CN114157380B - ZNBASE distributed database clock synchronization method and system - Google Patents
ZNBASE distributed database clock synchronization method and system Download PDFInfo
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- CN114157380B CN114157380B CN202111473103.6A CN202111473103A CN114157380B CN 114157380 B CN114157380 B CN 114157380B CN 202111473103 A CN202111473103 A CN 202111473103A CN 114157380 B CN114157380 B CN 114157380B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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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
- G06F16/23—Updating
- G06F16/2308—Concurrency control
- G06F16/2315—Optimistic concurrency control
- G06F16/2322—Optimistic concurrency control using timestamps
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- 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
- G06F16/27—Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/08—Trunked mobile radio systems
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Abstract
The invention discloses a clock synchronization method and a clock synchronization system for a ZNBASE distributed database, which belong to the technical field of high-precision time synchronization of the ZNBASE distributed database, and the technical problem to be solved by the invention is how to improve the time synchronization precision, thereby improving the read-write concurrence of a cloud native NewSQL database, and the adopted technical scheme is as follows: according to the method, technologies based on Beidou satellite time service and PTP time synchronization are used for time service of a satellite receiving client, the PTP server is synchronized through a network cable, and the service server and the PTP server are synchronized to realize clock synchronization of a ZNBASE distributed database.
Description
Technical Field
The invention relates to the technical field of high-precision time synchronization of ZNBASE distributed databases, in particular to a clock synchronization method and a clock synchronization system of a ZNBASE distributed database.
Background
Clock synchronization is used for solving the core problem that concurrent transactions in a distributed database are difficult to confirm. The physical clock ((PT) has great deviation due to different device hardware, the Logic Clock (LC) can cause that the real execution sequence of the mutually uncorrelated transactions cannot be determined, the Vector Clock (VC) is proposed based on the logic clock, but the vector dimension is equal to the number of nodes, the space complexity is higher, the Hybrid Logic Clock (HLC) ensures that the physical clock and the logic clock agree as much as possible, and a mechanism using the HLC has an important condition that the physical clock synchronization error between each machine is as small as possible.
Disclosure of Invention
The invention aims to provide a ZNBASE distributed database clock synchronization method and a system, which are used for solving the problem of how to improve the time setting precision so as to improve the read-write concurrency of a cloud native NewSQL database.
The technical task of the invention is realized in a mode that a ZNBASE distributed database clock synchronization method is realized by using a technology based on Beidou satellite time service and PTP time synchronization, time service is carried out on a satellite receiving client, and a PTP server is synchronized through a network cable, and a service server and the PTP server are synchronized to realize the ZNBASE distributed database clock synchronization.
Preferably, the method is specifically as follows:
time service of Beidou satellite: time service from the Beidou satellite to a receiving client side on the ground;
the receiving client on the ground keeps in time: the receiving client on the ground receives the latest Beidou satellite time service time and synchronizes high-precision time information to the network card;
time synchronization: the receiving client on the ground and the disposed PTP server synchronize the latest high-precision time information through a directly connected network cable;
time synchronization request: the network card of the service server wants the PTP server to initiate a time setting request, and the PTP server synchronizes the latest time service time to the network card of the target service server;
business interactions between clusters: the operation system obtains the latest high-precision time setting clock information on the network card through the timing service.
More preferably, the high-precision time-setting clock information comprises a physical part and a logic part, the high-precision time-setting clock adopts a 64-bit machine physical clock as a time stamp, and adopts a delay submission strategy.
More preferably, the service interaction between clusters is specifically as follows:
the ZNBASE cluster acquires high-precision time synchronization clock information of an operating system, sets a maximum error as waiting time for delay submission, and changes the maximum error according to a specific experiment;
after the machine in the ZNBASE cluster receives things and waits for the time of the maximum error, taking the machine physical timestamp as a final timestamp record;
the service node of the ZNBASE cluster sends high-precision time setting clock information and things request information to a Leader node through a packet;
the Leader node synchronizes the forwarding of the transaction request to other Follow nodes;
when a transaction is accepted or sent by a show node, the hybrid logical timestamp is updated such that the physical portion of the hybrid logical timestamp is always equal to the largest physical clock in the cluster.
