CN106533603A - Time synchronizing method and device for distributed system - Google Patents
Time synchronizing method and device for distributed system Download PDFInfo
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- CN106533603A CN106533603A CN201611181542.9A CN201611181542A CN106533603A CN 106533603 A CN106533603 A CN 106533603A CN 201611181542 A CN201611181542 A CN 201611181542A CN 106533603 A CN106533603 A CN 106533603A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
Abstract
The invention discloses a time synchronizing method and device for a distributed system. The distributed system comprises N nodes which are connected with one another, wherein N is a natural number which is larger than 1. For one of the nodes, the method comprises the following steps: receiving time synchronizing messages sent by the rest of nodes; acquiring and saving second local system time T2 when the time synchronizing messages are received; calculating a second local receiving time interval deltat2 for a node n; judging whether a difference value between the second local receiving time interval deltat2 for the node n and a first local transmitting time interval deltat1 of the node n is within a set threshold value or not, and if so, saving a system time difference value Tr between the currently-received second local system time interval T2 of the node n and the first local system time T1; otherwise, discarding the received time synchronizing messages. Through adoption of the method, any node is used for receiving the time synchronizing messages of the other nodes to realize synchronization of system time, so that the system load is lowered.
Description
Technical field
The present invention relates to network communication technology field, more particularly to a kind of method for synchronizing time of distributed system and dress
Put.
Background technology
In distributed system, each node will realize the synchronization of time, could provide service infrastructure for application layer well.
Ideally, receiving terminal node can using the timestamp in the message for receiving as judge the message whether time-out according to
According to.But when actually used, it is possible to occur that message fails to send or connects in the kernel transmission relief area of sender node
The relief area of receiving end node is not employed layer and reads and cause message to pile up, and network reason or the receiving terminal of sender node
The processing speed of node causes message delay slowly.Which results in the timestamp in message to be not suitable for directly as judging message
The foundation of time-out.
A kind of method of known message synchronization is described in standard IEEE -1588.According to the method, main frame ginseng
Multiple synchronization messages are sent with person, time labelling is included in synchronization message, main frame participant is determined by the clock of its own
These time labellings.Slave participant can be determined by time labelling between the clock of itself and the clock of main frame participant
Time difference.Then, the time difference also transmission time comprising synchronization message.Therefore, slave participant will then inquire message
Main frame participant is sent to, and comes time of measuring interval by the clock of itself, until receiving the response of main frame participant
Message.Slave participant determines the transmission time of message by by the time of measurement divided by 2.Then, slave participant with when
Between difference and message transmission time correcting its time.Under this kind of mode, not only need each node of distributed system with
Repeatedly communicate between main frame (i.e. standard time service device), and subsequently calculate the process complexity of lock in time, undoubtedly improve
System loading.
The content of the invention
In view of this, the present invention proposes a kind of method for synchronizing time of distributed system and device, to solve prior art
Present in technological deficiency.
For reaching above-mentioned purpose, what the technical scheme of the embodiment of the present invention was realized in：
The embodiment of the invention discloses a kind of method for synchronizing time of distributed system, the distributed system includes N number of mutual
The node being connected, and N is the natural number more than 1；
For node m therein, the method includes：
A1, the time synchronized message for receiving remaining node transmission, wherein, the time synchronized message includes sending the time
The node identification of the node of synchronization message, when generating the time synchronized message the first local system time T1 of the node and
First local transmission time interval Δ t1；
A2, obtain and preserve the second local system time T2 when receiving each time synchronized message；
A3, calculating are for the second local reception time interval Δ t2 of node n；Wherein, the second local reception time
Interval of delta t 2 is：It is currently received the second local system time T2 when node n sends time synchronized message to receive with last time
The difference of the second local system time T2 during node n transmission time synchronized message；
Node m is any one in N number of node, and node n is any one for removing node m in N number of node；
A4, judge that first of the second local reception time interval Δ t2 and node n for node n local sends the time
The difference of interval of delta t 1 whether in the threshold value of setting, if it is, entering step a5；If it is not, then entering step a6；
A5, preservation are currently received the second local system time T2 of the time synchronized message of node n transmissions and the time
System time difference Tr of the first local system time T1 in synchronization message, and return to step a1；
A6, directly the time synchronized message for receiving is abandoned, and return to step a1.
