CN101217571A - Write/read document operation method applied in multi-copy data grid system - Google Patents
Write/read document operation method applied in multi-copy data grid system Download PDFInfo
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- CN101217571A CN101217571A CNA2008100563932A CN200810056393A CN101217571A CN 101217571 A CN101217571 A CN 101217571A CN A2008100563932 A CNA2008100563932 A CN A2008100563932A CN 200810056393 A CN200810056393 A CN 200810056393A CN 101217571 A CN101217571 A CN 101217571A
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Abstract
The invention discloses a method used for the document reading/writing operation of multi-copy data grid system, which belongs to the operational field of high speed document writing. The invention is characterized in that the following steps are sequentially included: the user puts forward a writing document request to the copy access client terminal; after the identity is successfully authenticated by a metadata server, a server distance comparison module selects a copy storage server that is nearest to the user in logic distance, and selects the corresponding copy view information, and after confirmed by a view analytical module of the copy access client side as effectiveness, a reading and writing execution module of the copy access client sends data writing request to the copy storage server; after the copy storage server successfully executes writing operation, a copy view updating module of the metadata updates the copy view. The invention leads the user to select the nearest copy storage server to execute writing operation, meanwhile, the normal reading operation of the user is guaranteed.
Description
Technical field
The present invention relates to the file operation in the data grids system, relate in particular to the high speed operating writing-file in the multi-copy data grid system.
Background technology
The data grids system extensively adopts the data trnascription technology to improve the performance of file operation, is about to a plurality of duplicates of the document and is stored in the different pieces of information node, comprising a rewritable primary copy file and a plurality of read-only wave file.For reading file operation, the user can select nearest wave file to carry out read operation by hand generally speaking, perhaps distributes the little wave file of communication-cost to carry out read operation by the Resource Scheduler in the data grids automatically for the user.For operating writing-file, generally be to write data in the primary copy file, the primary copy file is unique wave file of rewriting, the primary copy file will upgrade other read-only wave files automatically by synchronous or asynchronous system after upgrading and finishing.
From above-mentioned prior art as can be known, the operating writing-file in the present data grids has following deficiency:
Owing to can only rewrite the primary copy file, when the primary copy file storage is big to user's transport overhead, will reduce the performance of data grids operating writing-file.
When a certain file is frequently carried out write operation, overload may appear in the back end of storing this primary copy file, cause the performance of operating writing-file sharply to descend, even cause system crash.
Summary of the invention
The object of the present invention is to provide a kind of method that is used for the wave file of Writing/Reading nearby of multi-copy data grid system, this method makes the user carry out write operation to nearest wave file, has improved the performance of operating writing-file.
A kind of support that is used for multi-copy data grid system method of Writing/Reading wave file nearby relates to meta data server, copy storage server and copy access client.
Wherein meta data server comprises copy view memory module, copy view update module, server apart from comparison module, copy view selection module and error handling processing module, and the effect of each module is as follows:
Copy view memory module: stored copies view information, the full view information of describing a copy is made up of the data segment descriptor of the copy storage server address and the available copies of storing on described copy storage server, described data segment descriptor is represented that by start offset amount and data segment, length in copy described copy storage server address is represented by the domain name or the IP address of copy storage server;
Copy view update module: according to the concrete condition that copy upgrades, search and delete out-of-date copy view information, set up new copy view information, revise the data segment descriptor of copy view;
Server is apart from comparison module: estimate the logical reach of each copy storage server to the user who initiates read-write requests, the available bandwidth of the communication link between distance expression server far away more and the user is more little, and vice versa;
The copy view selection module: according to user's read-write requests, and described server is chosen copy view with described user distance minimum apart from the output result of comparison module; When the user read file operation, the minimum copy view of described distance may be put together by a plurality of data segments on a plurality of copy storage servers; When the user carried out operating writing-file, the minimum copy view of described distance was a data segment on the nearest copy storage server of distance users;
Wherein the copy storage server is responsible for storage, management wave file; Be responsible for reception and execution read-write operation from the user; Be responsible for the update mode of the wave file managed to the meta data server report;
The error handling processing module: when authentication is failed, recording exceptional, and to client transmission request failure response.
