CN104410655A - Named mechanism based storage system and method of distributed network - Google Patents
Named mechanism based storage system and method of distributed network Download PDFInfo
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Abstract
The present invention discloses a named mechanism based storage system and method of distributed network. The system is a flattening distributed data storage system that: the framework of the network level node is the same as that of the storage level node; a local data processing, an external request processing, and an external named data return processing are performed based on the node framework; and named data block is uniformly designed on the network level and the storage level. The system refers to the design of the named data networking (Named Data Networking NDN), and combined the NDN with the storage mechanism of the file system to form a novel distributed storage system architecture.
Description
Technical field
The present invention relates to computer distributed system design field, be specifically related to a kind of storage system and method for the distributed network based on naming mechanism.
Background technology
Based on the Internet of TCP/IP network architecture, achieve huge success up to now, complete global information interconnection and intercommunication, promote the overall salary strategy in the world.Current TCP/IP architecture originates from the network that Advanced Study Project management board of U.S. Department of Defense in 1969 starts the ARPAnet by name set up, and its objective is and only links up by several military affairs of the U.S. and research host computer.The most original purpose of design in the Internet that is to say the communication of guarantee two machine point-to-points.But along with the development of the Internet requirement and application, current the Internet communicates from point to points gradually to large-scale contents distribution and changes.
Current the Internet also exposes subject matter: on network, the content of 99% is the block of information with name, these information are not only by great institutions (large video website, news portal etc.) produce, terminal use also produces a large amount of block of information gradually, and the Internet has become block of information consumption and the carrier issued.Current TCP/IP framework is mainly the ad hoc mode of host-to-host, is unfavorable for issue and the diffusion of information.For ambulant support, IP network is undesirable what also do the support arranged with mobile device IP.
In large data age, how to transmit and process the difficult problem that large-scale data Shi Ge great IT company faces efficiently.Current distributed system mainly adopts the pattern of large-scale computer cluster to replace traditional giant computer pattern.The Google whole world has hundreds of thousands station server altogether, per minutely accepts altogether several ten million search in the whole world, and carries out quick-searching within one second and response to data.In a distributed system, a crucial problem carries out unified management and access for the data being distributed in each main frame.How the metadata of mass data carries out efficient index and management, and how the data between machine are effectively transmitted.
In distributed mass data storage system, flow main in network is exactly the transmission of named data block.Traditional Distributed Cluster generally adopts the distributed file system (GFS of such as google) on existing generic-document system (such as ZFS file system), and network level generally adopts the network based on ICP/IP protocol.Much unnecessary redundancy can be produced like this in whole distributed file system:
First, in file system aspect, the Main Function of file system is carry out index management to the data block that storage medium stores, and distributed file system, in global level, soon secondary management is carried out to these named datas.At network level, in file system, data by stripping and slicing again, and can increase the data of description of host address IP.At receiving terminal, the packet of chopping also can be become data block by from Combination nova.Cause the basic reason of these redundancies to be the design mechanism be separated with file system because of network, cause in different aspects, for same data block, there is different description mechanism.
Summary of the invention
For the problems referred to above, the invention provides a kind of distributed network storage system and the data processing method that network data and local data are stored in the naming mechanism on a storage list in each network node.
For achieving the above object, the present invention is based on the distributed network storage system of naming mechanism, each network node at least comprises local and network element tables of data, and described this locality and network element tables of data at least comprise title prefix entries, network interface address list item and local address list item;
Wherein, described title prefix entries stores the title prefix of named data;
Described network interface address list item stores the network interface address of named data;
Described local address list item stores the local address of named data.
Further, described network node also comprises content caching table and request wait list, wherein,
Described data cached table stores the named data of this target node;
Described wait required list stores the request data package that this network node receives.
For achieving the above object, the present invention is based on the distributed network storage means of naming mechanism, each network node at least comprises local and network element tables of data, described this locality and network element tables of data at least comprise title prefix entries, network interface address list item and local address list item, wherein, described title prefix entries stores the title prefix of named data, described network interface address list item stores the network interface address of named data, and described local address list item stores the local address of named data;
Described method at least comprises:
Receiving package contains the request bag of the title prefix of named data;
Request bag described in described this locality and network element tables of data respond, wherein response method comprises:
The title prefix of the named data title prefix in described request bag stored with described title prefix entries is mated,
If there is occurrence, then search should the network interface address of named data of title prefix and/or local address at described network interface address list item and/or described local address list item;
Based on lookup result by should the named data of title prefix be back to described request bag send node;
If without occurrence, then do not process.
