CN106934050A - The determination method and device of file copy amount in a kind of distributed memory system - Google Patents
The determination method and device of file copy amount in a kind of distributed memory system Download PDFInfo
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- CN106934050A CN106934050A CN201710157224.7A CN201710157224A CN106934050A CN 106934050 A CN106934050 A CN 106934050A CN 201710157224 A CN201710157224 A CN 201710157224A CN 106934050 A CN106934050 A CN 106934050A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1458—Management of the backup or restore process
- G06F11/1464—Management of the backup or restore process for networked environments
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
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- G06F16/182—Distributed file systems
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Abstract
The invention discloses a kind of determination method and device of file copy amount in distributed memory system, the method includes：The grade separation and the corresponding reliability thresholds of each grade separation of each file that storage pre-builds；When copy storage request is got, the goal gradient classification of the corresponding file of acquisition request is stored to determine the corresponding target reliabilities threshold value of goal gradient classification according to copy；Calculation of Reliability rule according to pre-building calculates the quantity of the back end needed for reaching target reliabilities threshold value.This method is together decided on by two parameters of grade separation and reliability thresholds of file, is not that the copy amount of file carries out unified regulation.Therefore, the method can not only ensure that the reliability of important file is higher, and the copy of common file will not take too big memory space.Additionally, the determining device of file copy amount equally has above-mentioned effective effect in distributed memory system provided by the present invention.
Description
Technical field
The present invention relates to technical field of distributed memory, file number of copies in more particularly to a kind of distributed memory system
Method for determination of amount and device.
Background technology
In distributed file system, generally for each file for, other back end all in system are stored with
Its corresponding copy.Deposited in the form of copy, mainly there are two advantages：First it is the reliability of the system that improves, when a certain
When individual back end fails because of uncontrollable factor, the file of this back end has backup on other back end,
So as to the data in guarantee system are still as a whole available；The response speed of digital independent is also improved simultaneously, i.e.,
The copy of same file is housed in different back end, the fastest data of current accessed can be selected when reading
Node obtains data, so as to improve the overall response speed of system.
Typically empirically be worth in the prior art carries out unified regulation to the copy amount of each file.It is readily appreciated that
, from improve system reliability in terms of, the quantity of copy be it is The more the better, but increasing for copy amount, also can
Cause the waste of memory space and increase the maintenance cost of data consistency.Therefore, copy amount brings memory space compared with conference
On pressure, in addition, if copy amount is smaller, be easily reduced the reliability of system.
Therefore, how the copy amount of file in system is rationally set, the requirement of reliability can be met, again will not be to depositing
It is those skilled in the art's problem demanding prompt solution that larger adverse effect is caused in storage space.
The content of the invention
It is an object of the invention to provide a kind of determination method and device of file copy amount in distributed memory system, use
In the copy amount of file in reasonable setting system, the requirement of reliability can be met, will not cause larger to memory space again
Adverse effect.
In order to solve the above technical problems, the present invention provides a kind of determination side of file copy amount in distributed memory system
Method, including：
The grade separation and the corresponding reliability thresholds of each grade separation of each file that storage pre-builds；
When copy storage request is got, the goal gradient point of the corresponding file of acquisition request is stored according to the copy
Class is classified corresponding target reliabilities threshold value with determining the goal gradient；
Calculation of Reliability rule according to pre-building calculates the data section needed for reaching the target reliabilities threshold value
The quantity of point；
Wherein, the parameter of Calculation of Reliability rule includes the mean free error time of back end, back end
Quantity and reliability time, the quantity of the back end of the copy amount of the file for needed for.
Preferably, the Calculation of Reliability rule that the basis pre-builds is calculated and reaches the target reliabilities threshold value institute
The quantity of the back end for needing is specifically included：
Remaining any one back end stores the copy of the file in selecting system；
The current reliability of the file is calculated according to Calculation of Reliability rule；
Judge current reliability whether more than the target reliabilities threshold value；
If it is not, then returning to the copy of remaining any one back end storage file in the selecting system
Step；
If it is, the quantity of required back end be current system in store the copy back end number
Amount.