Alternatively, the data-message that each node sends includes：The node identification of the node, data-message send the time
T3, data-message time-out time T4 and data to be sent；
For node m, the method includes：
B1, the data-message for receiving the node n, and obtain the second local system when receiving the data message
Time T2；
B2, node m calculate T remaining time of the data-message by below equation：
T=data-messages transmission time T3+ node n remaining time is surpassed with the system time difference Tr+ data-message of node m
When time T4- node m the second local system time T2 when being currently received data-message,
If remaining time, T was more than 0, into step b3；If remaining time, T was less than or equal to 0, into step b4；
B3, system time difference Tr that data-message transmission time T3 in the data-message is added node n and node m
Afterwards, data-message is sent to operation layer and is processed；
B4, judge data-message time-out, directly the data-message is abandoned.
Alternatively, in step a4, the scope of the threshold value is -20～1000 milliseconds.
The embodiment of the invention discloses a kind of time synchronism apparatus of distributed system, the distributed system includes N number of mutual
The node being connected, and N is the natural number more than 1；
In each node, for node m therein, the device includes the time synchronism apparatus：
Time synchronized message reception module, receives the time synchronized message that remaining node sends, wherein, the time synchronized
The first of node when message includes the node identification of the node for sending the time synchronized message, generates the time synchronized message
Ground system time T1 and the first local transmission time interval Δ t1；
Local system time acquisition module, obtains and preserves the second local system when receiving each time synchronized message
Time T2；
Second local reception time interval computing module, calculates for the second local reception time interval Δ t2 of node n；
Wherein, the second local reception time interval Δ t2 is second when being currently received node n transmission time synchronized message
Ground system time T2 and last time receives the difference of the second local system time T2 when node n sends time synchronized message；
Node m is any one in N number of node, and node n is any one for removing node m in N number of node；
Time interval comparison module, judges of the second local reception time interval Δ t2 and node n for node n
Whether the difference of one local transmission time interval Δ t1 is in the threshold value of setting, if it is, notice time synchronized message first
Processing module action；If it is not, then notifying time synchronized message Second processing module action；
Time synchronized message first processing module, preservation are currently received the second of the time synchronized message of node n transmissions
System time difference Tr of the first local system time T1 in local system time T2 and the time synchronized message；
The time synchronized message for receiving directly is abandoned by time synchronized message Second processing module.
Alternatively, the data-message that each node sends includes：The node identification of the node, data-message send the time
T3, data-message time-out time T4 and data to be sent；
For node m, when the data-message of the node n is received, the device includes：
Data-message receiver module, receives the data-message of the node n, and obtains when receiving the data message
The second local system time T2；
Remaining time, computing module, calculated T remaining time of the data-message by below equation：
T=data-messages transmission time T3+ node n remaining time is surpassed with the system time difference Tr+ data-message of node m
When time T4- node m the second local system time when being currently received data-message,
If remaining time, T was more than 0, data-message first processing module is notified；If remaining time, T was less than or equal to 0, notify
Data-message Second processing module；
Data-message in the data-message is sent time T3 plus node n and section by data-message first processing module
After system time difference Tr of point m, the data-message is sent to operation layer and is processed；
Data-message Second processing module, the data-message is abandoned.
Alternatively, in time interval comparison module, the scope of the threshold value is -20～1000 milliseconds.
The method for synchronizing time of the present invention, obtains two by making any node receive the time synchronized message of other nodes
System time difference between individual node realizing the synchronization of system time, compared with prior art, it is not necessary to main and subordinate node,
The participation of standard time service device is not needed, so as to alleviate the load of system.
