CN102750391A - File previewing method and system based on Hadoop distribution type - Google Patents
File previewing method and system based on Hadoop distribution type Download PDFInfo
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Abstract
The invention provides a file previewing method based on Hadoop distribution type. The file previewing method comprises the following steps of: step 1), storing a source file in a Hadoop distribution type file system; step 2), converting the source file stored in the Hadoop distribution type file system into an SWF (Small Web Format) file and a text file; step 3), carrying out index extraction on the text file and establishing index; and step 4), reading the SWF file needing to be previewed and displayed from the Hadoop distribution type storage according to the index so as to carry out playing. The invention also provides a file previewing system based on Hadoop distribution type. By the file previewing method and the system provided by the invention, the timeliness for simultaneous conversion processing of large and multiple files is obviously improved, and the conversion processing capability and the index searching capability of the mass files as well as the smoothness of played and previewed files are enhanced.
Description
Technical field
The present invention relates to computer realm, particularly relate to a kind of file method for previewing and system.
Background technology
The file preview is meant the file with certain format, like the Office of Microsoft file, pdf document, text and some picture files, under file editor's situation, is showing file content.Existing file preview mode mainly contains preview based on webpage, based on the Quick Look of the browsing of thumbnail, Apple with based on the preview of Flash.
Be meant that based on browsing of webpage converting file content into html format shows, its shortcoming is to lose file layout information.Based on browsing of thumbnail is that file content is generated picture by page or leaf, checks to scheme sheet mode, and its shortcoming is to carry out searching of text.The QuickLook technology is a kind of file preview mode in a kind of Mac of the being used in OSX system, and shortcoming is to be used for Mac OSX system, and does not also support file content to search.Based on the file preview of Flash is to be the SWF file layout with file conversion, and in webpage, embeds the SWF player and carry out viewing files.The file preview of this solution is based on the Flash technology.
Above-mentioned file preview solution only has been directed against the conversion of file layout and the preview of file, but has following problem: to the problem of ageing, the mass file retrieval of file reliability, mass file conversion.
When handling big file or multifile simultaneously, change ageing and efficient is lower;
When there was mass file in system, document retrieval efficient was low;
The playblast file is not smooth under slow speed network or the big situation of file, influences user experience.
So, be necessary to propose a kind of new technical scheme, to solve the problem of ageing, the mass file retrieval that improves file reliability, mass file conversion when the file preview.
Summary of the invention
The object of the present invention is to provide a kind of based on Hadoop distributed document method for previewing and system thereof; Make and handle ageing being significantly improved of big file multifile conversion simultaneously; Enhanced system mass file conversion process ability and magnanimity indexed search ability, and can be implemented under the big situation of slow speed network or file still the effectively fluency of maintenance customer's experience through paging playblast file.
For solving following technical matters, it is a kind of based on Hadoop distributed document method for previewing that the present invention provides, and comprising:
Step 1, source file is stored in the Hadoop distributed file system;
Step 2, the source file that will be stored in the Hadoop distributed file system convert SWF file and TXT file to;
Step 3, will convert text into and carry out index and extract, set up index;
Step 4, from the Hadoop distributed storage, read the SWF file that the needs preview shows according to index and play.
Further, said step 2 specifically comprises:
Step 2.1, obtain the source file that is stored in the Hadoop distributed file system;
Step 2.2, convert source file to pdf document;
Step 2.3, the pdf document form is extracted the plain text content, save as text;
Step 2.4, convert pdf document into the SWF file.
Step 2.5, text and SWF file layout after will changing are successfully deposited back in the Hadoop distributed storage.
Further, said step 3 specifically comprises:
Step 3.1, in the Hadoop distributed storage, set up index list;
Step 3.2, will convert text-only file into and carry out index and extract and to set up index;
Step 3.3, will set up good index and write and merge in the Hadoop index list.
Further, said step 4 specifically comprises:
Step 4.1, from the Hadoop distributed storage, read the SWF file that the needs preview is showed according to index;
Step 4.2, with the SWF file load that reads to file preview player plays.
