hadoop prerequisites

:0e375822c41300c9cbd14ddf21e97e91f6fed3f5Direct address: Http://download.microsoft.com/download/4/3/3/4330912d-79ae-4037-8a55-7a8fc6b5eb68/buildtools_full.exeVisual C + + Build Tools Update 3 (x86 and x64)-Web Installer (中文版)Release Date: 2016/6/27File name: En_visual_cpp_build_tools_2015_update_3_x86_x64_8923157.exeLanguage: 中文版sha1:3e0de8af516c15547602977db939d8c2e44fcc0bDirect address: Http://download.microsoft.com/download/5/f/7/5f7acaeb-8363-451f-9425-68a90f98b238/visualcppbuildtools_full.e

object by defaultForm Object . Submit ()The number is an instance object belonging to the array, which is an instance object belonging to the array, and the string is an instance object of String. Null is an instance object that belongs to14. 3 ways to bind events:HTML event handler,DOM0 level,DOM2 levelThe disadvantage of the DOM0 level: cannot bind multiple, if the binding multiple, the subsequent event will overwrite the previous eventThe difference between 15.== and = = == = value Equal

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than the old guns, I also very much admire. Take a look at their website, read their blog and feel it. To dare to find more than their own small or small, but more than their excellent people learn, because they really realize the curve overtaking, itself is the best "dry". BTW, if you have a personal website, you can get some extra points.5. Skills"Know Daniel to communicate and then get the opportunity to push" this skill is not much to say, focus on recruitment opportunities, and senior comm

The first kind, in the English meaning1. The North interface is the top level abstraction interface of a module;2. The South interface is the interface of the internal sub-module of a module;The second, according to my understanding, the North interface is equivalent to the interface between Rosng and FTM, the south is equivalent to the interface between the FTM and the chipThe third, according to my understanding between the application layer and the data management layer is the north, the data

. Therefore, deadlock detection and recovery methods are often used in the actual operating system to eliminate deadlocks.Deadlock detection and recovery refers to the system has a special mechanism, when the deadlock occurs, the mechanism can detect the location and cause of the deadlock, and can destroy the necessary conditions of the deadlock through external forces, so that the concurrent process from the deadlock state recovery.This article is from the "July boreas" blog, please be sure to

, which is usually composed of function code class and related files, and communicates with other components to complete the corresponding level function. 3) Four levelsCustomer TierClient: The portion of the presentation layer that interacts with the user.server-side: Java Application Server, responsible for deployment Web Components and EJB components that provide basic services for these components, while allowing clients to access these componentsPresentation LayerJSP: is a "view" component

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I. prerequisites-program memory allocation The memory occupied by a C/C ++ compiled program is divided into the following parts: 1. STACK: the stack zone is automatically allocated and released by the compiler, and stores function parameter values and local variable values. The operation method is similar to the stack in the data structure. 2. Heap-generally assigned and released by the programmer. If the programmer does not release the heap, it ma

socket. For TCP and UDP, its default value is usually 2048. B) The write part of the connection is closed. Write operations on such a socket will generate a sigpipe signal. C) The non-blocking connect socket has established a connection, or the connection has ended in failure. D) There is a socket error to be processed. Write operations on such a socket will not be blocked and return-1 (that is, an error is returned), and errno is set to an exact error condition. You can also call getsockopt

repeated multi-factor variance analysis in cells: normality and variance homogeneity are not considered, because normality and variance homogeneity are the basic unit of cells, and each cell has only one data, therefore, it cannot be analyzed. 3. Multi-factor variance analysis with duplicate data in cells: Generally, the data volume is small, so Normality Test and variance uniformity test have no practical significance. (5) simple correlation analysis 1. the Pearson method requires that all var

1. Why does the collection class not implement the cloneable and serializable interfaces?The semantics and meanings of cloning (cloning) or serialization (serialization) are related to specific implementations. Therefore, the specific implementation of the collection class should determine how to be cloned or serialized.What is the difference between 2.Iterator and listiterator?The iterator can be used to traverse the set and list collection, but Listiterator can only traverse the list.Iterator

CSS pixels = 1 device pixels. For example, for 640*960 's iphone, we can make 640*960 pages, and there will be no scroll bars on the iphone. Of course, for other devices, you also need to make different sizes of pages, so this approach is often used media queries to form a responsive page. This scenario can be perfectly presented at a specific resolution, but as more resolutions are compatible, the cost is higher because individual code needs to be written for each resolution. Here's a simple e

1) Mutex condition : A resource cannot be used by another process for a period of time when it is in use. 2) request and hold condition : means that the process has maintained at least one resource, but a new resource request has been made, and the resource has been occupied by another process, at which time the request process is blocked, but the other resources that you have obtained remain. 3) non-deprivation conditions : Refers to the process has been obtained resources, before the end of

Firefox, more plug-ins (recommended for daily use and development of two separate browser, the company's internal management environment, test environment, etc. added to the development of the browser collection and display in the address bar, so that each time you do not have to enter the URL) mail client software, such as Foxmail Communication software Network disk Second, optional software Front-end editor, such as Webstorm Screenshot software, highly recommende

some error messages such as output until you close it. But adding a "" symbol behind the command causes bash to run the program in the background: Firefox Conditional executionYou can also run two commands with bash, one after the other. The second command runs only when the first command is successfully completed. To do this, separate the two commands in the same line with a "".For example, the "Sleep" command takes a parameter in seconds and then the countdown, allowing the end

　　#集合b=Set()" "1. Add Action Add2. Delete operation (Remove,discard,pop)3. Empty (Clear)4． Intersection , and set |, difference set-, symmetric difference ^, subset (included) " "#队列import Queue" "A=queue. Queue () Queue.qsize () returns the size of Queue.empty () if the queue is empty, returns true if the queue is full, and returns True if the queues are filled, and vice versa falsequeue.full with the Falsequeue.full MaxSize size corresponds to Queue.put (item) write queue, timeout wait time" "

Linux command, you can: Grep-n Wlan0 wireless when using the-n parameter, the grep command displays matching lines and line numbers. You can also use the-e parameter, where the command will treat pattern as a regular expression. Iptables commands on-demand hardware is protecting your network, but that doesn't mean you don't need to understand the most effective security tool--iptables in the data center area. This is a fairly complex Linux command that takes a lot of time to master, and the bas

entire system?2. High concurrency, how our system supports a large number of requests3. How the cluster synchronizes session state4. principle of load balancing5. If there is a particularly large amount of traffic to the database, how to do optimization (db design, dbio,sql optimization, Java optimization)6. If there is a large area of concurrency, on the basis of not increasing the server, how to resolve the server response is not timely problems. "7. If your project has a performance bottlene

various transaction monitoring.11. JTS (Java Transaction Service):JTS is the basic realization of CORBA OTS transaction monitoring. The JTS specifies how the transaction manager is implemented. The transaction manager is a Java image that supports the Java Transaction API (JTA) specification at the top level and implements the OMG OTS specification in the lower layer. The JTS transaction Manager provides transactional services for application server, Resource Manager, standalone applications, a