Preferably, the physical portion is compared prior to the logical portion when the hybrid logical timestamp is compared.
The ZNBASE distributed database clock synchronization system comprises a PTP time synchronization server, a service server and a test server, wherein the technology based on Beidou satellite time service and PTP time synchronization is used for time service of a satellite receiving test server, the PTP time synchronization server is synchronized through a network cable, the service server and the PTP time synchronization server are synchronized, the service server performs service data operation, synchronization time difference is added into a message of service data, and service interaction among clusters of the ZNBASE distributed database is performed.
Preferably, the service interaction between clusters means that the operating system obtains the latest high-precision time synchronization clock information on the network card through the timing service.
More preferably, the high-precision time-setting clock information comprises a physical part and a logic part, the high-precision time-setting clock adopts a 64-bit machine physical clock as a time stamp, and adopts a delay submission strategy.
More preferably, the service interaction between clusters is specifically as follows:
(1) The ZNBASE cluster acquires high-precision time-setting clock information of an operating system, sets maximum error as waiting time for delay submission, and changes the maximum error according to specific experiments;
(2) After the machine in the ZNBASE cluster receives things and waits for the time of the maximum error, taking the machine physical timestamp as a final timestamp record;
(3) The service node of the ZNBASE cluster sends high-precision time setting clock information and things request information to a Leader node through a packet;
(4) The Leader node synchronizes the forwarding of the transaction request to other Follow nodes;
(5) When a transaction is accepted or sent by a show node, the hybrid logical timestamp is updated such that the physical portion of the hybrid logical timestamp is always equal to the largest physical clock in the cluster.
Preferably, the physical portion is compared prior to the logical portion when the hybrid logical timestamp is compared.
The ZNBASE distributed database clock synchronization method and system have the following advantages:
the invention uses satellite time service, which can reduce the dependence on network delay error and server hardware; the hardware scheme of satellite time service and PTP time synchronization is used, so that the cluster performance of the database cluster can be improved; finally, for the scheme for deploying the multi-center scene requirement in different places, the stability and disaster recovery capacity of the whole scheme are improved;
secondly, the transaction conflict scene of the ZNBASE distributed database is relieved, and the reliability of the database cluster is improved; the force-making rub error among different places and multiple centers is controlled to be 100 microseconds, so that the disaster tolerance capability of the cluster is improved; performance among ZNBASE database clusters is improved by 20 percent, as shown in figure 3; meanwhile, compared with other clock synchronization schemes, the method is more suitable for multi-center scenes in different places, and the real working environment is simulated through comparison of data reliability, cluster performance and disaster tolerance;
according to the invention, through interaction between the Beidou satellite and the ground, high-precision time setting information is synchronized to a client on the ground, so that the high-precision time setting requirement in a multi-center scene in different places is ensured, and the business conflicts of the ZNBASE distributed database in the multi-center scene in different places are reduced; the essence of the high-precision time-setting clock is that the machines in the cluster can be guaranteed to be in a consistent time state through mutual communication among the machines, and the time error can be close to the surrounding minimum error machines; however, the error of the whole cluster gradually increases with the lapse of time, so that the execution time of the transaction gradually increases; thus, it is necessary to introduce one or more atomic clocks in the cluster with very small time offset rates, and other machines continuously eliminate their own time offset by continuously communicating with them;
fourthly, the high-precision time setting clock of the invention guarantees the time sequence of transaction determination in the transaction submitting stage of the ZNBASE distributed database, ensures the correct submission of the transaction, effectively reduces the conflict misjudgment of the transaction through high-precision time setting information in the ZNBASE cluster, and improves the concurrence capacity of the distributed database;
fifth, the combination of Beidou satellite time service identification and PTP time synchronization technology can meet the deployment requirements under special scenes (a multi-center high disaster tolerance requirement scene in different places, a complex network delay and a serious database transaction conflict scene); meanwhile, the low-delay product requirement of the ZNBASE distributed database clock is met, and the performance of the ZNBASE distributed database cluster can be improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a diagram of a hardware deployment architecture;
FIG. 2 is a hardware deployment map;
FIG. 3 is a graph of performance versus data.