For solving following technical matters, it is a kind of based on Hadoop distributed document prebrowsing system that the present invention also provides, and comprising: file storage device, file conversion device, file index device, file pre-viewing device,
Said file storage device is used to store source file to be converted, and successful text and the SWF file of conversion;
Said file conversion device is used for converting source file into text-only file form and SWF form;
Said file index device will convert text-only file into and carry out index and extract and to set up index;
Said file pre-viewing device is used for playing the SWF file that the needs preview is showed according to index.
Further, said file storage device is based in the Hadoop distributed file system, and True Data is stored on the Hadoop data node.
Further, said file conversion device comprises convert task scheduler, convert task actuator,
Said convert task scheduler is used to the convert task of presenting a paper, and convert task is dispatched said convert task actuator;
Said convert task actuator is used to carry out the file conversion task that the convert task scheduler is distributed.
Further, said convert task scheduler is based on Hadoop MapReduce and realizes, the said convert task actuator of the conversion Map task scheduling of will presenting a paper.
Further, said convert task actuator comprises: file conversion task finger daemon, OpenOffice service and SWFTools,
Said file conversion task finger daemon is used for after receiving the file conversion task, this convert task being saved in the disk, guards the file conversion progress and accomplishes until the file conversion task;
Said OpenOffice service is used for converting the file layout that OpenOffice supports to pdf document;
Said SWFTools is used for converting pdf document into the SWF file.
Further, said file pre-viewing device is based on the Flash player, can directly from the Hadoop distributed storage, read the SWF file that needs preview to show.
Compared with prior art, provided by the invention a kind of based on Hadoop distributed document method for previewing and system thereof, have following technological merit:
One, through Hadoop mass memory and distributed task management platform; Task scheduling mode with every Hadoop MapReduce is carried out; Utilize the Hadoop cluster to carry out the file conversion task, let simultaneously big ageing being significantly improved of file multifile conversion process, file conversion efficient is high; Simultaneously with file storage in the Hadoop distributed storage; File can not damage, and guarantees the validity and the redundancy of file, still can normally carry out to reach under the situation that has many cluster nodes to break down conversion work.
Two, aspect file index, index is set up and is adopted distributed many nodes to carry out, and carries out file index by file finger daemon cluster and sets up, and index divides the two-stage storage, and one-level is arranged in the Hadoop distributed storage, and one-level is arranged in file finger daemon internal memory; Adopt the distributed search mode, return the internal memory index that the All Files finger daemon safeguarded and carry out search index, effectively promote the index inquiry velocity.
Three, through improvement to Hadoop task manager and traditional SWF player; Make system reach mass file conversion process ability and magnanimity indexed search ability, and can be implemented under the big situation of slow speed network or file still the effectively fluency of maintenance customer's experience through paging playblast file.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes a part of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, does not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is provided by the invention a kind of based on Hadoop distributed document prebrowsing system structural representation.
Fig. 2 is a kind of process flow diagram based on Hadoop distributed document method for previewing provided by the invention.
Fig. 3 is the process flow diagram of the concrete transfer process of file provided by the invention.
Fig. 4 is a process flow diagram of setting up file index provided by the invention.
Embodiment
In order to make technical matters to be solved by this invention, technical scheme and beneficial effect clearer, clear,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 1, it is a kind of based on Hadoop distributed document prebrowsing system that the present invention provides, and comprising: file storage device 10, file conversion device 20, file index device 30, file pre-viewing device 40.
File storage device 10 is used to store source file to be converted, and successful plain text TXT file and the SWF file of conversion.Wherein, file storage device is based in the Hadoop distributed file system, and True Data is stored on the Hadoop data node.The file layout of file storage device 10 storages will carrying out preview is described below:
Source file format: source file format promptly needs the file layout of preview at first, and this file layout can be the Office of Microsoft file layout, pdf document form, GIF/PNG/JPEG picture format and text-only file file layout.
Plain text TXT form: plain text format is meant the plain text content in the file, and no form, no chart do not have concrete file layout information yet, and plain text format is used for file index device 30 and sets up index and retrieval.
The SWF file layout: the SWF file layout is the file layout that file pre-viewing device 40 is supported, the file of changing for needs can be divided into N SWF file, and N can manual configuration.These SWF formatted files can discerned and load to file pre-viewing device 40, thereby reach the preview to source document.