Preferably, the Calculation of Reliability rule that the basis pre-builds is calculated and reaches the target reliabilities threshold value institute
The quantity of the back end for needing is specifically included：
Reliability highest node stores the copy of the file in remaining back end in selecting system；
The current reliability of the file is calculated according to Calculation of Reliability rule；
Judge current reliability whether more than the target reliabilities threshold value；
If it is not, then returning in the selecting system, reliability highest node stores the text in remaining back end
The step of copy of part；
If it is, the quantity of required back end be current system in store the copy back end number
Amount.
Preferably, the Calculation of Reliability rule that the basis pre-builds is calculated and reaches the target reliabilities threshold value institute
The quantity of the back end for needing is specifically included：
The node that load factor is minimum in remaining back end in selecting system stores the copy of the file；
The current reliability of the file is calculated according to Calculation of Reliability rule；
Judge current reliability whether more than the target reliabilities threshold value；
If it is not, then returning to the node that load factor is minimum in remaining back end in the selecting system stores the text
The step of copy of part；
If it is, the quantity of required back end be current system in store the copy back end number
Amount.
Preferably, the Calculation of Reliability rule is specially：
Wherein, as i=0, θ0It is that the file is stored in back end n0On mean free error time, work as i=1-k
When, θ1-θkRepresent that the copy of the file is respectively stored in back end n1-nkOn mean free error time, t represents reliable
The property time.
Preferably, the grade separation includes Three Estate, is respectively according to the corresponding reliability thresholds of the rank of grade
99.99%th, 99%, 95%.
Preferably, also include：
The back end of the back end of the record storage file and the copy of the storage file.
Preferably, also include：
When the back end that any one back end breaks down and breaks down is in the back end of record, then
More new record.
In order to solve the above technical problems, the present invention also provides a kind of determination of file copy amount in distributed memory system
Device, including：
Memory cell, for store the grade separation of each file that pre-builds and each grade separation is corresponding can
By property threshold value；
Determining unit, for when copy storage request is got, the corresponding text of acquisition request being stored according to the copy
The goal gradient of part classifies to determine the corresponding target reliabilities threshold value of the goal gradient classification；
Computing unit, the target reliabilities threshold value is reached for being calculated according to the Calculation of Reliability rule for pre-building
The quantity of required back end；
Wherein, the parameter of Calculation of Reliability rule includes the mean free error time of back end, back end
Quantity and reliability time, the quantity of the back end of the copy amount of the file for needed for.
The determination method of file copy amount in distributed memory system provided by the present invention, including：Storage is built in advance
The grade separation of vertical each file and the corresponding reliability thresholds of each grade separation；Asked when copy storage is got
When, the goal gradient classification of the corresponding file of acquisition request is stored to determine the goal gradient classification correspondence according to the copy
Target reliabilities threshold value；Calculation of Reliability rule according to pre-building is calculated needed for reaching the target reliabilities threshold value
Back end quantity；Wherein, the parameter of the Calculation of Reliability rule includes mean free error time, the number of back end
Quantity and reliability time according to node, the quantity of the back end of the copy amount of the file for needed for.This method is logical
Cross what two parameters of grade separation and reliability thresholds of file were together decided on, be not that the copy amount of file is unified
Regulation.Therefore, the method can not only ensure that the reliability of important file is higher, and the copy of common file will not take
Too big memory space, can meet the requirement of reliability, will not cause larger adverse effect to memory space again.Additionally, this
The determining device of file copy amount equally has above-mentioned effective effect in the provided distributed memory system of invention.
