CN111858669A - Method and device for second-level caching of data - Google Patents
Method and device for second-level caching of data Download PDFInfo
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- CN111858669A CN111858669A CN202010638560.5A CN202010638560A CN111858669A CN 111858669 A CN111858669 A CN 111858669A CN 202010638560 A CN202010638560 A CN 202010638560A CN 111858669 A CN111858669 A CN 111858669A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/24—Querying
- G06F16/245—Query processing
- G06F16/2455—Query execution
- G06F16/24552—Database cache management
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/0802—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches
- G06F12/0893—Caches characterised by their organisation or structure
- G06F12/0897—Caches characterised by their organisation or structure with two or more cache hierarchy levels
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/23—Updating
- G06F16/2365—Ensuring data consistency and integrity
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/54—Interprogram communication
- G06F9/546—Message passing systems or structures, e.g. queues
Abstract
The invention provides a method and a device for caching data at the second level, wherein the method comprises the following steps: creating a message sender and a message subscriber; a message subscriber receives a message which is published to a preset channel by a sender; updating the local cache according to the message; if the local cache is abnormal, performing second-level cache updating; wherein the local cache exception comprises: there is no cache or cache miss locally. The invention can subscribe the appointed channel to the newly added node/service, and then judges whether the local cache condition needs to be updated by the second level cache according to the subscribed information, thus ensuring the data consistency of each service. By adding the local cache and the Redis cache, the query times of the hot spot data are reduced, the response time of the service is reduced, the dependence on a database or an interface is reduced, the throughput is improved, and therefore the purpose of improving the service performance is achieved.
Description
Technical Field
The present invention relates to the field of computers, and in particular, to a method and an apparatus for secondary caching of data.
Background
In the prior art, when a large amount of communication and a large amount of data requests exist between a user side and a server side, the conditions that the request speed is slow, the response speed of the server side is slow, and the user experience is seriously influenced occur. At this time, a set of message caching scheme is needed, which can reduce the number of times of querying hot spot data, reduce the response time of the service and further improve the service method.
Disclosure of Invention
In order to solve the problems of huge workload and low efficiency of data caching in the prior art, the invention provides a method and a device for secondary caching of data.
In a first aspect, the present invention provides a method for caching data at two levels, including:
creating a message sender and a message subscriber;
a message subscriber receives a message which is published to a preset channel by a sender;
updating the local cache according to the message;
if the local cache is abnormal, performing second-level cache updating; wherein the local cache exception comprises: there is no cache or cache miss locally.
Further, if the local cache is abnormal, performing second-level cache update includes:
if the local cache is abnormal, adding synchronous lock synchronous data;
inquiring whether cache data exist in Redis;
and if so, updating local cache data by using the cache data in the current Redis, and releasing the synchronous lock.
Further, querying whether cached data exists in Redis further comprises:
if not, inquiring whether cache data exist in the database;
and if so, updating the data in the Redis and the local cache data by using the data in the database, and releasing the synchronous lock.
Further, querying the database for the presence of cached data further comprises:
And if the data does not exist, setting the local cache data as a default value, updating the data in the Redis, and releasing the synchronous lock.
Further, the method further comprises:
setting preset time for a local cache;
and when the data updating time exceeds the preset time, acquiring the cache data in the Redis as the current local cache data.
In a second aspect, the present invention provides an apparatus for caching data at two levels, the apparatus comprising:
the creating module is used for creating a message sender and a message subscriber;
the sending module is used for receiving the message which is published to the preset channel by the sender by the message subscriber;
the updating module is used for updating the local cache according to the message;
the second-level cache module is used for performing second-level cache if the local cache is abnormal; wherein the local cache exception comprises: there is no cache or cache miss locally.
Further, the second level cache module comprises:
the synchronous lock unit is used for increasing synchronous lock synchronous data if the local cache is abnormal;
querying a Redis cache data unit for querying whether cache data exists in Redis;
and the local cache data updating unit is used for updating the local cache data by using the cache data in the current Redis if the local cache data exists, and releasing the synchronization lock.
Further, querying the Redis cache data unit further comprises:
the query database unit is used for querying whether the cache data exist in the database or not if the cache data do not exist in the database;
and the update Redis and local cache data unit is used for updating the data in the Redis and the local cache data by using the data in the database if the update Redis and the local cache data unit exist, and releasing the synchronization lock.
In a third aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of the method for caching data of the second level provided in the first aspect when executing the program.
In a fourth aspect, the present invention provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of data level two caching provided by the first aspect.