File conversion device 20 is used for converting source file into text-only file form and SWF form.File conversion device 20 comprises: convert task scheduler, convert task actuator.Wherein,
The convert task scheduler is based on Hadoop MapReduce and realizes, through the conversion Map task of presenting a paper, convert task is dispatched to execute file convert task on the data node of file storage device 10.The convert task scheduler only is responsible for scheduler task and is distributed, and concrete convert task is carried out by the convert task actuator.
The convert task actuator is to carry out the file conversion task that the convert task scheduler is distributed.Comprise: file conversion task finger daemon, OpenOffice service and SWFTools.Wherein, File conversion task finger daemon is after receiving the file conversion task; This convert task is saved in the disk, guards the file conversion progress and accomplish, so that after accidental shutdown event takes place in system, still can carry out the not file of successful conversion until the file conversion task.The OpenOffice service is to realize forwarding the file layout that OpenOffice supports to the pdf document form.SWFTools is a kind of crossover tool, is used for converting pdf document into the SWF file.
File index device 30, index are set up based on Lucene and are realized, will convert text-only file into and carry out index and extract and set up index, and will set up the index stores of getting well in the Hadoop distributed file system.
Search index is based on Lucene distributed index Retrieval Interface; Each file conversion task finger daemon also provides an indexed search service; Formed a plurality of search index ISPs by a lot of file conversion finger daemons like this, these index service provide that the index of all in store file of oneself having changed is up-to-date to be backed up in internal memory.When the indexed search operation takes place when, all movable index service suppliers of training in rotation, retrieval obtains this indexed results.
File pre-viewing device 40 is used for playing the SWF file that the needs preview is showed according to index, and file pre-viewing device 40 can directly read the SWF file that needs preview to show based on the Flash player from the Hadoop distributed storage.Can reach cross-platform file preview like this.
As shown in Figure 2, it is a kind of based on Hadoop distributed document method for previewing that the present invention provides, and comprising:
Step 1, file storage are stored in source file in the Hadoop distributed file system.
Step 2, file conversion convert the source file that is stored in the Hadoop distributed file system to text and SWF file.Concrete transfer process comprises (as shown in Figure 3):
Step 2.1, obtain the source file that is stored in the Hadoop distributed file system, specifically comprise:
Step 2.1.1, startup and configuration transitions environment mainly comprise starting the Hadoop cluster environment, dispose OpenOffice and SWFTools to Hadoop data node.
Step 2.1.2, by Hadoop task node startup file convert task finger daemon, mainly be through submitting Hadoop MapReduce task to, MapReduce task herein has only the Map process not have the Reduce process.
Step 2.1.3, submission Hadoop MapReduce file conversion task; This task also only is made up of the Map process; Purpose is that the Hadoop task node of carrying out this task communicates by letter with file conversion task finger daemon, submits to the task metamessage in file conversion task finger daemon.
Step 2.1.4, file conversion task finger daemon add work queue with the file conversion task, carry out the file conversion task.
Step 2.2, convert source file to pdf document, specifically comprise:
Call OpenOffice and realize forwarding the file layout that OpenOffice supports to the pdf document form, wherein, if file be the pdf document form then need do not changed, directly skip this step and arrive next step;
Step 2.3, the pdf document form is extracted the plain text content, save as the TXT file.Specifically comprise:
Utilize PDFBox that the content extraction in the PDF file is the plain text content, save as the TXT file.
Step 2.4, convert pdf document into the SWF file, specifically comprise:
Convert the pdf document form into the SWF file by every N page mode with crossover tool SWFTools, so that the file previewer can preview file.
Step 2.5, TXT file and SWF file layout after will changing are successfully deposited back in the Hadoop distributed storage.
Step 3, file index will convert text-only file into and carry out the index extraction, set up index, and will set up good index stores in the Hadoop distributed file system.Specifically comprise (as shown in Figure 4):
Step 3.1, when startup file convert task finger daemon, need be used as the part of index stores among the initialization Hadoop, mainly be in the Hadoop distributed storage, to set up index list for each file, and directory name is the IP address.
Step 3.2, will convert text-only file into and carry out index and extract and to set up index, and adopt the Lucene Java that increases income to realize that index sets up in the embodiment of the invention.