Description of the drawings
Flow charts of the Fig. 1 for the method for synchronizing time of the distributed system of the embodiment of the present invention；
Process charts of the Fig. 2 for the data-message of the distributed system of the embodiment of the present invention；
Specific example figures of the Fig. 3 for the distributed system of the embodiment of the present invention；
Time synchronism apparatus figures one of the Fig. 4 for the distributed system of the embodiment of the present invention；
Time synchronism apparatus figures two of the Fig. 5 for the distributed system of the embodiment of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below by way of specific embodiment and join
See accompanying drawing, the present invention is described in detail.
In order to solve, time synchronization process present in prior art is complicated, increases the technological deficiency of system loading, this
Bright embodiment provides a kind of method for synchronizing time of distributed system, it is not necessary to main and subordinate node, it is not required that the standard time takes
The participation of business device, so that alleviate the load of system.
The distributed system of the present embodiment includes the node of N (natural numbers of the N more than 1) individual interconnection, and N number of node exists
Priority in distributed system is identical, is coordination, not master slave relation.It should be noted that for any node, both
Time synchronized message or data-message that other nodes send can be received, while can also send time synchronized message or data-message
Give other nodes.
To achieve these goals, the method for synchronizing time is as shown in figure 1, including step a1～a4：
For node m therein (node m is any one in N number of node), method is as follows：
A1, the time synchronized message for receiving remaining node transmission, wherein, the time synchronized message includes sending the time
The node identification of the node of synchronization message, the first local system time T1 of node when generating the time synchronized message, with
And the first local transmission time interval Δ t1.
First local transmission time interval Δ t1 can be fixed value, such as 1 minute, 10 seconds etc., or it is non-solid
Definite value, such as primary time interval Δ t1 are 10 seconds, and secondary time interval Δ t1 is 15 seconds etc..For each
In the first time synchronized message that node sends, the first local transmission time interval Δ t1 is 0.
It should be noted that the first local system time T1 is not changeless, can also be to be continually changing, to send out
The system time of the node m of the time synchronized message is given to be defined.For example when sending first time synchronized message, the first local system
System time T1 is 9:00；When sending Article 2 time synchronized message, the first local system time T1 is 9:05 etc..
Alternatively, time synchronized message also includes sequence number N, for whether there is interrupted sequence number in the middle of checking.But
Even if it should be noted that there is interrupted sequence number, that is, having time synchronization message not to be sent to destination node m, to this programme
Realization have no materially affect.
A2, obtain and preserve the second local system time T2 when receiving each time synchronized message.
It should be noted that for node m, just triggering which after time synchronized message is received and obtaining the second local system
System time T2.
A3, calculating are for the second local reception time interval Δ t2 of node n；Wherein, the second local reception time
Interval of delta t 2 is：It is currently received the second local system time T2 when node n sends time synchronized message to receive with last time
The difference of the second local system time T2 during node n transmission time synchronized message.
That is, want node m obtaining for the second local reception time interval Δ t2 of node n, at least need to obtain
Take two time synchronized message that node n sends over can just realize.Node n is to remove appointing for node m in N number of node
Meaning one.
In addition, what second local reception time interval Δ t2 was also continually changing, it is updated after needing to calculate every time.
A4, judge that first of the second local reception time interval Δ t2 and node n for node n local sends the time
The difference of interval of delta t 1 whether in the threshold value of setting, if it is, entering step a5；If it is not, then entering step a6.
Wherein, the threshold range can be arranged according to actual needs, for example, -20～1000 milliseconds.
A5, preservation are currently received the second local system time T2 of the time synchronized message of node n transmissions and the time
System time difference Tr of the first local system time T1 in synchronization message, and return to step a1.
System time difference Tr=T2-T1, is the system time difference between two nodes m and n.When receive from
During the data-message that node n sends, the system time of the data-message can be changed by supplementing the system time difference
For the system time of this node, can be described in detail later.
A6, directly the time synchronized message for receiving is abandoned, and return to step a1.
