In the embodiment of the application, after the storage node verifies that the target storage node identifier is correct, the image file content corresponding to the image file identifier is returned to the server. And for the image files which are not in the cache system, the storage node reads the corresponding image files from the storage hard disk and returns the image files to the server.
And 104, correspondingly storing the image file identification and the time stamp for reading the image file into the first storage area by the storage node, and correspondingly storing the image file identification and the image file content into the second storage area by the storage node.
Since the storage capacity of the cache system is limited, when the storage capacity of the cache system reaches a maximum value, a part of files in the cache needs to be deleted so as to continue to store other files. Therefore, in the embodiment of the present application, the time stamps of the read image files are recorded, and when the storage node detects that the number of the image file identifiers stored in the first storage area or the second storage area reaches the preset number, the image file related information stored in the cache system first is deleted according to the time stamps of the read image files in the first storage area in a time sequence, where the image related information includes, but is not limited to, the image file identifiers, the image file contents, and the time stamps of the read image files. And then, the storage node correspondingly stores the image file identifier and the time stamp for reading the image file into the first storage area, and correspondingly stores the image file identifier and the image file content into the second storage area.
However, some image files are important and need to be called frequently. For these files, it should be possible to leave them in the cache system to reduce the read-write pressure on the hard disk. Therefore, in another embodiment of the present application, when detecting that the number of the image file identifiers stored in the first storage area or the second storage area reaches the preset number, the storage node deletes, according to the time sequence, the relevant information of the image file of which the query number is less than the preset number and which is stored in the cache system for the longest time, so as to ensure that the important image file is stored in the cache as much as possible.
For example, there are three files A, B, C in the cache system, the storage time of file a and file B is two days, the storage time of file C is 1 day, and the query times of the three files are 20 times, 10 times and 9 times, respectively. Although the storage time of the file A is the same as that of the file B, the query frequency of the file A is more, so the importance is higher. In order to leave file a in the caching system as much as possible, file B needs to be deleted.
Only relying on the time sequence and the query times to clean up the image files in the cache system can lead to the fact that some image files with a large number of historical query times but a small number of current access times are stored on the cache system, and therefore file reading efficiency is reduced. For example, there are two files A, B in the cache system, the storage time of file a and file B are both two days, and the query times of the two files are 20 times and 10 times respectively. However, 20 queries for file a all occur on the first day that file a is stored in the cache system, while 9 queries for file B occur on the second day that file B is stored in the cache system, which indicates that file a is less important than file B with respect to the current time, but according to the method in the above embodiment, the storage node still deletes file B.
In order to solve the above problem, in another embodiment of the present application, the storage node may also determine, according to the preset time and the timestamp in the first storage area, the image file whose storage time exceeds the preset time, and delete the information related to the image file whose storage time exceeds the preset time in the first storage area and the second storage area, so that the storage node deletes the file with the large number of historical accesses, so as to ensure timeliness of the data in the cache system.
And 105, the storage node returns the corresponding image file content in the second storage area to the server according to the corresponding relation between the image file identification and the image file content in the second storage area, and updates the time stamp of the read image file in the first storage area.
In the embodiment of the application, the time stamp of reading the image file is recorded, so that the storage node can delete the image file related information of which the storage time in the first storage area and the second storage area exceeds the preset time conveniently.
In addition, when the service is busy, the number of the image files in the cache system cannot meet the service requirement only by adjusting the number of the image files by the storage node, and at this time, the server is required to transfer the information related to the image files on the storage node to other storage nodes. Therefore, in the embodiment of the application, the server acquires the number of the image file identifications stored in the cache system of each storage node in the plurality of storage nodes in the power transmission line distributed system; when the number of the image file identifications stored in the cache system exceeds a first number threshold, determining a target storage node; the target storage node is a storage node of which the number of the image file identifications stored in the cache system does not exceed a second number threshold; and the server stores the partial image file information in the cache system of which the number of the image file identifications exceeds a first number threshold value into the cache system of the target storage node.
Specifically, the servers correspond to a storage node a, a storage node B, and a storage node C, and the number of files stored in the cache system of the three storage nodes, that is, the number of image file identifiers, is 11, 6, and 1, respectively. Wherein the first threshold is 10 and the second threshold is 5. At this time, the number of the image files in the storage node A is larger than a first threshold value, the server determines a target storage node of the storage node C, and stores the information of at most 4 image files in the cache system of the storage node A into the cache system of the storage node C, so that the number of the image files in the cache system of the storage node A is not more than 10, and the number of the image files in the cache system of the storage node C is not more than 5.
As shown in fig. 2, an image file reading apparatus in a power transmission line monitoring system according to an embodiment of the present application includes: a receiving unit 201, a storage unit 202, a buffer unit 203 and a data processing unit 204.
The receiving unit 201 is configured to receive an image reading request message from a server at a storage node in a distributed system of a power transmission line, where the image reading request message includes: storing node identification and identification of the image file;
the storage unit 202 is used for storing image files;
the cache unit 203 is used for caching the record information of the read image file; the cache unit comprises a first storage area and a second storage area, the first storage area is used for storing the identifier of the image file and the corresponding timestamp according to the time relationship of reading the image file in the storage hard disk, and the second storage area is used for correspondingly storing the content of the image file in the storage hard disk and the identifier of the corresponding image file;
the data processing unit 204 returns the corresponding image file to the server according to the image reading request message, and creates or updates a record of the read image file in the second storage area.
