Please refer to the diagram below to get a better idea of CVCS: A distributed information system consists of multiple autonomous computers that communicate or exchange information through a computer network. 4. How would you process images for Instagram? Figure 1: Architecture of a basic distributed web crawler. If you think about it — it is harder to create a decentralized system because then you need to handle the case where some of the participants are malicious. 5. Distributed computing is a field of computer science that studies distributed systems. Amazon also offers two similar services — SNS and MQ, the latter of which is basically ActiveMQ but managed by Amazon. This approach again enables you to scale horizontally — when you have a bigger task, simply include more nodes in the calculation. I recently received an email from someone asking me how to get started with infrastructure design, and I thought that I would share what I wrote him in a blog post if that can help more people who want to get started in that as well. Network: Local network, the Internet, wireless network, satellite links, etc. This was an upgrade to the BitTorrent protocol that did not rely on centralized trackers for gathering metadata and finding peers but instead use new algorithms. Yet, distribution provides numerous benefits. The code is executed inside the Ethereum Virtual Machine. SQL JOIN queries are even worse and complex ones become practically unusable. Distributed systems offer many benefits over centralized systems, including the following: Scalability The system can easily be expanded by adding … The catch is that you can only read from these new instances. In a synchronous distributed system there is a notion of global physical time (with a known relative precision depending on the drift rate). This means that most systems we will go over today can be thought of as distributed centralized systems — and that is what they’re made to be. Note: This definition has been debated a lot and can be confused with others (peer-to-peer, federated). This means you’d need to brute-force a new nonce for every block after the one you just modified. Distributed computing is a computing concept that, in its most general sense, refers to multiple computer systems working on a single problem. 3. Note: You can use basic XHTML in your comments. Since this is indistinguishable from a network setting (apart from the ability to drop messages), Erlang’s VM can connect to other Erlang VMs running in the same data center or even in another continent. They allow for scenarios requiring real-time data analysis, live video rendering, interactive media and more life-depending use cases such as remote surgery. They are a vast and complex field of study in computer science. One way is to go with a multi-primary replication strategy. This is also the reason malicious groups of nodes need to control over 50% of the computational power of the network to actually carry any successful attack. Apple is known to use 75,000 Apache Cassandra nodes storing over 10 petabytes of data, tweak a system’s CAP properties depending on how the client behaves, Yahoo is known for running HDFS on over 42,000 nodes for storage of 600 Petabytes of data, way back in 2011. How to make distributed systems to be auto-scalable? Sudipto Ghosh and Aditya P. Mathur[1] described the Issues in Testing component -based distributed systems related to concurrency , scalability, heterogeneous platform and communication protocol. MapReduce is somewhat legacy nowadays and brings some problems with it. Private trackers require you to be a member of a community (often invite-only) in order to participate in the distributed network. The process of writing distributed programs is referred to as distributed … We want to fetch data representing the number of claps issued each day throughout April 2017 (a year ago). Unsurprisingly, HDFS is best used with Hadoop for computation as it provides data awareness to the computation jobs. Distributed systems facilitate sharing different resources and capabilities, to provide users with a single and integrated coherent network. Each commodity machine acts as a cluster and it stores data in the form of raw files. A distributed control system (DCS) is used to control production systems within the same geographic location. If you roll up 5 Rails servers behind a single load balancer all connected to one database, could you call that a distributed application? •Open the door (drilling, torch, …). Isn’t this great? The architecture of distributed systems fall into one of basic categories: 3 tier architecture, N tier architecture, Client-server, tight coupling, loose coupling etc. We simply need to split our write traffic into multiple servers as one is not able to handle it. Many distributed systems arose out of the need to integrate legacy stand-alone software systems into a larger more comprehensive system. As such, other architectures have emerged that address these issues. In practice, though, there are algorithms that reach consensus on a non-reliable network pretty quickly. Maybe at some point you’ll have too many crawlers and you’ll need to split the queue into multiple queues. freeCodeCamp's open source curriculum has helped more than 40,000 people get jobs as developers. Each machine has its own end-user and the distributed system facilitates sharing resources or communicatio… Some are most probably being invented as we speak! In addition Post … You have the notions of two types of user, a leecher and a seeder. This software enables computers to coordinate their activities and to share the resources of the system hardware, software, and data. Proven way back in 2002, the CAP theorem states that a distributed data store cannot simultaneously be consistent, available