Detailed Description
The ZNBASE distributed database clock synchronization method and system of the present invention are described in detail below with reference to the drawings and detailed description.
Example 1:
the ZNBASE distributed database clock synchronization method uses the technology based on Beidou satellite time service and PTP time synchronization, time service is carried out on a satellite receiving client, the PTP server is synchronized in time through a network cable, and the service server and the PTP server are synchronized to realize the ZNBASE distributed database clock synchronization; the method comprises the following steps:
s1, beidou satellite time service: time service from the Beidou satellite to a receiving client side on the ground;
s2, the receiving client on the ground keeps time: the receiving client on the ground receives the latest Beidou satellite time service time and synchronizes high-precision time information to the network card;
s3, time synchronization: the receiving client on the ground and the disposed PTP server synchronize the latest high-precision time information through a directly connected network cable;
s4, time synchronization request: the network card of the service server wants the PTP server to initiate a time setting request, and the PTP server synchronizes the latest time service time to the network card of the target service server;
s5, service interaction among clusters: the operation system obtains the latest high-precision time setting clock information on the network card through the timing service.
The high-precision time setting clock information in the embodiment comprises a physical part and a logic part, and the high-precision time setting clock adopts a 64-bit machine physical clock as a time stamp and adopts a delay submission strategy.
The service interaction between clusters in step S5 of this embodiment is specifically as follows:
s501, the ZNBASE cluster acquires high-precision time synchronization clock information of an operating system, and sets a maximum error as waiting time for delay submission, wherein the maximum error is changed according to a specific experiment;
s502, after a machine in the ZNBASE cluster receives things and waits for the time of the maximum error, recording a machine physical time stamp as a final time stamp;
s503, the service node of the ZNBASE cluster sends high-precision time setting clock information and things request information to a Leader node through a packet;
s504, the Leader node forwards and synchronizes the object request to other Follow nodes;
s505, when the Follow node accepts or sends the transaction, the mixed logic timestamp is updated so that the physical part of the mixed logic timestamp is always equal to the largest physical clock in the cluster.
When the mixed logic time stamps are compared, the physical part is compared first, and then the logic part is compared.
Example 2:
as shown in figures 1 and 2, the ZNBASE distributed database clock synchronization system comprises a PTP time synchronization server, a service server and a test server, wherein the technology based on Beidou satellite time service and PTP time synchronization is used for performing time service on a satellite receiving test server, synchronizing time of the PTP time synchronization server is performed through a network cable, the service server and the PTP time synchronization server are used for synchronizing service data, and a synchronization time difference is added into a message of the service data to perform service interaction among clusters of the ZNBASE distributed database.
The service interaction between clusters in this embodiment refers to that the operating system obtains the latest high-precision time synchronization clock information on the network card through the timing service.
The high-precision time setting clock information in the embodiment comprises a physical part and a logic part, and the high-precision time setting clock adopts a 64-bit machine physical clock as a time stamp and adopts a delay submission strategy.
The service interaction between clusters in this embodiment is specifically as follows:
(1) The ZNBASE cluster acquires high-precision time-setting clock information of an operating system, sets maximum error as waiting time for delay submission, and changes the maximum error according to specific experiments;
(2) After the machine in the ZNBASE cluster receives things and waits for the time of the maximum error, taking the machine physical timestamp as a final timestamp record;
(3) The service node of the ZNBASE cluster sends high-precision time setting clock information and things request information to a Leader node through a packet;
(4) The Leader node synchronizes the forwarding of the transaction request to other Follow nodes;
(5) When a transaction is accepted or sent by a show node, the hybrid logical timestamp is updated such that the physical portion of the hybrid logical timestamp is always equal to the largest physical clock in the cluster.