Brief description of the drawings
In order to illustrate more clearly the embodiments of the present invention, the accompanying drawing to be used needed for embodiment will be done simply below
Introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill people
For member, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the stream of the determination method of file copy amount in a kind of distributed memory system provided in an embodiment of the present invention
Cheng Tu；
Fig. 2 is a kind of flow chart of step S12 provided in an embodiment of the present invention；
Fig. 3 is the flow chart of another step S12 provided in an embodiment of the present invention；
Fig. 4 is the flow chart of another step S12 provided in an embodiment of the present invention；
Fig. 5 is the determination method of file copy amount in another distributed memory system provided in an embodiment of the present invention
Flow chart；
Fig. 6 is the knot of the determining device of file copy amount in a kind of distributed memory system provided in an embodiment of the present invention
Composition.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
Embodiment in invention, those of ordinary skill in the art are not under the premise of creative work is made, and what is obtained is every other
Embodiment, belongs to the scope of the present invention.
Core of the invention is to provide a kind of determination method and device of file copy amount in distributed memory system, uses
In the copy amount of file in reasonable setting system, the requirement of reliability can be met, will not cause larger to memory space again
Adverse effect.
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Fig. 1 is the stream of the determination method of file copy amount in a kind of distributed memory system provided in an embodiment of the present invention
Cheng Tu.As shown in figure 1, the determination method of file copy amount includes in distributed memory system：
S10：The grade separation and the corresponding reliability thresholds of each grade separation of each file that storage pre-builds.
S11：When copy storage request is got, the goal gradient point of the corresponding file of acquisition request is stored according to copy
Class is classified corresponding target reliabilities threshold value with determining goal gradient.
S12：Calculation of Reliability rule according to pre-building calculates the data section needed for reaching target reliabilities threshold value
The quantity of point.
Wherein, the parameter of Calculation of Reliability rule includes mean free error time, the quantity of back end of back end
With reliability time, the quantity of the back end of the copy amount of file for needed for.
It should be noted that in step S10, the grade separation and reliability thresholds of file can be according to the actual feelings of system
Depending on condition, not strict limitation.Quantity for grade separation can also be changed flexibly.As preferred embodiment,
Grade separation includes Three Estate, is respectively 99.99%, 99%, 95% according to the corresponding reliability thresholds of the rank of grade, such as
Shown in table 1.
Table 1
If the mean free error time of certain back end n is θnHour, then sent out in t hours future on this back end
The possibility of raw failure obeys exponential distributionThat is the reliability of this back end isThe reliability of file is depended on
The reliability of place back end.Assuming that there is once mistake for average every 10 days in the fault rate of certain back end, i.e.,So within 12 hours futures, the possibility that this back end breaks down is 1-e-0.00416=4.84%,
Reliability is e-0.00416=95.13%.
Accordingly, as one kind preferred embodiment, Calculation of Reliability rule is specially：
Wherein, as i=0, θ0It is that file is stored in back end n0On mean free error time, as i=1-k,
θ1-θkRepresent that the copy of file is respectively stored in back end n1-nkOn mean free error time, t represents the reliability time.
It should be noted that back end n0It is the back end for depositing file, and back end n1-nkOn be deposit file copy
Back end.Above formula is represented, in following t hours, the result of calculation of the reliability of file.
Deposit the main purpose of copy or the reliability of data in raising system, thus can be according to storage file can
Determine whether the copy amount of current file meets requirement by property attribute.For a unessential file, storage
If copy it is a lot, it is excessive to easily cause storage pressure, in addition, the reliability of some back end is very high, if will
Copy is stored in such back end, then the reliability of this document is just very high, and need not deposit too many copy.Equally
, the reliability for depositing the back end of copy is all very poor, then deposit again many copies, the reliability of this file or relatively low
's.Therefore, in the present embodiment, to deposit the reliability (mean free error time) and back end of the back end of copy
Quantity and to be parameter determine the reliability of file the reliability time, and then determine the copy amount of file storage.