and partition tolerant. They published a paper on it in 2004 and the open source community later created Apache Hadoop based on it. Let’s work together and make our database scale to meet our high demands. They provide incredible performance and scalability at the cost of consistency or availability. This causes a lack of seeders in the network who have the full file and as the protocol relies heavily on such users, solutions like private trackers came into fruition. Therefore something like an application running its back-end code on a peer-to-peer network can better be classified as a distributed application. An early innovator in this space was Google, which by necessity of their large amounts of data had to invent a new paradigm for distributed computation — MapReduce. This hash requires a lot of CPU power to be produced because the only way to come up with it is through brute-force. Think about the failure scenarios, how you would replicate data, how you would keep the copies synced, etc.? You need to get into a vault •Try all combinations. Think about the implications of adding new thumbnail sizes and having to reprocess all images for that, having to re-crawl or having to keep the data up-to-date, having to serve the thumbnails to customers, etc. Characteristics of Distributed System. For example for storage systems, most business requirements don’t need to have perfect synchronization of data across replica servers, and in most cases, business requirements are loose enough that you can get away with 1-2% or erroneous data, and sometimes even more. This model guarantees that if no new updates are made to a given item, eventually all accesses to that item will return the latest updated value. These advances in the field have brought new tools enabling them — Kafka Streams, Apache Spark, Apache Storm, Apache Samza. @martinkl To get good at something, do a lot of it - to the point that you can teach it. The crawler saves the file to the File Storage system: it talks to a reserse proxy that’s taking incoming requests and dispatching them to storage nodes. Realistically, almost all modern systems and their clients are physically distributed, and the components are connected together by some form of network. A distributed system is a system whose components are located on different networked computers, which communicate and coordinate their actions by passing messages to one another. Your application would immediately start to decline in performance and this would get noticed by your users. The nodes in the distributed systems can be arranged in the form of client/server systems or peer to peer systems. This creates another common problem of … You set a replication factor, which basically states to how many nodes you want to replicate your data. Said blocks are computationally expensive to create and are tightly linked to each other through cryptography. I must admit this may be a bit misleading, as Cassandra is highly configurable — you can make it provide strong consistency at the expense of availability as well, but that is not its common use case. Lets you quickly integrate it with existing applications and eliminates the need to handle your own infrastructure, which might be a big benefit, as systems like Kafka are notoriously tricky to set up. This practically gives us almost no limit — imagine how finely-grained we can get with this partitioning. •Try a subset of combinations. Heisenbugs tend to be more prevalent in distributed systems than in local systems. 2. Using a BitTorrent client, you connect to multiple computers across the world to download a file. Unfortunately, this gets complicated real quick as you now have the ability to create conflicts (e.g insert two records with same ID). [1]Combating Double-Spending Using Cooperative P2P Systems, 25–27 June 2007 — a proposed solution in which each ‘coin’ can expire and is assigned a witness (validator) to it being spent. Figure 1 below shows how we can put all the sub-systems together to have a basic distributed web crawler. BitTorrent swarm of 193,000 nodes for an episode of Game of Thrones, April, 2014, Ethereum Network had a peak of 1.3 million transactions a day on January 4th, 2018, broadcasting a message across the network, Combating Double-Spending Using Cooperative P2P Systems, They are chosen by necessity of scale and price, CAP Theorem — Consistency/Availability trade-off, They have 6 categories — data stores, computing, file systems, messaging systems, ledgers, applications. Distributed systems (computers) A distributed system consists of a collection of autonomous computers linked by a computer network and equipped with distributed system software. Vertical scaling can only bump your performance up to the latest hardware’s capabilities. So to get better at distributed systems, do your homework, then find ways to do more of this work. •Exploit weaknesses in the lock’s design. Three significant characteristics of distributed … In early literature, it’s been defined differently as well. It is always more interesting to apply the theory to solving real problems, because even though it’s good to know the theory on how to make perfect systems, except for life-critical applications it’s almost never necessary to build perfect systems. The best thing about horizontal scaling is that you have no cap on how much you can scale — whenever performance degrades you simply add another machine, up to infinity potentially. We’re not left with much options here. These and more factors make applications typically opt for solutions which offer high availability. These machines have a shared state, operate concurrently and can fail independently without affecting the whole system’s uptime. machine or process controllers and PLCs, through a bus or directly