In the hybrid logic timestamp comparison in this embodiment, the physical portion is compared first, and then the logical portion is compared.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A ZNBASE distributed database clock synchronization method is characterized in that the method uses a technology based on Beidou satellite time service and PTP time synchronization to time service a satellite receiving client, synchronizes time of a PTP server through a network cable, and synchronizes time of a service server and the PTP server to realize ZNBASE distributed database clock synchronization; the method comprises the following steps:
time service of Beidou satellite: time service from the Beidou satellite to a receiving client side on the ground;
receiving client time service on ground: the receiving client on the ground receives the latest Beidou satellite time service time and synchronizes high-precision time information to the network card;
time synchronization: the receiving client on the ground and the disposed PTP server synchronize the latest high-precision time information through a directly connected network cable;
time synchronization request: the network card of the service server initiates a time setting request to the PTP server, and the PTP server synchronizes the latest time service time to the network card of the target service server;
business interactions between clusters: the operation system obtains the latest high-precision time setting clock information on the network card through the timing service; the method comprises the following steps:
the ZNBASE cluster acquires high-precision time tick information of an operating system, and sets the maximum error as waiting time for delaying submission;
after the machine in the ZNBASE cluster receives the transaction and waits for the time of the maximum error, the machine physical timestamp is used as a final timestamp record;
the service node of the ZNBASE cluster sends high-precision time setting clock information and transaction request information to a Leader node through a packet;
the Leader node synchronizes the forwarding of the transaction request to other Follow nodes;
when a transaction is received or sent by a show node, the hybrid logical timestamp is updated such that the physical portion of the hybrid logical timestamp is always equal to the largest physical clock in the cluster.
2. The znase distributed database clock synchronization method of claim 1, wherein the high precision time tick information comprises a physical portion and a logical portion, the high precision time tick employs a 64 bit machine physical clock as a timestamp, and employs a delayed commit strategy.
3. The znase distributed database clock synchronization method of claim 1, wherein the physical portion is compared prior to the logical portion when the hybrid logical time stamps are compared.
4. The ZNBASE distributed database clock synchronization system is characterized by comprising a PTP time synchronization server, a service server and a test server, wherein the technology based on Beidou satellite time service and PTP time synchronization is used for performing time service on a satellite receiving test server, synchronizing time of the PTP time synchronization server is performed through a network cable, the service server and the PTP time synchronization server are used for synchronizing time, the service server performs service data operation, synchronization time difference is added into a message of service data, and service interaction among clusters of the ZNBASE distributed database is performed; the service interaction among the clusters is specifically as follows:
(1) The ZNBASE cluster acquires high-precision time setting clock information of an operating system, and sets the maximum error as waiting time for delay submission;
(2) After the machine in the ZNBASE cluster receives the transaction and waits for the time of the maximum error, taking the machine physical timestamp as a final timestamp record;
(3) The service node of the ZNBASE cluster sends high-precision time setting clock information and transaction request information to a Leader node through a packet;
(4) The Leader node synchronizes the transaction request forwarding to other Follow nodes;
(5) When a transaction is accepted or sent by a show node, the hybrid logical timestamp is updated such that the physical portion of the hybrid logical timestamp is always equal to the largest physical clock in the cluster.
5. The ZNBASE distributed database clock synchronization system of claim 4, wherein the business interaction between clusters is that the operating system obtains the latest high-precision time-setting clock information on the network card through the timing service.
6. The znase distributed database clock synchronization system of claim 4, wherein the high precision time tick information comprises a physical portion and a logical portion, the high precision time tick employing a 64 bit machine physical clock as a timestamp and a delayed commit strategy.
7. The znase distributed database clock synchronization system of claim 4, wherein the hybrid logic time stamp comparison is performed by comparing the physical portion prior to comparing the logical portion.
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| CN102447553A (en) * | 2010-10-12 | 2012-05-09 | 研祥智能科技股份有限公司 | Realizing device of accurate time synchronization protocol |
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