Specifically, for the time synchronized message more than threshold range, it is believed that for time synchronized message delay, specifically
It is due to system and network reason when sending for time synchronized message, slow as the node processing speed of receiving terminal or receive the time and surpass
Cross and be expected.For the time synchronized message for being not up to the threshold range, it is believed that pile up for time synchronized message, when specially
Between synchronization message send when, transmitting terminal node kernel send relief area in do not send or receiving node reception relief area
In be not employed layer reading.Under this two kinds of situations, directly the time synchronized message for receiving is abandoned.
The above-mentioned flow process for realizing time synchronized.Process to any node receiving data message is illustrated below.
The data-message that each node sends includes：The node identification of the node, data-message send time T3, data and disappear
Breath time-out time T4 and data to be sent.
It should be noted that for node m, to receiving data message, need first to be calculated this node and its
System time difference between remaining any node, needs at least two time synchronized for receiving Correspondent Node transmission to disappear in other words
Breath just can be with.That is, in practical application, when each node is to destination node transmission data-message, needing to send at least
Two time synchronized message just can be with to after destination node.
In addition, in concrete transmission, data-message is independent of one another on the transmission time with time synchronized message, it is possible to send out
Some time synchronized message are sent, a data message can be just sent.
For node m, for the processing method of data-message is referring to Fig. 2, including：
B1, the data-message for receiving the node n, and obtain the second local system when receiving the data message
Time T2；
B2, node m calculate T remaining time of the data-message by below equation：
Remaining time T=T3+Tr+T4-T2
=T3+T2-T1+T4-T2
=T3+T4-T1
Wherein, T3 is that data-message sends the time, and Tr is the system time difference of node n and node m, and T4 is data-message
Time-out time, second local system times when being currently received data-message of the T2 for node m, T1 is to receive node n
The first local system time in the time synchronized message.
If remaining time, T was more than 0, into step b3；If remaining time, T was less than or equal to 0, into step b4.
B3, system time difference Tr that data-message transmission time T3 of the data-message is added node n and node m
Afterwards, data-message is sent to operation layer and is processed, and return to step b1.
By this step b3, the system time of the data-message just can be converted to the system time of this node.
B4, judge data-message time-out, directly the data-message is abandoned, and return to step b1.
Referring to Fig. 3, more intuitively illustrate.
In Fig. 3, node m, n, k are the node in distributed system.The present embodiment so that node m is as receiving node as an example,
Node n and node k send time synchronized message and data-message to node m.
For node m, the time synchronized message for receiving for the first time is that node n was generated at the T1 moment, and obtains reception
To the second local system time T2 during time synchronization message；
The time synchronized message for receiving for the second time is that node k was generated at the T1 ' moment.Now, node m takes and receives this
The second local system time T2 ' during time synchronized message, but the second local reception time interval Δ t2 is not calculated, only protect
Two time synchronized message and corresponding second local system time of every time synchronized message is deposited, because two times
Synchronization message is not sent for same node.
The time synchronized message that third time is received is that node n was generated at the T1+ Δ t1 moment.Now, node m according to when
Between the node identification that carries in synchronization message judge the time synchronized message and send for node n, obtain and receive the time
The second local system time T2+ Δ t2 during synchronization message, and after judging Δ t2- Δs t1 in the threshold value of setting, be
The calculating of system time difference Tr.
When the data-message that node n sends is received the 4th time, according to above-mentioned steps b1～b4 process, here is just
Repeat no more.