Wherein access client comprises user capture interface module, view request module, view parsing module, read-write Executive Module and fault processing module, and the effect of each module is as follows:
User capture interface module: receive the reading and writing of files request that the user sends;
The view request module: the output parameter according to the user capture interface module, send read-write requests to meta data server, obtain the required copy view information of concrete read-write operation;
Copy view parsing module: resolve the copy view information of returning by meta data server, server by the data segment place in the copy view information divides into groups to described copy view information, the data segment that is stored on the same server belongs to same group, and each data segment of same group is organized internal sort according to the start offset amount; For read operation, obtain each data segment data by the read-write Executive Module from relevant copy storage server, and form complete data segment and return to the user capture interface module; For write operation, user data is written in the corresponding data section of corresponding copy storage server by the read-write Executive Module;
The read-write Executive Module: mutual with the copy storage server, carry out the reading and writing of files operation;
Fault processing module: the mistake that is produced when handling the read-write view request and carrying out reading and writing of files.
Wherein carry out the method for operating writing-file by access client, implementation step is as follows successively:
Step (1). the user capture interface module of the copy access client of user in described system is submitted the written document request to,
This request comprises: the sign of institute's written document, the data that will write and the initial address side-play amount of institute's write data section and the length of data segment;
Step (2). after described user capture interface module is carried out simplified package to described written document request, be sent to the view request module of described copy access client, this view request module authentication module in the meta data server in described system is sent and is write view request;
Step (3). the authentication module of described meta data server is carried out simple authentication to the described view request of writing, if: unverified by authentication, then error message is issued error handling processing module in this meta data server, behind recording exceptional, the view parsing module in described system in the copy access client sends writes view request inefficacy response; If: by authentication, then correct information of authentication and user's the view request of writing is sent to server in this meta data server apart from comparison module, a copy storage server of the user's who initiates to write view request logical reach minimum is estimated and selected and leave to this server according to the domain name or the IP address of each copy storage server of storage in advance, apart from comparison module;
Step (4). the copy view selection module in the described meta data server is according to writing view request from described server apart from copy storage server and the user that comparison module obtains, in the copy view that copy view memory module from described meta data server is provided, choose the copy view, generate corresponding copy view information, and the result is returned to the view parsing module in the copy access client in the described system;
Step (5). the view parsing module of described copy access client receives that copy view information that the copy view selection module from described meta data server is returned or error handling processing module return writes view request and lost efficacy after the response, and whether check is effective view information; If the error handling processing module of this copy access client then issued error message by invalid view, and returns error message by described user capture interface module to the user; If effective view, then resolve described copy view information, according to the data segment place server in the copy view information described copy view information is divided into groups, make the data segment that is stored on the same server belong to same group, again each data segment of same group is organized internal sort by the size of the side-play amount of initial address, and the read-write Executive Module that group view information is sent in the described copy access client carries out concrete data writing operation; Step (6). the read-write Executive Module of described copy access client sends write data requests according to the group view information of receiving from described view parsing module to the copy storage server;
Step (7). the validity of the write data requests that the read-write Executive Module of the described copy storage server check of step (6) from described copy access client received; If the invalid data request, then the read-write Executive Module to described copy access client returns error message; If effectively request is then carried out data writing operation to the data copy, after writing successfully, the copy view update module of described copy storage server in described meta data server sends the copy updating record;
Step (8). after the copy view update module of the described meta data server of step (7) is received the copy updating record that obtains from the copy storage server, by the copy view memory module in the described meta data server copy view information of correspondence is upgraded operation, so that provide copy view accurately to described copy view selection module, if copy view update failure, then described copy view update module is returned copy to the described copy storage server of step (7) and is upgraded the failure confirmation, and then described copy storage server is rolled back to the state before the write operation, and sends the write data failure response to the read-write Executive Module of the described copy access client of step (6);
Step (9). if the described copy view update success of step (8), then the described copy view update of step (8) module is returned copy to the described copy storage server of step (7) and is upgraded successful confirmation, and this copy storage server sends the write data success response to the read-write Executive Module of the described copy access client of step (6);
Step (10). the read-write Executive Module of the described copy access client of step (6) is received after the write data response of the described copy storage server of step (7), response is judged to write data, if write data failure response, then error message is issued the error handling processing module of this copy access client, and returned error message to the user by described user capture interface module; If the write data success response is then returned the write data successful information to described view parsing module, this view parsing module returns the written document response by described user capture interface module to the user.
Wherein when described method is used for read operation, after authentication is passed through, by server apart from comparison module according to the logical reach Information Selection between described copy memory and the user and generate the corresponding view information of reading.
Wherein the user needs to obtain the handle of file before carrying out read-write operation, and after finishing all read-write operations, discharges the file handle that is obtained.
In sum, use method provided by the present invention can make the user can select nearest copy storage server to carry out write operation, guaranteeing simultaneously that the user can normally carry out reads file operation, improve the performance of file read-write operation, access client shields the read-write details in addition, thereby provides convenient file operation service for the user.