The invention can subscribe the appointed channel to the newly added node/service, and then judges whether the local cache condition needs to be updated by the second level cache according to the subscribed information, thus ensuring the data consistency of each service. By adding the local cache and the Redis cache, the query times of the hot spot data are reduced, the response time of the service is reduced, the dependence on a database or an interface is reduced, the throughput is improved, and therefore the purpose of improving the service performance is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for caching data in two levels according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of data query according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of data update according to an embodiment of the present invention;
fig. 4 is a block diagram of an apparatus for caching data in two levels according to an embodiment of the present invention;
fig. 5 is a block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to solve the above problems, an embodiment of the present invention provides a method for secondary caching of data, where when a large amount of communication and a large amount of data requests exist between existing server sides, a request speed is slow, a response speed of the server side is slow, and user experience is seriously affected, and as shown in fig. 1, the method includes:
Step S101, a message sender and a message subscriber are established;
step S102, a message subscriber receives a message which is published to a preset channel by a sender;
step S103, updating the local cache according to the message;
step S104, if the local cache is abnormal, performing second-level cache updating; wherein the local cache exception comprises: there is no cache or cache miss locally.
Specifically, a message publisher is created, a channel _ test is designated, a message subscriber is created, a channel _ test is subscribed, the message publisher publishes a new message, Redis data is updated, database data is updated, the subscriber asynchronously receives the message, and a local cache is updated. And if no cache exists locally or the cache fails, updating the second-level cache. The secondary cache reduces the query times of the hotspot data mainly by adding a local cache and a Redis cache. When the data is updated, the local cache and the redis cache of the current node are updated, and meanwhile, the publish/subscribe function of the redis is used for informing other nodes of enabling the local cache of each node to be invalid. The redis publish-subscribe (pub/sub) is a message communication mode: the sender (pub) sends a message to a specified channel, and the subscriber (sub) subscribes to the specified channel to receive the message. Asynchronous messages two communication applications may not need to wait on-line at the same time, and any party only needs to process own service respectively, for example, a sender does not need to wait for the response of a receiver after sending a message, and can process other tasks subsequently. That is to say, the sender and the receiver are independent from each other, the sender only manages sending, and the receiver only receives, without waiting for the response of the other party.
The invention can subscribe the appointed channel to the newly added node/service, and then judges whether the local cache condition needs to be updated by the second level cache according to the subscribed information, thus ensuring the data consistency of each service. By adding the local cache and the Redis cache, the query times of the hot spot data are reduced, the response time of the service is reduced, the dependence on a database or an interface is reduced, the throughput is improved, and therefore the purpose of improving the service performance is achieved.
Based on the content of the above embodiments, as an alternative embodiment: if the local cache is abnormal, the updating of the second-level cache comprises the following steps:
if the local cache is abnormal, adding synchronous lock synchronous data;
querying whether cached data exists in Redis: if the current cache data exists, updating the local cache data by using the cache data in the current Redis, and releasing the synchronous lock; if not, inquiring whether the database has cache data: if the data exists, updating the data in the Redis and the local cache data by using the data in the database, and releasing the synchronous lock; and if the data does not exist, setting the local cache data as a default value, updating the data in the Redis, and releasing the synchronous lock. See flowchart 2 for details.
The embodiment of the invention asynchronously updates the hot spot data among the services by utilizing a subscription/release mechanism of Redis, reduces the response time of data operation, reduces the coupling degree among the services, simultaneously ensures the data consistency of the services, reduces the query times of the hot spot data by increasing the local cache and the Redis cache, reduces the response time of the services, reduces the dependence of a database or an interface, and improves the throughput, thereby achieving the purpose of improving the service performance.
Based on the content of the above embodiments, as an alternative embodiment: the method further comprises the following steps:
setting preset time for a local cache;
and when the data updating time exceeds the preset time, acquiring the cache data in the Redis as the current local cache data.
Specifically, the local cache sets an expiration time; wherein the expiration time is a preset time; and the latest data can be acquired from the Redis after the data is expired under the condition that the data updating notification is not received due to a network or other reasons, so that the final consistency of the data among the services is ensured.
Based on the content of the above embodiments, as an alternative embodiment: referring to fig. 3, fig. 3 is a schematic flow chart of data update provided in the embodiment of the present invention, and the detailed steps are as follows:
Step 1: updating data;
step 2: updating database data;
and step 3: judging whether the current operation is successful, and if the operation is successful, executing the step 4; if the operation is unsuccessful, executing step 6;
and 4, step 4: updating a local cache and a redis cache;
and 5: notifying other nodes by using a redis subscription and release function, wherein the local cache is invalid;
step 6: and (6) ending.
According to another aspect of the present invention, an apparatus for providing a data level two cache according to an embodiment of the present invention is provided, referring to fig. 4, and fig. 4 is a block diagram of the apparatus for providing a data level two cache according to an embodiment of the present invention. The apparatus is used to complete the data level two cache provided in the embodiments of the present invention in the foregoing embodiments. Therefore, the description and definition in the method for caching the data in the second level provided by the embodiment of the present invention in the foregoing embodiments may be used for understanding the execution modules in the embodiments of the present invention.
The device includes:
a creating module 401, configured to create a message sender and a message subscriber;
a sending module 402, configured to receive, by a message subscriber, a message that is published to a preset channel by a sender;
an updating module 403, configured to update the local cache according to the message;
a second-level cache module 404, configured to perform second-level cache updating if the local cache is abnormal; wherein the local cache exception comprises: there is no cache or cache miss locally.
Specifically, the specific process of each module in the apparatus of this embodiment to implement its function may refer to the related description in the corresponding method embodiment, and is not described herein again.