Why choose above three parameter because, a reliability for file is directly proportional to copy amount, and average
Failure free time is directly proportional.That is, copy amount is more, file is safer；Back end reliability where copy is got over
Height, file is also safer.In the present embodiment, the copy amount not to file carries out unified regulation, but to file
Rating-type is divided, and specifies corresponding reliability thresholds.Therefore, the above method can not only ensure important file
Reliability is higher, and the copy of common file will not take too big memory space, can meet the requirement of reliability, and not
Larger adverse effect can be caused to memory space.
Illustrated with a simply example：If a critically important file, its grade is highest, reliability thresholds
It is 99.99%, after the copy of this file is stored on 10 back end, after being calculated according to Calculation of Reliability rule, hair
The reliability of existing this file is also not reaching to 99.99%, therefore, also need again to continue to deposit secondary on remaining other back end
This, until reaching 99.99%.For example, after the 15th back end deposits the copy of this file, the reliability of this file
Property reached 99.99%, then illustrate that the copy of this file only needs to this 15 back end storage, and do not need other
Back end is housed.If a common file, its grade is minimum, and reliability thresholds are 95%, by this file
After copy is archived on 5 back end, after being calculated according to Calculation of Reliability rule, it is found that the reliability of this file has reached
To 96%, exceed 95%, then illustrated that the copy of this file only needs to this 5 back end storages, and not need it
He houses back end.
It is emphasized that due to the reliability of file whether reach reliability thresholds and each back end itself can
It is related by property, if depositing copy with different back end, the result of calculation of possible reliability is different.Change sentence
Talk about, for reaching same reliability thresholds, the back end storage copy that 5 reliabilities may be selected higher, or
Person may select the relatively low back end storage copy of 10 reliabilities.If as choosing, follow-up embodiment will be by
One description.
The determination method of file copy amount is by the grade of file in the distributed memory system that the present embodiment is provided
What classification and two parameters of reliability thresholds were together decided on, be not that the copy amount of file carries out unified regulation.Therefore, should
Method can not only ensure that the reliability of important file is higher, and the copy of common file will not take too big storage sky
Between, the requirement of reliability can be met, larger adverse effect will not be caused to memory space again.
Fig. 2 is a kind of flow chart of step S12 provided in an embodiment of the present invention.As preferred embodiment, step S12
Specifically include：
S20：The copy of remaining any one back end storage file in selecting system.
S21：According to the current reliability of Calculation of Reliability rule calculation document.
S22：Whether current reliability is judged more than target reliabilities threshold value, if it is not, then S20 is returned, if it is, into
Step S23.
S23：The quantity of required back end is the quantity of the back end of storage copy in current system.
It is the selection that back end is realized according to the mode for randomly selecting in the present embodiment, it is to be understood that step S20
During remaining back end is current system in middle system, the back end of the copy without storage file or this document.Example
Such as, there are 15 back end, the 1st back end houses file, then remaining back end now in system is exactly the 2nd
Individual-the 15 back end, if the 2nd back end to be housed the copy of this document, now remaining in system
Back end is exactly the 3rd-the 15 back end, i.e., same back end does not repeat the related letter of storage same file
Breath, including file is in itself and copy.
Due to being the back end of any selection, therefore, it is possible to save the time of storage copy.It is contemplated that specific
In implementation, if arbitrary storage, the copy that this is likely to result in reliability back end storage high is less, and reliability is low
The copy of back end storage is more, then will certainly increase the quantity of copy.Therefore, in next embodiment will emphasis say
It is bright.
Fig. 3 is the flow chart of another step S12 provided in an embodiment of the present invention.As preferred embodiment, step
S12 is specifically included：
S30：In selecting system in remaining back end reliability highest node storage file copy.
S31：According to the current reliability of Calculation of Reliability rule calculation document.
S32：Judge current reliability whether more than target reliabilities threshold value；If it is not, then S30 is returned, if it is, entering
Enter S33.