Step 3.3, will set up good index and write and merge in the Hadoop index list, and refreshing file convert task finger daemon internal memory index, up-to-date index content and consistent reflected with the internal memory index with Hadoop index list file content.
Step 4, file preview are read the SWF file of needs preview displaying and are play from the Hadoop distributed storage according to index.Specifically comprise:
Step 4.1, according to file index, from the Hadoop distributed storage, read the metadata information that needs the SWF file that preview shows.
Step 4.2, the metadata information that reads is formed load page be loaded into file preview player plays by paging mode.
Above-mentioned explanation illustrates and has described a preferred embodiment of the present invention; But as previously mentioned; Be to be understood that the present invention is not limited to the form that this paper discloses, should do not regard eliminating as, and can be used for various other combinations, modification and environment other embodiment; And can in invention contemplated scope described herein, change through the technology or the knowledge of above-mentioned instruction or association area.And change that those skilled in the art carried out and variation do not break away from the spirit and scope of the present invention, then all should be in the protection domain of accompanying claims of the present invention.
Claims (10)
1. one kind based on Hadoop distributed document method for previewing, it is characterized in that, comprising:
Step 1, source file is stored in the Hadoop distributed file system;
Step 2, the source file that will be stored in the Hadoop distributed file system convert SWF file and TXT file to;
Step 3, will convert text into and carry out index and extract, set up index;
Step 4, from the Hadoop distributed storage, read the SWF file that the needs preview shows according to index and play.
2. the method for claim 1 is characterized in that, said step 2 specifically comprises:
Step 2.1, obtain the source file that is stored in the Hadoop distributed file system;
Step 2.2, convert source file to pdf document;
Step 2.3, the pdf document form is extracted the plain text content, save as text;
Step 2.4, convert pdf document into the SWF file.
Step 2.5, text and SWF file layout after will changing are successfully deposited back in the Hadoop distributed storage.
3. the method for claim 1 is characterized in that, said step 3 specifically comprises:
Step 3.1, in the Hadoop distributed storage, set up index list;
Step 3.2, will convert text-only file into and carry out index and extract and to set up index;
Step 3.3, will set up good index and write and merge in the Hadoop index list.
4. the method for claim 1 is characterized in that, said step 4 specifically comprises:
Step 4.1, from the Hadoop distributed storage, read the SWF file that the needs preview is showed according to index;
Step 4.2, with the SWF file load that reads to file preview player plays.
5. one kind based on Hadoop distributed document prebrowsing system, it is characterized in that, comprising: file storage device, file conversion device, file index device, file pre-viewing device,
Said file storage device is used to store source file to be converted, and successful text and the SWF file of conversion;
Said file conversion device is used for converting source file into text-only file form and SWF form;
Said file index device will convert text-only file into and carry out index and extract and to set up index;
Said file pre-viewing device is used for playing the SWF file that the needs preview is showed according to index.
6. system as claimed in claim 5 is characterized in that, said file storage device is based in the Hadoop distributed file system, and True Data is stored on the Hadoop data node.
7. system as claimed in claim 5 is characterized in that, said file conversion device comprises convert task scheduler, convert task actuator,
Said convert task scheduler is used to the convert task of presenting a paper, and convert task is dispatched said convert task actuator;
Said convert task actuator is used to carry out the file conversion task that the convert task scheduler is distributed.
8. system as claimed in claim 7 is characterized in that, said convert task scheduler is based on Hadoop MapReduce and realizes, the said convert task actuator of the conversion Map task scheduling of will presenting a paper.
9. system as claimed in claim 7 is characterized in that, said convert task actuator comprises: file conversion task finger daemon, OpenOffice service and SWFTools,
Said file conversion task finger daemon is used for after receiving the file conversion task, this convert task being saved in the disk, guards the file conversion progress and accomplishes until the file conversion task;
Said OpenOffice service is used for converting the file layout that OpenOffice supports to pdf document;
Said SWFTools is used for converting pdf document into the SWF file.
10. system as claimed in claim 5 is characterized in that, said file pre-viewing device is based on the Flash player, can directly from the Hadoop distributed storage, read the SWF file that needs preview to show.
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Application publication date: 20121024 |