The embodiment of the invention also discloses a kind of time synchronism apparatus of distributed system, the distributed system includes N number of
The node of interconnection, and N is the natural number more than 1；
The time synchronism apparatus in each node, for node m therein, the device referring to Fig. 4, including：
Time synchronized message reception module, the time synchronized message for receiving remaining node transmission, wherein, the time synchronized
First of node when message includes the node identification of the node for sending the time synchronized message, generates the time synchronized message
Local system time T1 and the first local transmission time interval Δ t1；
Local system time acquisition module, obtain and preserve the second local system when receiving each time synchronized message
Time T2；
Second local reception time interval computing module, calculating are for the second local reception time interval Δ t2 of node n；
Wherein, the second local reception time interval Δ t2 is second when being currently received node n transmission time synchronized message
Ground system time T2 and last time receives the difference of the second local system time T2 when node n sends time synchronized message；
Node m is any one in N number of node, and node n is any one for removing node m in N number of node；
Time interval comparison module, judges of the second local reception time interval Δ t2 and node n for node n
Whether the difference of one local transmission time interval Δ t1 is in the threshold value of setting, if it is, notice time synchronized message first
Processing module action；If it is not, then notifying time synchronized message Second processing module action；
Time synchronized message first processing module, preservation are currently received the second of the time synchronized message of node n transmissions
System time difference Tr of the first local system time T1 in local system time T2 and the time synchronized message；
The time synchronized message for receiving directly is abandoned by time synchronized message Second processing module.
For node m, when the data-message of the node n is received, referring to Fig. 5, the device includes：
Data-message receiver module, the data-message for receiving the node n, and obtain when receiving the data message
The second local system time T2.
The data-message that each node sends includes：The node identification of the node, data-message send time T3, data and disappear
Breath time-out time T4 and data to be sent.
Remaining time computing module, calculate T remaining time of the data-message by below equation：
T=data-messages transmission time T3+ node n remaining time is surpassed with the system time difference Tr+ data-message of node m
When time T4- node m the second local system time T2 when being currently received data-message,
If remaining time, T was more than 0, data-message first processing module action is notified；If remaining time, T was less than or equal to 0, lead to
Primary data message Second processing module action；
Data-message first processing module, the data-message is sent to operation layer processed, and notify data-message
Receiver module action；
Data-message Second processing module, judge data-message time-out, directly the data-message is abandoned, and notifies number
According to message reception module action
The method for synchronizing time of the present invention, is somebody's turn to do by making any node receive the time synchronized message of other nodes
System time difference between two nodes is realizing the synchronization of system time.
Compared with prior art, with advantages below：
(1) disposing message system need not increase time server, save hardware cost.
(2), there is no Single Point of Faliure in no main and subordinate node.
(3) the local computer system time is not changed.
(4) other system for computer times are not directly relied on.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements done etc. are should be included within the scope of protection of the invention.
Claims (6)
1. a kind of method for synchronizing time of distributed system, it is characterised in that the distributed system includes the section of N number of interconnection
Point, and N is the natural number more than 1；
For node m therein, the method includes：
A1, the time synchronized message for receiving remaining node transmission, wherein, the time synchronized message includes sending the time synchronized
The node identification of the node of message, when generating the time synchronized message node the first local system time T1 and first
Local transmission time interval Δ t1；
A2, obtain and preserve the second local system time T2 when receiving each time synchronized message；
A3, calculating are for the second local reception time interval Δ t2 of node n；Wherein, the second local reception time interval
Δ t2 is：Be currently received the second local system time T2 when node n sends time synchronized message node n was received with last time
The difference of the second local system time T2 during transmission time synchronized message；
Node m is any one in N number of node, and node n is any one for removing node m in N number of node；
A4, the second local reception time interval Δ t2 and the first local transmission time interval of node n for judging for node n
The difference of Δ t1 whether in the threshold value of setting, if it is, entering step a5；If it is not, then entering step a6；
A5, preservation are currently received the second local system time T2 of the time synchronized message of node n transmissions and the time synchronized
System time difference Tr of the first local system time T1 in message, and return to step a1；
A6, directly the time synchronized message for receiving is abandoned, and return to step a1.