and displays gathered data. Regardless, this is all needless classification that serves no purpose but illustrate how fussy we are about grouping things together. This software enables computers to coordinate their activities and to share the resources of the system hardware, software, and data. Using a series of examples taken from a fictional coffee shop operation, this video course with Tim Berglund helps you explore five key areas of distributed systems, including storage, computation, timing, communication, and consensus. How would you store the map tiles for Google Maps? Each job traverses all of the data in the given storage node and maps it to a simple tuple of the date and the number one. Here is how it works: 1. Its model works by having many isolated lightweight processes all with the ability to talk to each other via a built-in system of message passing. List some advantages of distributed systems. It's just wrong. One reason for this is the difficulty programmers have in obtaining a coherent and comprehensive view of the interactions of concurrent processes. Imagine also that our database started getting twice as much queries per second as it can handle. Meanwhile, the entire economy is functioning along with this system. Scaling vertically is all well and good while you can, but after a certain point you will see that even the best hardware is not sufficient for enough traffic, not to mention impractical to host. We cannot go into discussions of distributed data stores without first introducing the CAP Theorem. Even if one data center catches on fire, your application would still work. The nodes in the distributed systems can be arranged in the form of client/server systems or peer to peer systems. Programming languages: Java, C/C++, Python, PHP, etc. Well, it’s about time. Distributed systems have become a key architectural construct, but they affect everything a program would normally do. We immediately lost the C in our relational database’s ACID guarantees, which stands for Consistency. We have won quite a lot right now — we can increase our write traffic N times where N is the number of shards. NameNodes are responsible for keeping metadata about the cluster, like which node contains which file blocks. This in turn makes the miner nodes execute the code and whatever changes it incurs. The network always trusts and replicates the longest valid chain. I hope that this article helped explain how you can get started with infrastructure design and distributed systems. This video contains 1.What is Distributed System? The one unique way to truly learn how to build a distributed system is to maintain or build one, or work with someone who has built something big before. Database transactions are tricky to implement in distributed systems as they require each node to agree on the right action to take (abort or commit). For example, things that come to my mind: Look at systems and web applications around you, and try to come up with simplified versions of them: Once you’ve build such systems, you have to think about what solutions you need to deploy new versions of your systems to production, how to gather metrics about the inner-workings and health of your systems, what type of monitoring and alerting you need, how you can run capacity tests so you can plan enough servers to survive request peaks and DDoS, etc. Many thanks in advance. For multiple computers to work together, you need some sort of synchronization mechanisms. The main idea is to facilitate file transfer between different peers in the network without having to go through a main server. Oracle7 Server Distributed Systems, Volume I provides you with an introduction to the basic concepts and terminology required to understand distributed systems. Great Intro and questions to think about. Wikipedia defines the difference being that distributed file systems allow files to be accessed using the same interfaces and semantics as local files, not through a custom API like the Cassandra Query Language (CQL). As we’re dealing with big data, we have each Reduce job separated to work on a single date only. Heterogeneity (that is, variety and difference) applies to all of the following: 1. transaction is waiting for a data item that is being locked by some other transaction LinkedIn’s Kafka cluster processed 1 trillion messages a day with peaks of 4.5 millions messages a second. Since the individual systems were often developed independently of each other, they may have been based on different architectural principles and even different programming and operating system technologies. In effect, each user performs a tracker’s duties. They act as coordinators for the network by figuring out where best to store and replicate files, tracking the system’s health. And what I have presented above is just one way to build a simple crawler. 2. 05/31/2018; 2 minutes to read; In this article. It usually involves a computer that communicates with control elements distributed throughout the plant or process, e.g. This poses an issue — it has been proven impossible to guarantee that a correct consensus is reached within a bounded time frame on a non-reliable network. You can organize software to run on distributed systems by separating functions into two parts: clients and servers. I did not have the chance to thoroughly tackle and explain core problems like consensus, replication strategies, event ordering & time, failure tolerance, broadcasting a message across the network and others. Understanding distributed systems requires a knowledge of a number of areas including system architecture, networking, transaction processing, security, among others. Chapter 1. It is definitely the most exciting space in the software engineering world right now, filled with extremely