S33：The quantity of required back end is the quantity of the back end of storage copy in current system.
In the present embodiment, according to reliability height as choose back end order, i.e., first choose reliability compared with
Back end high carries out the storage of copy, can so reduce the quantity of copy.
Fig. 4 is the flow chart of another step S12 provided in an embodiment of the present invention.As preferred embodiment, step
S12 is specifically included：
S40：In selecting system in remaining back end the minimum node storage file of load factor copy.
S41：According to the current reliability of Calculation of Reliability rule calculation document.
S42：Whether current reliability is judged more than target reliabilities threshold value, if it is not, then S40 is returned, if it is, entering
Enter S43.
S43：The quantity of required back end is the quantity of the back end of storage copy in current system.
In the present embodiment, according to load factor height as choose back end order, i.e., first choose load factor compared with
Low back end carries out the storage of copy, can so provide load-balancing performance, it is to avoid the storage of some back end has
Substantial amounts of copy, and some back end house little copy.
Fig. 5 is the determination method of file copy amount in another distributed memory system provided in an embodiment of the present invention
Flow chart.Step the present embodiment same as the previously described embodiments is repeated no more.As shown in figure 5, file in distributed memory system
Number of copies method for determination of amount also includes：
S50：The back end of the back end of record storage file and the copy of storage file.
Also include after step S50：
S51：The back end for breaking down and breaking down when any one back end is in the back end of record
When, then more new record.
Storage of the back end for the copy of each file in system can in time be obtained by step S50 and step S51
Situation.
The determination method of file copy amount in describing distributed memory system in detail in the various embodiments described above, together
When, the present invention also provides device corresponding with the above method.Due to the embodiment phase of embodiment and the method part of device part
The embodiment of mutually correspondence, therefore device part refers to the description of the embodiment of method part, wouldn't repeat here.Fig. 6 is this
The structure chart of the determining device of file copy amount in a kind of distributed memory system that inventive embodiments are provided.As shown in fig. 6,
Including：
Memory cell 10, grade separation and the corresponding reliability of each grade separation for storing each file for pre-building
Property threshold value；
Determining unit 11, for when copy storage request is got, the corresponding file of acquisition request being stored according to copy
Goal gradient classification classified corresponding target reliabilities threshold value with determining goal gradient；
Computing unit 12, target reliabilities threshold value institute is reached for being calculated according to the Calculation of Reliability rule for pre-building
The quantity of the back end for needing；
Wherein, the parameter of Calculation of Reliability rule includes mean free error time, the quantity of back end of back end
With reliability time, the quantity of the back end of the copy amount of file for needed for.
The determination method and device to file copy amount in distributed memory system provided by the present invention is carried out above
It is discussed in detail.Each embodiment is described by the way of progressive in specification, and what each embodiment was stressed is and it
The difference of his embodiment, between each embodiment identical similar portion mutually referring to.For being filled disclosed in embodiment
For putting, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is referring to method part
Illustrate.It should be pointed out that for those skilled in the art, not departing from the premise of the principle of the invention
Under, some improvement and modification can also be carried out to the present invention, these are improved and modification also falls into the protection of the claims in the present invention
In the range of.
Also, it should be noted that in this manual, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.And, term " including ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", does not arrange
Except also there is other identical element in the process including the key element, method, article or equipment.
Claims (9)
1. in a kind of distributed memory system file copy amount determination method, it is characterised in that including：
The grade separation and the corresponding reliability thresholds of each grade separation of each file that storage pre-builds；
When copy storage request is got, according to the copy store the goal gradient classification of the corresponding file of acquisition request with
Determine the corresponding target reliabilities threshold value of the goal gradient classification；
Calculation of Reliability rule according to pre-building calculates the back end needed for reaching the target reliabilities threshold value
Quantity；
Wherein, the parameter of the Calculation of Reliability rule includes mean free error time, the quantity of back end of back end
With reliability time, the quantity of the back end of the copy amount of the file for needed for.