Description of drawings
Fig. 1 is system topological figure of the present invention;
Fig. 2 is the main modular composition frame chart of meta data server;
Fig. 3 is the main modular composition frame chart of access client;
Fig. 4 is the flow chart that the user carries out operating writing-file;
Fig. 5 is the flow chart that the user reads file operation.
Embodiment
To carry out the method implementation step of operating writing-file as follows for the access client of passing through among the present invention:
1, the user submits the written document request to the access interface module of the access client of access client, this request comprise institute's written document sign, to write as data and the start offset amount and the length of institute's write data section;
2, after the access interface module is carried out simplified package to the written document request, transfer to the view request module, the latter is to the required view information of meta data server request write operation;
3, meta data server carries out simple authentication to request, if unverified passing through then returns to the access client error message; If authentication is passed through, then change server over to apart from comparison module, estimate and select the copy storage server nearest with user distance;
4, find nearest copy storage server after, generate corresponding view information by the copy view selection module, and the result returned to access client;
5, the view parsing module of access client receives the view information that meta data server returns, and checks whether be effective view information, if be invalid view, then return to user's error message by the access interface module; If be effective view, then attempt sending write data requests by the read-write Executive Module to nearest copy storage server according to view information;
6, the check of copy storage server if be invalidation request, then returns to the access client error message from the validity of the write data requests of access client; If be effectively request, then carry out write operation; Writing successfully, back copy storage server sends the copy updating record to meta data server; If upgrade failure, then return to the access client error message, and be rolled back to the state before the write operation; If upgrade successfully, then notify access client;
If the failure of the write request of the view parsing module of 7 access client then returns to user's error message by the access interface module; If success then completes successfully by access interface module prompting user operating writing-file.
It is as follows wherein to read the implementation step of method of file operation by access client:
1, the user submits to the access interface module of the access client of access client and reads file request, and this request comprises the sign of the file of reading, the start offset amount and the length of the reading of data of wanting;
2, the access interface module is transferred to the view request module to after reading file request and carrying out simplified package, and the latter is to the required view information of meta data server request read operation;
3, meta data server carries out simple authentication to request, if unverified passing through then returns to the access client error message; If authentication is passed through, then change server over to apart from comparison module, estimate the distance between copy storage server and the user, and change the copy view selection module over to and handle;
4, the copy view selection module is selected to generate corresponding view information according to the range information that is obtained apart from comparison module by server, and the result is returned to access client;
5, the view parsing module of access client receives the view information that meta data server returns, and checks whether be effective view information, if be invalid view, then return to user's error message by the access interface module; If be effective view, then attempt sending read data request by the read-write Executive Module to one or more copy storage servers according to view information;
6, the check of copy storage server if be invalidation request, then returns to the access client error message from the validity of the read data request of access client; If be effectively request, then carry out read operation, the data that read are returned to access client;
If the failure of the read request of the view parsing module of 7 access client then returns to user's error message by the access interface module; If success, then the data segment that all are returned is assembled into the data segment of finishing that the user asks, and returns to the user by the access interface module.
Below in conjunction with accompanying drawing concrete enforcement of the present invention is described in further detail.
Fig. 1 is that the network of concrete enforcement data grids of the present invention system is formed topological diagram, this figure is made up of with access client 2 two large divisions server group 1, wherein the server group is made of meta data server 3 and a plurality of copy storage servers 4, and wherein meta data server 3 links to each other with copy storage server 4.Access client 2 links to each other with copy storage server 4 with meta data server 3, and the read-write operation of client was made up of two stages, at first be and meta data server between metadata operation, be then and the copy storage server between data manipulation.
As shown in Figure 2, wherein meta data server is made of 6 modules, is respectively: copy view update module 10, copy view memory module 11, authentication module 12, server are apart from comparison module 13, copy view selection module 14, error handling processing module 15.
The effect of each module is as follows:
Copy view update module 10: receive copy updating record from the copy storage server, search and delete out-of-date copy view information, set up new copy view information, revise the data segment descriptor of copy view, and send the renewal affirmation to the copy storage server.
Copy view memory module 11: the stored copies view information, and provide the view query service for other modules.The full view information of describing a copy is made up of the data segment descriptor of the copy storage server address and the available copies of storing on described copy storage server, described data segment descriptor is represented that by start offset amount and data segment, length in copy described copy storage server address is represented by the domain name or the IP address of copy storage server.
Authentication module 12: user's read-write view request is carried out handling based on the authentication of file handle, judge promptly whether the file handle that is provided in the request is the file handle of validated user.
Server is apart from comparison module 13: estimate the logical reach of each copy storage server to the user who initiates read-write requests, the available bandwidth of the communication link between distance expression server far away more and the user is more little, and vice versa.