In the embodiment of the invention, for the newly added nodes/services, the message subscriber only needs to subscribe the appointed channel, and then secondary cache updating is carried out according to the local cache condition, so that the query times of hot data are reduced by adding the local cache and the Redis cache after the data consistency of each service is ensured, the response time of the service is reduced, the dependence of a database or an interface is reduced, the throughput is improved, and the aim of improving the service performance is fulfilled.
Based on the content of the above embodiments, as an alternative embodiment: the second level cache module comprises:
the synchronous lock unit is used for increasing synchronous lock synchronous data if the local cache is abnormal;
querying a Redis cache data unit for querying whether cache data exists in Redis;
and the local cache data updating unit is used for updating the local cache data by using the cache data in the current Redis if the local cache data exists, and releasing the synchronization lock.
Specifically, the specific process of each module in the apparatus of this embodiment to implement its function may refer to the related description in the corresponding method embodiment, and is not described herein again.
Based on the content of the above embodiments, as an alternative embodiment: querying the Redis cache data unit further comprises:
the query database unit is used for querying whether the cache data exist in the database or not if the cache data do not exist in the database;
and the update Redis and local cache data unit is used for updating the data in the Redis and the local cache data by using the data in the database if the update Redis and the local cache data unit exist, and releasing the synchronization lock.
Specifically, the specific process of each module in the apparatus of this embodiment to implement its function may refer to the related description in the corresponding method embodiment, and is not described herein again.
Fig. 5 is a block diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 5, the electronic device includes: a processor 501, a memory 502, and a bus 503;
the processor 501 and the memory 502 respectively complete communication with each other through a bus 503; the processor 501 is configured to call the program instructions in the memory 502 to execute the method of the data level two caching provided by the above embodiments, for example, including: creating a message sender and a message subscriber; a message subscriber receives a message which is published to a preset channel by a sender; updating the local cache according to the message; if the local cache is abnormal, performing second-level cache updating; wherein the local cache exception comprises: there is no cache or cache miss locally.
Embodiments of the present invention provide a non-transitory computer readable storage medium having stored thereon a computer program that, when executed by a processor, performs the steps of a method for secondary caching of data. Examples include: creating a message sender and a message subscriber; a message subscriber receives a message which is published to a preset channel by a sender; updating the local cache according to the message; if the local cache is abnormal, performing second-level cache updating; wherein the local cache exception comprises: there is no cache or cache miss locally.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods of the various embodiments or some parts of the embodiments.
Finally, the principle and the implementation of the present invention are explained by applying the specific embodiments in the present invention, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method of secondary caching of data, the method comprising:
creating a message sender and a message subscriber;
a message subscriber receives a message which is published to a preset channel by a sender;
updating a local cache according to the message;
if the local cache is abnormal, performing second-level cache updating; wherein the local cache exception comprises: there is no cache or cache miss locally.
2. The method of claim 1, wherein if the local cache is abnormal, performing a second level cache update comprises:
if the local cache is abnormal, adding synchronous lock synchronous data;
inquiring whether cache data exist in Redis;
and if so, updating local cache data by using the cache data in the current Redis, and releasing the synchronous lock.
3. The method of claim 2, wherein querying whether cached data exists within Redis further comprises:
if not, inquiring whether cache data exist in the database;
and if so, updating the data in the Redis and the local cache data by using the data in the database, and releasing the synchronous lock.
4. The method of claim 3, wherein querying the database for the presence of cached data further comprises:
and if the data does not exist, setting the local cache data as a default value, updating the data in the Redis, and releasing the synchronous lock.
5. The method of claim 1, further comprising:
setting preset time for a local cache;
and when the data updating time exceeds the preset time, acquiring the cache data in the Redis as the current local cache data.
6. An apparatus for secondary caching of data, the apparatus comprising:
the creating module is used for creating a message sender and a message subscriber;
the sending module is used for receiving the message which is published to the preset channel by the sender by the message subscriber;
the updating module is used for updating the local cache according to the message;
the second-level cache module is used for updating the second-level cache if the local cache is abnormal; wherein the local cache exception comprises: there is no cache or cache miss locally.
7. The apparatus of claim 6, wherein the level two cache module comprises:
the synchronous lock unit is used for increasing synchronous lock synchronous data if the local cache is abnormal;
querying a Redis cache data unit for querying whether cache data exists in Redis;
and the local cache data updating unit is used for updating the local cache data by using the cache data in the current Redis if the local cache data exists, and releasing the synchronization lock.
8. The apparatus of claim 7, wherein querying the Redis cache data unit further comprises:
the query database unit is used for querying whether the cache data exist in the database or not if the cache data do not exist in the database;
and the update Redis and local cache data unit is used for updating the data in the Redis and the local cache data by using the data in the database if the update Redis and the local cache data unit exist, and releasing the synchronization lock.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method of data level two caching as claimed in any one of claims 1 to 5 when executing the program.
10. A non-transitory computer readable storage medium, having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the steps of the method of data level two caching according to any one of claims 1 to 5.
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