2. the method for synchronizing time of distributed system according to claim 1, it is characterised in that the number that each node sends
Include according to message：The node identification of the node, data-message send time T3, data-message time-out time T4 and to be sent
Data；
For node m, the method includes：
B1, the data-message for receiving the node n, and obtain the second local system time when receiving the data message
T2；
B2, node m calculate T remaining time of the data-message by below equation：
When T=data-messages transmission time T3+ node n remaining time is overtime with the system time difference Tr+ data-message of node m
Between T4- node m the second local system time T2 when being currently received data-message,
If remaining time, T was more than 0, into step b3；If remaining time, T was less than or equal to 0, into step b4；
After b3, system time difference Tr by data-message transmission time T3 in the data-message plus node n and node m,
Data-message is sent to operation layer and is processed；
B4, judge data-message time-out, directly the data-message is abandoned.
3. the method for synchronizing time of distributed system according to claim 1, it is characterised in that in step a4, described
The scope of threshold value is -20～1000 milliseconds.
4. a kind of time synchronism apparatus of distributed system, it is characterised in that the distributed system includes the section of N number of interconnection
Point, and N is the natural number more than 1；
In each node, for node m therein, the device includes the time synchronism apparatus：
Time synchronized message reception module, receives the time synchronized message that remaining node sends, wherein, the time synchronized message
Node identification including the node for sending the time synchronized message, when generating the time synchronized message the first of the node local it is
System time T1 and the first local transmission time interval Δ t1；
Local system time acquisition module, obtains and preserves the second local system time when receiving each time synchronized message
T2；
Second local reception time interval computing module, calculates for the second local reception time interval Δ t2 of node n；Its
In, the second local reception time interval Δ t2 be currently received it is second local when node n sends time synchronized message
System time T2 and last time receive the difference of the second local system time T2 when node n sends time synchronized message；
Node m is any one in N number of node, and node n is any one for removing node m in N number of node；
Time interval comparison module, judges the first of the second local reception time interval Δ t2 and node n for node n
Whether the difference of ground transmission time interval Δ t1 is in the threshold value of setting, if it is, notifying that time synchronized message first is processed
Module action；If it is not, then notifying time synchronized message Second processing module action；
Time synchronized message first processing module, preserve the time synchronized message for being currently received node n transmissions second are local
System time difference Tr of the first local system time T1 in system time T2 and the time synchronized message；
The time synchronized message for receiving directly is abandoned by time synchronized message Second processing module.
5. time synchronism apparatus of distributed system according to claim 4, it is characterised in that the number that each node sends
Include according to message：The node identification of the node, data-message send time T3, data-message time-out time T4 and to be sent
Data；
For node m, when the data-message of the node n is received, the device includes：
Data-message receiver module, receives the data-message of the node n, and obtain when receiving the data message the
Two local system time T2；
Remaining time, computing module, calculated T remaining time of the data-message by below equation：
When T=data-messages transmission time T3+ node n remaining time is overtime with the system time difference Tr+ data-message of node m
Between T4- node m the second local system time T2 when being currently received data-message,
If remaining time, T was more than 0, data-message first processing module is notified；If remaining time, T was less than or equal to 0, data are notified
Message Second processing module；
Data-message in the data-message is sent time T3 plus node n and node m's by data-message first processing module
After system time difference Tr, the data-message is sent to operation layer and is processed；
Data-message Second processing module, the data-message is abandoned.
6. time synchronism apparatus of distributed system according to claim 4, it is characterised in that compare mould in time interval
In block, the scope of the threshold value is -20～1000 milliseconds.
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| CN109150358A (en) * | 2018-08-16 | 2019-01-04 | 中国科学院声学研究所 | A kind of distributed clock synchronous method and system |
| CN111208866A (en) * | 2019-12-27 | 2020-05-29 | 视联动力信息技术股份有限公司 | System time adjusting method and device |
| CN111970080A (en) * | 2020-08-28 | 2020-11-20 | 石家庄科林电气股份有限公司 | Time synchronization method for master and slave equipment |
| CN112003668A (en) * | 2020-08-28 | 2020-11-27 | 石家庄科林电气股份有限公司 | Real-time dynamic tracking time synchronization method |
| CN112235068A (en) * | 2020-10-14 | 2021-01-15 | 许继集团有限公司 | Master-slave machine synchronization method and device for distributed power system |
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