Copy view selection module 14: according to user's read-write requests, and described server is chosen copy view with described user distance minimum apart from the output result of comparison module; When the user read file operation, the minimum copy view of described distance may be put together by a plurality of data segments on a plurality of copy storage servers; When the user carried out operating writing-file, the minimum copy view of described distance was a data segment on the nearest copy storage server of distance users.
Error handling processing module 15: when authentication is failed, recording exceptional, and to client transmission request failure response.
As shown in Figure 3, wherein access client is made up of user capture interface module 200, view request module 201, view parsing module 202, read-write Executive Module 203 and fault processing module 204 5 parts.
The effect of each module is as follows:
User capture interface module 200: receive the reading and writing of files request that the user sends, and execution result is returned to the user.
View request module 201: according to the output parameter of user capture interface module, send the read-write view request, obtain the required copy view information of concrete read-write operation to meta data server.
Copy view parsing module 202: resolve the copy view information of returning by meta data server, server by the data segment place in the copy view information divides into groups to described copy view information, the data segment that is stored on the same server belongs to same group, and each data segment of same group is organized internal sort according to the start offset amount; For read operation, obtain each data segment data by read-write Executive Module 203 from relevant copy storage server, and form complete data segment and return to user capture interface module 201; For write operation, user data is written in the corresponding data section of corresponding copy storage server by read-write Executive Module 203.
Read-write Executive Module 203: mutual with the copy storage server, carry out the reading and writing of files operation.
Fault processing module 204: the mistake that is produced when handling the read-write view request and carrying out reading and writing of files.
Figure 4 shows that the user carries out the flow chart of operating writing-file, in access client, carry out simplified package by 200 couples of users' of user capture interface written document request in the step 300, forward in the step 310 by view request module 201 to the required view information of meta data server request write operation; In meta data server, by authentication module user's view request is carried out authentication in the step 320, if in step 330, pass through authentication, then forward in the step 340 by server and estimate apart from comparison module 13 and select the copy storage server nearest with user distance, and forward in the step 350 and to generate view information by copy view selection module 14 and send to access client, if in step 330,, then forward in the step 360 and send to the access client error reporting by error handling processing module 15 not by authentication; In access client, the view that is received from the metadata service by view parsing module 202 in the step 370 responds, if view is invalid view information in step 380, then forward in the step 440 and carry out fault processing by fault processing module 204, and forward step 450 to and write failure by user capture interface 200 prompting users, if judge that in step 380 view is effective view, then forward in the step 390 and initiate to write the request of execution to the copy storage server by writing Executive Module 203; In the copy storage server, step 400 check is from the validity of writing the request of execution of access client, if be invalidation request, then return to the access client error message and forward step 420 to, if be effectively request, then carry out write operation, send the copy updating record to meta data server, and in step 410, upgrade by 10 pairs of copy views of copy view update module of meta data server, finish and upgrade the back and in step 400, send and write execution result to access client; In access client, in the step 420 by writing the execution result of writing that Executive Module 203 receives the copy storage servers, in step 430, judge whether successfully to write execution, if success then forward in the step 450 and return user's write response to the user by user capture interface 200, if judge in the step 430 to write and carry out failure, then forward in the step 440 and carry out fault processing, and forward step 450 to and write failure by user capture interface 200 prompting users by fault processing module 204.
Fig. 5 reads the flow chart of file operation for the user, in access client, carry out simplified package by 200 couples of users' of user capture interface the file request of reading in the step 500, forward in the step 510 by view request module 201 to the required view information of meta data server request read operation; In meta data server, by authentication module user's view request is carried out authentication in the step 520, if in step 530, pass through authentication, then forward the distance of estimating between each copy storage server and the user apart from comparison module 13 by server in the step 540 to, and forward in the step 550 range information of estimating according to step 540 by copy view selection module 14 to and generate view information and send to access client, if in step 530,, then forward in the step 560 and send to the access client error reporting by error handling processing module 15 not by authentication; In access client, the view that is received from the metadata service by view parsing module 202 in the step 570 responds, if view is invalid view information in step 580, then forward in the step 620 and carry out fault processing by fault processing module 204, and forward step 650 to and write failure by user capture interface 200 prompting users, if judge that in step 580 view is effective view, then forward in the step 590 by read the copy storage server initiation read data request that Executive Module 203 relates in view; In the copy storage server, step 600 check is from the validity of reading the request of carrying out of access client, if be invalidation request, then return to the access client error message and forward step 610 to, if be effectively request, then carry out the read data operation, and send the read data result to access client; In access client, in the step 610 by reading the read data result that Executive Module 203 receives the copy storage servers, judge in step 610 whether read data is successful, if success then forward in the step 640 and according to view information the data that read are carried out amalgamation by the view parsing module, after whole view amalgamation is finished, forward in the step 650 and to return the user by user capture interface 200 to the user and read response, if judge the read data failure in the step 610, then forward in the step 620 and carry out fault processing, and forward step 650 to by user capture interface 200 prompting user reading failures by fault processing module 204.