2. in distributed memory system according to claim 1 file copy amount determination method, it is characterised in that institute
State the number that the back end needed for reaching the target reliabilities threshold value is calculated according to the Calculation of Reliability rule for pre-building
Amount is specifically included：
Remaining any one back end stores the copy of the file in selecting system；
The current reliability of the file is calculated according to Calculation of Reliability rule；
Judge current reliability whether more than the target reliabilities threshold value；
If it is not, then returning to the step that remaining any one back end in the selecting system stores the copy of the file
Suddenly；
If it is, the quantity of required back end be current system in store the copy back end quantity.
3. in distributed memory system according to claim 1 file copy amount determination method, it is characterised in that institute
State the number that the back end needed for reaching the target reliabilities threshold value is calculated according to the Calculation of Reliability rule for pre-building
Amount is specifically included：
Reliability highest node stores the copy of the file in remaining back end in selecting system；
The current reliability of the file is calculated according to Calculation of Reliability rule；
Judge current reliability whether more than the target reliabilities threshold value；
If it is not, then returning in the selecting system, reliability highest node stores the file in remaining back end
The step of copy；
If it is, the quantity of required back end be current system in store the copy back end quantity.
4. in distributed memory system according to claim 1 file copy amount determination method, it is characterised in that institute
State the number that the back end needed for reaching the target reliabilities threshold value is calculated according to the Calculation of Reliability rule for pre-building
Amount is specifically included：
The node that load factor is minimum in remaining back end in selecting system stores the copy of the file；
The current reliability of the file is calculated according to Calculation of Reliability rule；
Judge current reliability whether more than the target reliabilities threshold value；
If it is not, then returning to the node that load factor is minimum in remaining back end in the selecting system stores the file
The step of copy；
If it is, the quantity of required back end be current system in store the copy back end quantity.
5. in distributed memory system according to claim 1 file copy amount determination method, it is characterised in that institute
Calculation of Reliability rule is stated to be specially：
Wherein, as i=0, θ0It is that the file is stored in back end n0On mean free error time, as i=1-k,
θ1-θkRepresent that the copy of the file is respectively stored in back end n1-nkOn mean free error time, when t represents reliability
Between.
6. in distributed memory system according to claim 1 file copy amount determination method, it is characterised in that institute
Stating grade separation includes Three Estate, and 99.99%, 99%, 95% is respectively according to the corresponding reliability thresholds of the rank of grade.
7. in distributed memory system according to claim 1 file copy amount determination method, it is characterised in that also
Including：
The back end of the back end of the record storage file and the copy of the storage file.
8. in distributed memory system according to claim 7 file copy amount determination method, it is characterised in that also
Including：
When the back end that any one back end breaks down and breaks down is in the back end of record, then update
Record.
9. in a kind of distributed memory system file copy amount determining device, it is characterised in that including：
Memory cell, grade separation and the corresponding reliability of each grade separation for storing each file for pre-building
Threshold value；
Determining unit, for when copy storage request is got, the corresponding file of acquisition request being stored according to the copy
Goal gradient classifies to determine the corresponding target reliabilities threshold value of the goal gradient classification；
Computing unit, the Calculation of Reliability rule pre-build for basis is calculated needed for reaching the target reliabilities threshold value
Back end quantity；
Wherein, the parameter of the Calculation of Reliability rule includes mean free error time, the quantity of back end of back end
With reliability time, the quantity of the back end of the copy amount of the file for needed for.
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| CN107665258A (en) * | 2017-10-20 | 2018-02-06 | 北京小米移动软件有限公司 | File system availability determination method and device |
| CN108196985A (en) * | 2017-12-29 | 2018-06-22 | 中国电子科技集团公司信息科学研究院 | A kind of storage system failure prediction method and device based on intelligent predicting |
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