Particularly, described in network interface address list item described in described network interface address list item and/or described local address list item, search this named data network interface address and/or local address, concrete steps comprise:
Judge whether described network interface address list item and local address list item search priority,
If there is priority, then search in the list item that priority is high based on priority;
If there is no priority, then Network Search interface entry and local address list item while.
Particularly, described based on lookup result by should the named data of title prefix be back to described request bag send node, concrete steps comprise:
If find the network interface address of network naming data in network interface list item, then the described request bag of reception is sent to described network interface address, this network interface address returns corresponding named data, exports this named data and sends node to described request bag;
If find network naming data in local address list item, then export this named data and send node to described request bag;
If find in network interface list item and local address list item simultaneously, then the priority exported based on result exports corresponding named data by network interface address list item or local address list item.
Further, described network node also comprises content caching table and request wait list, and described method also comprises:
The request bag request of reception is joined request in wait list;
Content caching table response request bag, wherein response method is: search in described data cached table the title prefix that whether there is the named data title prefix that contains with described request handbag and match,
If exist, then what this named data is sent to described request bag sends node, and waits for request accordingly in deletion wait required list;
If do not exist, then search local with network element tables of data in whether exist wrap with request in the title prefix that matches of title prefix,
If exist, then described this locality and network element tables of data response request bag, and in removal request wait list, ask bag accordingly;
If do not exist, then do not process.
The present invention is based on storage system and the method for the distributed network of naming mechanism, by the network interface address of named data and local address being stored in same this locality and network element tables of data, the named data stored with this locality is in a network made to adopt same description mechanism, receive request bag can search named data on network level and storage aspect simultaneously, storage aspect is searched named data without the need to through extra data processing step, simplify the search procedure of named data, improve the search efficiency of named data.
Accompanying drawing explanation
Fig. 1 is nodal analysis method schematic diagram of the present invention;
Fig. 2 is that the present system overall situation disposes schematic diagram;
Fig. 3 is procotol stack architecture of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention will be further described.
The present invention propose a kind of in network level and accumulation layer in the face of the data block named is designed for uniformity, the distributed data-storage system of flattening.The design of named data network (Named Data Networking NDN) of this system reference, and the memory mechanism of itself and file system is combined, define a kind of novel distributed memory system framework, each network node is NDSS network node.
The present invention adds local and network element tables of data on the basis of named data network, and described this locality and network element tables of data at least comprise title prefix entries, network interface address list item and local address list item;
Wherein, described title prefix entries stores the title prefix of named data;
Described network interface address list item stores the network interface address of named data;
Described local address list item stores the local address of named data.
NDN project rises in CCN (Content Cetntirc Networking content center network) project.CCN project is that the atropic research center, handkerchief Lip river of Xerox is initiated, and its design philosophy is that the Van Jacobson of the U.S. proposed.Mainly for extensibility and the effective contents distribution problem of current ICP/IP protocol, this problem has several years ago caused the research boom of nerve of a covering (Overlay Network) and content distributing network (Content Delivery Network).But find through application practice for many years, P2P and CDN still comes with some shortcomings when solving contents distribution problem, the problem of such as network/net neutrality and large scale deployment.This new network architecture of NDN to be intended to utilize to the name of data to replace IP layer, becomes new network eel-like figure, and namely levels network needs the standard followed.The contrast of TCP/IP procotol and NDN procotol as shown in Figure 1.Wherein Content chuncks is named data block.
(1) named data block structure
Data block size changes according to the difference of storage medium.Such as in general hard disk, a sector storage size is 4096B, then in this distributed memory system, the size of data block is defaulted as 4096B.
Data block contents is divided into 4 parts, and Part I is the name of this data block.Data block naming method adopts the naming method of general URI, such as: ndn: //tsinghua.edu.cn/video/intro.avi/s001/v001 or http://portal.tsinghua.edu.cn/index.php/2013_11_10/v012.Name for data can be any, can follow the general specification of URL name at that time.
Part II is selective sections, is digital signature, for Part I name, and the digital signature of Part III signing messages and Part IV data particular content.Generally can adopt SHA-1, X.509 wait unsymmetrical key signature technology.
Part III is also selective sections, is signing messages, comprises the PKI etc. of signer.
Part IV is the concrete structure of this named data block.
Data block adopts and can adopt xml coding that TLV also can be adopted to encode, and is a kind of example of coded format below.Wherein datablock is data block label, and name is data name label, and signature is digital signature label, and signedinfo is signing messages label, and data is concrete data label.
<datablock>
<name></name>
<signature></signature>
<signedinfo></signedinfo>
<data></data>
</datablock>
(2) named data block request format
The request of named data block is one section of message sequence, and request foremost is necessary for the name of data.Other field corresponding can be increased below according to real needs.