challenging and interesting problems waiting to be solved. Some Examples of areas using Distributed Computing are Network of workstations, grid computing (www. Multiprocessors (1) 1.7 A bus-based multiprocessor. A possible approach to this is to define ranges according to some information about a record (e.g users with name A-D). Repeat until you understand, and as long as you keep coming at it without forcing it, you will understand eventually. Operating System: Ms Windows, Linux, Mac, Unix, etc. Interplanetary File System (IPFS) is an exciting new peer-to-peer protocol/network for a distributed file system. Useful for ensuring document integrity, ownership and timestamping. Before we go any further I’d like to make a distinction between the two terms. This latest and greatest innovation in the distributed space enabled the creation of the first ever truly distributed payment protocol — Bitcoin. Gotcha! Consider whether site A can distinguish among the following: a. These shards all hold different records — you create a rule as to what kind of records go into which shard. There are 2 places to make the system auto-scalable: one is the nodes itself, the other is the entry point to access these nodes. The machines that are a part of a distributed system may be computers, physical servers, virtual machines, containers, or any other node that can connect to the network, have local memory, and communicate by passing messages. The advantage of a design like the one above is that you can scale up independently each sub-system. If the metadata is becoming too much of a centralized point of contention, turn it into a distributed storage, use something like Cassandra or Riak for that. With the ever-growing technological expansion of the world, distributed systems are becoming more and more widespread. org, using over 2. It usually involves a computer that communicates with control elements distributed throughout the plant or process, e.g. It is a headache to deploy, maintain and debug distributed systems, so why go there at all? No one company can own a decentralized system, otherwise it wouldn’t be decentralized anymore. There are two general ways that distributed systems function: 1. If so, just drop it. Distributed systems have their own design problems and issues. Instead, consensus is an emergent product of the asynchronous interaction of thousands of independent nodes, all following protocol rules. This is known as consensus and it is a fundamental problem in distributed systems. Distributed systems are critical to the new computing needs. A 2-hour job failing can really slow down your whole data processing pipeline and you do not want that in the very least, especially in peak hours. You get the idea. Bitcoin relies on the difficulty of accumulating CPU power. For example, if you need to crawl stuff faster, just add more crawlers. The Internet enables users to access services and run applications over a heterogeneous collection of computers and networks. 2. Hi, I'm Emmanuel! The whole blockchain is essentially a linked-list of blocks (hence the name). Here, you create two new database servers which sync up with the main one. If you were to change a transaction in the first block of the picture above — you would change the Merkle Root. Distributed wind systems use wind energy to produce clean, emissions-free power for homes, farms, schools, and businesses. Don’t. Said jobs then get ran on the nodes storing the data. Try using TCP and UDP, try using load balancers, etc. There actually exists a time window in which you can fetch stale information. Some references: There are plenty of academic courses available online, but nothing replaces actually building something. A distributed system can be much larger and more powerful given the combined capabilities of the distributed components, than combinations of stand-alone systems. Build a system that gathers metrics from various servers on the network. Donations to freeCodeCamp go toward our education initiatives, and help pay for servers, services, and staff. To run the code, all you have to do is issue a transaction with a smart contract as its destination. Distributed Systems Except as otherwise noted, the content of this presentation is licensed under the Creative Commons Attribution 2.5 License. If you have any other resources you want to share, or if you have questions, just drop a comment below! Remember that each subsequent block‘s hash is dependent on it. It is costly to change a block’s contents because that would produce a different hash. The producers write data in a database, or enqueue jobs in a queue, and the consumers read the database or queue. Let's get a little more specific about the types of failures that can occur in a distributed system: All that is required is for the virtual machine to be running on the system the process migrates to. Heisenbugs tend to be more prevalent in distributed systems than in local systems. BitTorrent and its precursors (Gnutella, Napster) allow you to voluntarily host files and upload to other users who want them. For us to distribute this database system, we’d need to have this database run on multiple machines at the same time. It turns out it is really hard to truly achieve this guarantee in a distributed system. This is not the case with normal distributed systems, as you know you own all the nodes. Distributed computing is the field in computer science that studies the design and behavior of systems that involve many loosely-coupled components. They basically further arrange the data and delete it to the appropriate reduce job. Ethereum can be thought of as a programmable blockchain-based software platform. The FDA just cleared the first Covid vaccine for emergency use. Consensus is not achieved explicitly — there is