As shown in fig. 3, an image file reading system in a power transmission line monitoring system provided in an embodiment of the present application includes: a server 301 and at least one storage node 302 as described in the above embodiments.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (3)
1. An image file reading method in a power transmission line monitoring system is characterized by comprising the following steps:
the method comprises the following steps that a server receives an image file acquisition message from a terminal, wherein the image file acquisition message comprises at least one of the following image file information: image file name, image file keyword and image file identification; the server determines a storage node identifier and an image file identifier corresponding to the image file according to the at least one item of image file information; the server correspondingly stores image file information and storage node identification;
a storage node in a distributed system of a power transmission line receives an image reading request message from a server, wherein the image reading request message comprises: a target storage node identifier and an identifier of an image file;
the storage node comprises a storage hard disk and a cache system; the storage hard disk is used for storing image files, and the cache system is used for caching and reading the recording information of the image files; the cache system comprises a first storage area and a second storage area, wherein the first storage area is used for correspondingly storing the identifier of the image file and the time stamp for reading the image file, and the second storage area is used for correspondingly storing the content of the read image file in the storage hard disk and the identifier of the corresponding image file;
the storage node returns a corresponding image file to the server according to the image reading request message, and creates new record information of the corresponding image file in the second storage area or updates the record information of the corresponding image file, which specifically includes:
the storage node determines whether the image file identification is stored in the cache system according to the image file identification in the image reading request message;
under the condition that the image file identification is stored in the cache system, the cache system returns the corresponding image file content in the second storage area to the server according to the corresponding relation between the image file identification and the image file content in the second storage area, and updates the time stamp for reading the image file in the first storage area;
under the condition that the image file identification is not stored in the cache system, the storage node inquires image file content corresponding to the image file identification in the storage hard disk and returns the image file content to the server; correspondingly storing the image file identification and the time stamp for reading the image file into the first storage area, and correspondingly storing the image file identification and the image file content into the second storage area;
the first storage area or the second storage area stores the reading times of the corresponding image file;
when detecting that the number of the image file identifications stored in the first storage area or the second storage area reaches a preset number, the storage node deletes the related information of the image file, the query frequency of which is less than the preset frequency and the longest time of which is stored in the cache system, according to a time sequence, wherein the related information of the image includes the image file identification, the image file content, a timestamp for reading the image file and the frequency for reading the image file;
or the server acquires the number of the image file identifications stored in the cache system of each storage node in a plurality of storage nodes in the power transmission line distributed system; when the number of the image file identifications stored in the cache system exceeds a first number threshold, determining a target storage node; the target storage node is a storage node of which the number of the image file identifications stored in the cache system does not exceed a second number threshold; the server stores the partial image file information in the cache system of which the number of the image file identifications exceeds a first number threshold value into the cache system of the target storage node;
or, the storage node determines, according to preset time and a timestamp in the first storage area, an image file whose storage time exceeds the preset time, and deletes image file related information whose storage time exceeds the preset time in the first storage area and the second storage area, where the image related information includes an image file identifier, image file content, and a timestamp for reading the image file;
or when the storage node detects that the number of the image file identifications stored in the first storage area or the second storage area reaches a preset number, deleting the image file related information stored in the cache system according to the time stamp of reading the image file in the first storage area and the time sequence, wherein the image file related information comprises the image file identification, the image file content and the time stamp of reading the image file.
2. An image file reading device in a power transmission line monitoring system is characterized by comprising: the device comprises a receiving unit, a storage unit, a cache unit and a data processing unit;
the receiving unit is used for receiving an image reading request message from a server by one storage node in the power transmission line distributed system, and the image reading request message comprises: a target storage node identifier and an identifier of an image file;
the storage unit is used for storing image files;
the cache unit is used for caching and reading the record information of the image file; the cache unit comprises a first storage area and a second storage area, the first storage area is used for correspondingly storing the identification of the image file and the time stamp for reading the image file, and the second storage area is used for correspondingly storing the content of the read image file in the storage unit and the corresponding image file identification;
the data processing unit returns a corresponding image file to the server according to the image reading request message, and creates new record information of the corresponding image file in the second storage area or updates the record information of the corresponding image file, which specifically includes:
the data processing unit determines whether the image file identification is stored in the cache unit according to the image file identification in the image reading request message;
under the condition that the image file identification is stored in the cache unit, the cache unit returns the corresponding image file content in the second storage area to the server according to the corresponding relation between the image file identification and the image file content in the second storage area, and updates the time stamp for reading the image file in the first storage area;
the first storage area or the second storage area stores the reading times of the corresponding image file;
when detecting that the number of the image file identifications stored in the first storage area or the second storage area reaches a preset number, the data processing unit deletes the relevant information of the image file with the query times smaller than the preset number and the longest time stored in the cache unit according to a time sequence, wherein the image relevant information comprises the image file identification, the image file content, a time stamp for reading the image file and the number of times for reading the image file;
the data processing unit is used for determining the image files with the storage time exceeding the preset time according to the preset time and the time stamps in the first storage area, and deleting the image file related information with the storage time exceeding the preset time in the first storage area and the second storage area, wherein the image file related information comprises image file identification, image file content and time stamps for reading the image files;
the data processing unit is further configured to delete the image file related information stored in the cache unit in time sequence according to the timestamp of reading the image file in the first storage area when detecting that the number of the image file identifiers stored in the first storage area or the second storage area reaches a preset number, where the image file related information includes the image file identifier, the image file content, and the timestamp of reading the image file.
3. An image file reading system in a power transmission line monitoring system is characterized by comprising: a server and an image file reading device in the power transmission line monitoring system of claim 2.
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