(3) system node model
System node model reference NDN nodal analysis method designs, and local and network element tables of data can manage local data, and nodal analysis method schematic diagram as shown in Figure 2.
Wherein NDS Node is the nodal analysis method of native system, named data storage system (Named Data Storage System NDSS).The main task of nodal analysis method is, response upper level applications initiate for this locality or long-range request of data, response or the outside request for named data of process.If through the local metadata table of inquiry (LFIB), these data exist, then direct according to request of data direction, carry out inverse response; If there is no, then Forward-reques is carried out according to LFIB.
LFIB is local and network element tables of data (Local and Forwarding Information Base), for this locality is stored in network element tables of data.This table mainly contains three list items, name prefix (Prefix), interface table (Face list), local storage information (Local inode).Name prefix is similar to the IP prefix of IP route table, is exactly a part before several word.Such as http://tsinghua.edu.cn/index/2013_11_10/v015, then wherein a kind of prefix is http://tsinghua.edu.cn/.Interface table is used for storing, and after meeting the request of the prefix stored in table, which interface should carry out request msg to.Such as, for the request of data of/parc.com/audios/ prefix in figure, Forward-reques should be carried out to 0 interface and 1 interface.Local inode is used for storing the position of named data block in local memory device.
Request wait list (Pending Request Table, PRT) is used for storing the request still also do not responded arrived.When there being data block request to arrive node, through inquiry LFIB this locality not these data, this request of data will be forwarded.And this request of data also can be recorded in PRT.The data structure of PRT is the name of data, and the interface name in request of data source.
CS is content caching structure (Content Store), can the named data block that returns of temporary cache NDSS.After node returns the data block existing for this locality or obtains named data block that adjacent node returns, can by this data-block cache in CS.The store data structure of CS is name (name) and data block (block).The replacement policy of buffer memory can carry out individual cultivation according to the real needs of system.
The concept of interface is the source of request of data and named data block and forwarding whereabouts.Remote interface is the network port, such as wired with wireless Ethernet interface.The local request that directly can process local program.
The handling process of local request is:
Local program sends named data request to NDSS node procedure, and first NDSS searches local CS buffer memory, if there is this named data block of buffer memory, then directly returns this data block.Inquire about PRT table afterwards, if there is the request waiting for identical data, then increase the request interface of PRT list item.No, then request of data is recorded in PRT table.Search LFIB table afterwards.If there is this data block in this locality, then directly return to local program.According to the record of PRT table, by the request waited for, oppositely send to data request interface (except the request of this locality), delete the corresponding entry of PRT table.Finally according to configured cache policy, this data block is put into CS.
The handling process of external request is:
External request from certain interface to NDSS node after first can search and local first search local CS buffer memory, if there is this named data block of buffer memory, then directly return this data block.Inquire about PRT table afterwards, if there is the request waiting for identical data, then increase the request interface of PRT list item.No, then request of data is recorded in PRT table.Search LFIB table afterwards.If there is this data block in this locality, according to the record of PRT table, by the request waited for, data request interface is oppositely sent to delete the corresponding entry of PRT table.Finally according to configured cache policy, this data block is put into CS.If not this data block, then according to the Face list network interface of LFIB table, request forward is gone out.
The handling process that outside named data returns is:
After external data block turns back to NDSS node, can show, by the interface of reverse for data block return recording according to PRT.Delete the corresponding entry of PRT table afterwards, finally according to configured cache policy, this data block is put into CS.
(4) system world model
Global system is intended to according to a set of distributed memory system prototype of aforementioned memory node modelling.Native system is made up of the property server of the agreement and instruction supporting native system to follow or virtual server.Each node supports identical communication protocols, adopts same nodal analysis method.But for an overall distribution formula group of planes, each responsibility is different from the division of labor, so the emphasis of each division of labor node when system is different.If Fig. 3 is that the system overall situation disposes schematic diagram.System is divided into three layers: core layer, is mainly NDSS core router, Guinier-Preston zone, and be NDSS bis-layers of router, boundary layer is NDSS client or storage server.
Wherein NDSS Core Router is system core router, is positioned at the core position of group of planes topology.Be mainly used to a large amount of forwarding of request of data of process and returning of named data bag.When system, NDSS Core should have the ability of larger forwarding data bag.
NDSS L2 Router is system two layers of router, bears the request of data of boundary node and the forwarding of named data bag.Its primary responsibility is that boundary node carries out buffer memory in addition, so in concrete enforcement, need for the jumbo CS of its design comparison.