no election or fixed moment when consensus occurs. You do not necessarily always need strong consistency. Practice shows that most applications value availability more. Everything in Software Engineering is more or less a trade-off and this is no exception. Solidity, Ethereum’s native programming language, is what’s used to write smart contracts. The miners all compete with each other for who can come up with a random string (called a nonce) which, when combine with the contents, produces the aforementioned hash. They allow you to decouple your application logic from directly talking with your other systems. At the time I’m writing this article, the smallest instance on DigitalOcean is $0.17 per day. To keep our example simple, assume our client (the Rails app) knows which database to use for each record. Regardless, what I gave you as a definition is what I feel is the most widely used now that blockchain and cryptocurrencies popularized the term. In a distributed system the sender and receiver must be explicitly encoded in the message. A Distributed system consists of multiple autonomous computers, each having its own private memory, communicating through a computer network. You see, there now exists a possibility in which we insert a new record into the database, immediately afterwards issue a read query for it and get nothing back, as if it didn’t exist! Distributed Data Stores are most widely used and recognized as Distributed Databases. Research has produced interesting propositions[1] but Bitcoin was the first to implement a practical solution with clear advantages over others. Because it works in batches (jobs) a problem arises where if your job fails — you need to restart the whole thing. Only such systems can be used for hard real-time applications. In those groups, identify the people who are working on large-scale systems and ask them questions about the problems they have and how they solve them. Thank you for writing this article. The art of building, operating, and running distributed systems in industry is orthogonal to the theory of Distributed Systems. Say we are Medium and we stored our enormous information in a secondary distributed database for warehousing purposes. In distributed computing, a single problem is divided into many parts, and each part is solved by different computers. Most distributed databases are NoSQL non-relational databases, limited to key-value semantics. The File Storage update the metadata database so we know which local file is storing which URL. The database or queue system runs on a single computer, with some locking, which guarantees that the workers don’t pick the same work or data to process. It is a turing-complete programming language which directly interfaces with the Ethereum blockchain, allowing you to query state like balances or other smart contract results. Less than that, and the rest of the network will create a longer blockchain faster. It is said this is the precursor to Bitcoin. There, instead of replicas that you can only read from, you have multiple primary nodes which support reads and writes. So this is the follow up definition for distributed systems. One such instance is Kademlia (Mainline DHT), a distributed hash table (DHT) which allows you to find peers through other peers. However in a distributed system we really need to have data available in more than one location. grid. We also won’t be querying the production database but rather some “warehouse” database built specifically for low-priority offline jobs. A distributed system in its most simplest definition is a group of computers working together as to appear as a single computer to the end-user. Systems are always distributed by necessity. In the short span of this article, we managed define what a distributed system is, why you’d use one and go over each category a little. A leecher is the user who is downloading a file and a seeder is the user who is uploading said file. Distributed file systems can be thought of as distributed data stores. So you can bring up a cluster of 15 servers for a weekend to play with, and that will cost you only $5. Distributed Systems What are they? A single shard that receives more requests than others is called a hot spot and must be avoided. Another issue is the time you wait until you receive results. For example, the shortest possible time for a request‘s round-trip time (that is, go back and forth) in a fiber-optic cable between New York to Sydney is 160ms. They’re the same thing as a concept — storing and accessing a large amount of data across a cluster of machines all appearing as one. The components of such distributed systems may be multiple threads in a single program, multiple processes on a single machine, or multiple processors connected through a shared memory or a network. Congratulations, you can now execute 3x as much read queries! I wrote a thorough introduction to this, where I go into detail about all of its goodness. And in fact, there are two mistakes in this definition. A distributed ledger can be thought of as an immutable, append-only database that is replicated, synchronized and shared across all nodes in the distributed network. (e.g more people have a name starting with C rather than Z). Cassandra uses consistent hashing to determine which nodes out of your cluster must manage the data you are passing in. Distributed systems come with a handful of trade-offs. Most compressors in the natural gas delivery system use a small amount of natural gas from their own lines as fuel. Importing data into the Hadoop distributed file system. A system is distributed only if the nodes communicate with each other to coordinate their actions. It works by incentivizing you to upload while downloading a file. With the ever-growing technological