Claims (2)
1. a method that is used for the operating writing-file of multi-copy data grid system is characterized in that, implementation step is as follows successively:
Step (1). the user capture interface module of the copy access client of user in described system is submitted the written document request to, and this request comprises: the sign of institute's written document, the data that will write and the initial address side-play amount of institute's write data section and the length of data segment;
Step (2). after described user capture interface module is carried out simplified package to described written document request, be sent to the view request module of described copy access client, this view request module authentication module in the meta data server in described system is sent and is write view request;
Step (3). the authentication module of described meta data server is carried out simple authentication to the described view request of writing, if: unverified by authentication, then error message is issued error handling processing module in this meta data server, behind recording exceptional, the view parsing module in described system in the copy access client sends writes view request inefficacy response; If: by authentication, then correct information of authentication and user's the view request of writing is sent to server in this meta data server apart from comparison module, a copy storage server of the user's who initiates to write view request logical reach minimum is estimated and selected and leave to this server according to the domain name or the IP address of each copy storage server of storage in advance, apart from comparison module;
Step (4). the copy view selection module in the described meta data server is according to writing view request from described server apart from copy storage server and the user that comparison module obtains, in the copy view that copy view memory module from described meta data server is provided, choose the copy view, generate corresponding copy view information, and the result is returned to the view parsing module in the copy access client in the described system;
Step (5). the view parsing module of described copy access client receives that copy view information that the copy view selection module from described meta data server is returned or error handling processing module return writes view request and lost efficacy after the response, and whether check is effective view information; If the error handling processing module of this copy access client then issued error message by invalid view, and returns error message by described user capture interface module to the user; If effective view, then resolve described copy view information, according to the data segment place server in the copy view information described copy view information is divided into groups, make the data segment that is stored on the same server belong to same group, again each data segment of same group is organized internal sort by the size of the side-play amount of initial address, and the read-write Executive Module that group view information is sent in the described copy access client carries out concrete data writing operation;
Step (6). the read-write Executive Module of described copy access client sends write data requests according to the group view information of receiving from described view parsing module to the copy storage server;
Step (7). the validity of the write data requests that the read-write Executive Module of the described copy storage server check of step (6) from described copy access client received; If the invalid data request, then the read-write Executive Module to described copy access client returns error message; If effectively request is then carried out data writing operation to the data copy, after writing successfully, the copy view update module of described copy storage server in described meta data server sends the copy updating record;
Step (8). after the copy view update module of the described meta data server of step (7) is received the copy updating record that obtains from the copy storage server, by the copy view memory module in the described meta data server copy view information of correspondence is upgraded operation, so that provide copy view accurately to described copy view selection module, if copy view update failure, then described copy view update module is returned copy to the described copy storage server of step (7) and is upgraded the failure confirmation, and then described copy storage server is rolled back to the state before the write operation, and sends the write data failure response to the read-write Executive Module of the described copy access client of step (6);
Step (9). if the described copy view update success of step (8), then the described copy view update of step (8) module is returned copy to the described copy storage server of step (7) and is upgraded successful confirmation, and this copy storage server sends the write data success response to the read-write Executive Module of the described copy access client of step (6);
Step (10). the read-write Executive Module of the described copy access client of step (6) is received after the write data response of the described copy storage server of step (7), response is judged to write data, if write data failure response, then error message is issued the error handling processing module of this copy access client, and returned error message to the user by described user capture interface module; If the write data success response is then returned the write data successful information to described view parsing module, this view parsing module returns the written document response by described user capture interface module to the user.
2. the method that is used for the operating writing-file of multi-copy data grid system according to claim 1, it is characterized in that when described method is used for read operation, after authentication is passed through, by server apart from comparison module according to the logical reach Information Selection between described copy memory and the user and generate corresponding view information.
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| US7200623B2 (en) * | 1998-11-24 | 2007-04-03 | Oracle International Corp. | Methods to perform disk writes in a distributed shared disk system needing consistency across failures |
| US6918013B2 (en) * | 2001-07-16 | 2005-07-12 | Bea Systems, Inc. | System and method for flushing bean cache |
| CN100386986C (en) * | 2006-03-10 | 2008-05-07 | 清华大学 | Hybrid positioning method for data duplicate in data network system |
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