NDSS Com is common border NDSS application server, can run the abundant application based on NDSS system data request protocol above.NDSS Repo is NDSS data storage server, can design jumbo persistent storage for it.
The procotol adopting following (5) to describe between node connects
(5) network connects
In order to ensure the high-efficiency network transmission between NDSS node, grid upper-layer protocol does not adopt ICP/IP protocol, but directly will run the procotol of NDSS on link layer.Wherein run Ethernet protocol (Ethernet Frame) for link layer.The named data block (NDSS Chunks) of NDSS is directly encapsulated in each ethernet frame.Physical Layer is physical layer, i.e. the physical medium of delivery network signal.
The present invention goes for general commercial server cluster, and embodiment is below a kind of case study on implementation, and other concrete execution modes with reference to the design in summary of the invention, can design according to demand.
In this example, server node is, runs the general commercial server of (SuSE) Linux OS.Network level directly runs ethernet network agreement.The program being responsible for NDSS processing data packets flow process operates on this server as kernel process.
The disk of server storage device to be sector-size be 4096B.Each sector directly stores a named data block.The LFIB table of NDSS process directly carries out metadata management to the named data block on disk.This process directly can read the data block on hard disk sector.
Server via Ethernet card, is undertaken encapsulating by named data bag by ethernet frame agreement and transmits.Maximum frame length due to general ethernet frame is 1500 bytes.In order to an ethernet frame can encapsulate a complete named data block.Need maximum for Ethernet frame length to be adjusted to be greater than 4096 bytes.Now commercially a lot of Ethernet switch and Ethernet card support are greater than the Ethernet frame length of 4096 bytes.
Embodiment 1
The present embodiment is based on the distributed network storage system of naming mechanism, each network node at least comprises local and network element tables of data, and described this locality and network element tables of data at least comprise title prefix entries, network interface address list item and local address list item;
Wherein, described title prefix entries stores the title prefix of named data;
Described network interface address list item stores the network interface address of named data;
Described local address list item stores the local address of named data.
Described network node also comprises content caching table and request wait list, wherein,
Described data cached table stores the named data of this target node;
Described wait required list stores the request data package that this network node receives.
The method of the system responses request bag described in the present embodiment comprises:
Receiving package contains the request bag of the title prefix of named data;
The request bag request of reception is joined request in wait list;
Content caching table response request bag, wherein response method is: search in described data cached table the title prefix that whether there is the named data title prefix that contains with described request handbag and match,
If exist, then what this named data is sent to described request bag sends node, and waits for request accordingly in deletion wait required list;
If do not exist, then search local with network element tables of data in whether exist wrap with request in the title prefix that matches of title prefix,
If exist, then described this locality and network element tables of data response request bag, and in removal request wait list, ask bag accordingly;
If do not exist, then do not process.
The method of described this locality and network element tables of data response request bag at least comprises:
The title prefix of the named data title prefix in described request bag stored with described title prefix entries is mated,
If there is occurrence, then search should the network interface address of named data of title prefix and/or local address at described network interface address list item and/or described local address list item;
Based on lookup result by should the named data of title prefix be back to described request bag send node;
If without occurrence, then do not process.
Described in network interface address list item described in described network interface address list item and/or described local address list item, search this named data network interface address and/or local address, concrete steps comprise:
Judge whether described network interface address list item and local address list item search priority,
If there is priority, then search in the list item that priority is high based on priority;
If there is no priority, then Network Search interface entry and local address list item while.
Described based on lookup result by should the named data of title prefix be back to described request bag send node, concrete steps comprise:
If find the network interface address of network naming data in network interface list item, then the described request bag of reception is sent to described network interface address, this network interface address returns corresponding named data, exports this named data and sends node to described request bag;
If find network naming data in local address list item, then export this named data and send node to described request bag;
If find in network interface list item and local address list item simultaneously, then the priority exported based on result exports corresponding named data by network interface address list item or local address list item.
Embodiment 2
The present embodiment is based on the distributed network storage means of naming mechanism, each network node at least comprises local and network element tables of data, described this locality and network element tables of data at least comprise title prefix entries, network interface address list item and local address list item, wherein, described title prefix entries stores the title prefix of named data, described network interface address list item stores the network interface address of named data, and described local address list item stores the local address of named data;
Described method at least comprises:
Receiving package contains the request bag of the title prefix of named data;
Request bag described in described this locality and network element tables of data respond, wherein response method comprises:
The title prefix of the named data title prefix in described request bag stored with described title prefix entries is mated,
If there is occurrence, then search should the network interface address of named data of title prefix and/or local address at described network interface address list item and/or described local address list item;
Based on lookup result by should the named data of title prefix be back to described request bag send node;
If without occurrence, then do not process.