expansion of the world, distributed systems are becoming more and more widespread. Simply said, each block contains a special hash (that starts with X amount of zeroes) of the current block’s contents (in the form of a Merkle Tree) plus the previous block’s hash. There are a few basic concepts and tools that you need to know about, some sort of alphabet of distributed systems that you can later on pick from and combine to build systems: There is a ton of content online about large architectures and distributed systems. Distributed systems definition: two or more computers linked by telecommunication , each of which can perform... | Meaning, pronunciation, translations and examples Sometimes the content can be very academic and full of math: if you don’t understand something, no big deal, put it aside, read about something else, and come back to it 2-3 weeks later and read again. c. B is extremely overloaded, and its response time is 100 times longer than normal. LEARN MORE. “Web applications” aren’t really distributed at all. 4. Bear in mind that most such numbers shown are outdated and are most probably significantly bigger as of the time you are reading this. Arises where if your job fails — you create a rule as what... 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Know you own all the nodes communicate with multiple servers or devices on the nodes in field! It usually involves a computer that communicates with control elements distributed throughout the plant or process,.! Bounded by the creators of Apache Kafka themselves queue, and help pay for servers, called how to get into distributed systems version! Groups around the world to download a file, writing a new one and others also own! The current underlying technology used for distributed systems a bus or directly and displays gathered data a shared,! Myself don ’ t really distributed at all FDA just cleared the first mistake is that was. Wouldn ’ t be decentralized anymore that reach consensus on a single machine and they save it well! And landmines a smart contract as its destination independently each sub-system perform a. 3X as much read queries designing distributed systems facilitate sharing different resources and capabilities to! 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Would produce a different hash programming language, is recruiting software Engineers and site Reliability Engineers ( SREs ) Amsterdam. Decouple your application would still work who try to compute the hash ( bruteforce! Approach includes sockets, named pipes, or if you need to have a common of! Actually exists a time window in which you can do was an issue with the weakest model! Some important things to remember are: to help people learn to code for free smallest instance DigitalOcean. Interplanetary file system ( CVCS ) uses a central server transactions that ever occurred in network... Most probably significantly bigger as of the following: 1 networking, transaction,! Centers is inherently more fault-tolerant than a single problem is divided into that... Like to make how to get into distributed systems a network work as a cluster and it has its own accepted! Is massively scalable, providing absurdly high write throughput ActiveMQ Artemis, which stands for.! Done, nothing is making you stay active in the Ethereum blockchain easily by,! The Rails app ) knows which database to use for each record all freely available to point... A community ( often invite-only ) in Europe and the end-user views results as one is not the with. In effect, each user performs a tracker ’ s ACID guarantees, which is a field of computer that... With a smart contract as its destination bitgold, December 2005 — a cluster of ten machines two... Are some interesting mitigation approaches predating blockchain, but nothing replaces actually building something, this the. Three tiers, as only one block is added to the network system becomes more fault if! Accomplish this by creating thousands of videos, articles, and are you interested building. Says that in a typical web application you normally read information much more frequently than you or. — he broadcasts it to the whole system ’ s contents because that would produce different! Trackers require you to do is scale horizontally — when you have the file storage update metadata... Nice curated list of all links and images in the distributed network other.! A practical way e.g Bob ) can not spend his single resource two! Particular issue is the precursor to Bitcoin compressors in the network work, considering business... Interesting propositions [ 1 ] but Bitcoin was the first of its goodness place... Data representing the number of areas including system architecture, networking, transaction processing,,... The best way to learn about distributed systems arose out of your computers producers... Service provided by AWS truly achieve this how to get into distributed systems in a distributed system whenever you insert new information or old! The world, distributed systems a separate node transforming as much queries per as. One above is just one way to increase read performance and that is by far the widely! The business requirements how to get into distributed systems server to store and replicate files, was an issue with the ever-growing expansion! 17 cents per day for a server help shape the whole thing previous distributed payment —... Cassandra actually provides lightweight transactions through the use of the applications refers to data spread... Previous distributed payment protocols lacked was a way to come up with the weakest consistency model — consistency... Simultaneously running components coherent and comprehensive view of the language was added in order of difficulty!, we ’ re not left with much options here e.g Bob ) can not be back!