Further, described in network interface address list item described in described network interface address list item and/or described local address list item, search this named data network interface address and/or local address, concrete steps comprise:
Judge whether described network interface address list item and local address list item search priority,
If there is priority, then search in the list item that priority is high based on priority;
If there is no priority, then Network Search interface entry and local address list item while.
Further, described based on lookup result by should the named data of title prefix be back to described request bag send node, concrete steps comprise:
If find the network interface address of network naming data in network interface list item, then the described request bag of reception is sent to described network interface address, this network interface address returns corresponding named data, exports this named data and sends node to described request bag;
If find network naming data in local address list item, then export this named data and send node to described request bag;
If find in network interface list item and local address list item simultaneously, then the priority exported based on result exports corresponding named data by network interface address list item or local address list item.
Further, described network node also comprises content caching table and request wait list, and described method also comprises:
The request bag request of reception is joined request in wait list;
Content caching table response request bag, wherein response method is: search in described data cached table the title prefix that whether there is the named data title prefix that contains with described request handbag and match,
If exist, then what this named data is sent to described request bag sends node, and waits for request accordingly in deletion wait required list;
If do not exist, then search local with network element tables of data in whether exist wrap with request in the title prefix that matches of title prefix,
If exist, then described this locality and network element tables of data response request bag, and in removal request wait list, ask bag accordingly;
If do not exist, then do not process.
Above; be only preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, the protection range that protection scope of the present invention should define with claim is as the criterion.
Claims (6)
1. the distributed network storage system based on naming mechanism, it is characterized in that: each network node at least comprises local and network element tables of data, and described this locality and network element tables of data at least comprise title prefix entries, network interface address list item and local address list item;
Wherein, described title prefix entries stores the title prefix of named data;
Described network interface address list item stores the network interface address of named data;
Described local address list item stores the local address of named data.
2. according to the claim distributed network storage system based on naming mechanism according to claim 1, it is characterized in that: described network node also comprises content caching table and request wait list, wherein,
Described data cached table stores the named data of this target node;
Described wait required list stores the request data package that this network node receives.
3. the distributed network storage means based on naming mechanism, it is characterized in that: each network node at least comprises local and network element tables of data, described this locality and network element tables of data at least comprise title prefix entries, network interface address list item and local address list item, wherein, described title prefix entries stores the title prefix of named data, described network interface address list item stores the network interface address of named data, and described local address list item stores the local address of named data;
Described method at least comprises:
Receiving package contains the request bag of the title prefix of named data;
Request bag described in described this locality and network element tables of data respond, wherein response method comprises:
The title prefix of the named data title prefix in described request bag stored with described title prefix entries is mated,
If there is occurrence, then search should the network interface address of named data of title prefix and/or local address at described network interface address list item and/or described local address list item;
Based on lookup result by should the named data of title prefix be back to described request bag send node;
If without occurrence, then do not process.
4., according to the claim distributed network storage means based on naming mechanism according to claim 3, it is characterized in that:
Described in network interface address list item described in described network interface address list item and/or described local address list item, search this named data network interface address and/or local address, concrete steps comprise:
Judge whether described network interface address list item and local address list item search priority,
If there is priority, then search in the list item that priority is high based on priority;
If there is no priority, then Network Search interface entry and local address list item while.
5., according to the claim distributed network storage means based on naming mechanism according to claim 3, it is characterized in that:
Described based on lookup result by should the named data of title prefix be back to described request bag send node, concrete steps comprise:
If find the network interface address of network naming data in network interface list item, then the described request bag of reception is sent to described network interface address, this network interface address returns corresponding named data, exports this named data and sends node to described request bag;
If find network naming data in local address list item, then export this named data and send node to described request bag;
If find in network interface list item and local address list item simultaneously, then the priority exported based on result exports corresponding named data by network interface address list item or local address list item.
6. the distributed network storage means based on naming mechanism according to claim 3, is characterized in that: described network node also comprises content caching table and request wait list, and described method also comprises:
The request bag request of reception is joined request in wait list;
Content caching table response request bag, wherein response method is: search in described data cached table the title prefix that whether there is the named data title prefix that contains with described request handbag and match,
If exist, then what this named data is sent to described request bag sends node, and waits for request accordingly in deletion wait required list;
If do not exist, then search local with network element tables of data in whether exist wrap with request in the title prefix that matches of title prefix,
If exist, then described this locality and network element tables of data response request bag, and in removal request wait list, ask bag accordingly;
If do not exist, then do not process.
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