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Microsoft's latest browser, IE9, won a lot of praise that it seemed impossible to get before. For example, brianrakoski, Google's browser product manager, expressed appreciation for Microsoft's progress in web browsers. We welcome Microsoft's

In the evening, it was a bit cool. This is a transportation system where tickets can be shared. That is to say, when everyone is on a bus, it is enough to meet the requirements of all people to add up less time than the total face value of the

how Photoshop to the character face freckle skin smooth white Original Final effect 1, open the original material, the background layer to copy a layer. Point Channel panel, the most serious spots of the blue channel to

　　 mac computer How easy to remove Baidu promotion ads If you use Safari under a MAC, you can use the following methods to get rid of the promotion: 1. Safari + Adguard AdBlocker Even if you install the AdBlock and AdBlock plus use the default settings will not be able to block Baidu promotion, this is because AdBlock and AdBlock Plus now have some white list, these white list inside the site can be paid to remove the advertising screen. For exampl

Reprint Please specify source: http://www.cnblogs.com/skywang12345/p/3534050.htmlSemaphore IntroductionSemaphore is a count semaphore, and its essence is a "shared lock".The semaphore maintains a semaphore license set. A thread can obtain a semaphore's license by calling acquire (), and the thread can obtain the license when there is a license available in the semaphore, otherwise the thread must wait until a license is available. The thread can release () The semaphore license it holds.Semaphor

wait there, and thereafter everyone who came to the barbershop had to wait. After a period of time, after a barber has finished his haircut, the receptionist arranges for another person (fair or unfair mechanism??). ) to get a haircut. here the barber is equivalent to the public resources, the reception is equivalent to the semaphore (Semaphore), the customer is equivalent to the thread. Further, we determine that the semaphore semaphore is a nonnega

configuration, but it does not apply to shared clusters. Large applications can consume all cluster resources, which causes other applications to be blocked. In a shared cluster, it is more appropriate Capacity Scheduler to adopt or, both of Fair Scheduler these schedulers allow large tasks and small tasks to be submitted with some system resources at the same time.The following "Yarn Scheduler comparison Diagram" shows the differences between these

not applicable to shared clusters. Large applications may occupy all cluster resources, which causes blocking of other applications. More suitable for shared ClustersCapacity SchedulerOrFair SchedulerBoth schedulers allow large and small tasks to obtain certain system resources while submitting them. Below"Yarn scheduler comparison chart"The differences between these schedulers are displayed. We can see that in the FIFO scheduler, small tasks are blocked by large tasks. For the Capacity schedul

scheduler, and does not require any configuration, but it does not apply to shared clusters. Large applications can consume all cluster resources, which can cause other applications to be blocked. In a shared cluster, it is better to adopt capacity Scheduler or Fair Scheduler, both of which allow large tasks and small tasks to obtain a certain amount of system resources while submitting. The following "Yarn Scheduler contrast Diagram" shows the diffe

point. But this creates a problem because thread a already holds the lock on the object and is requesting a lock on the object, so that thread a waits for a lock that will never be acquired. And because synchronized and lock have the ability to be reentrant, so this phenomenon will not occur. 2. Can break lockInterruptible Lock: As the name suggests, is the lock that can be interrupted accordingly.In Java, synchronized is not an interruptible lock, and lock is an interruptible lock.If a thread

Get an unfair lock (based on jdk1.7.0_40)Unfair locks and fair locks the process is the same on the method of acquiring locks, and their differences are mainly expressed in the "mechanism of trying to acquire locks". Simply put, the "fair lock" is a fair policy every time it tries to acquire a lock (according to the wait queue), while the "unfair lock" is a non-

other functions, including timed lock waits, interruptible lock waits, and fair locks, and implement non-block structure locking. In addition, in earlier JDK versions, ReentrantLock still has some performance advantages. Since ReentrantLock has so many advantages, why should we use the synchronized keyword? In fact, many people use ReentrantLock to replace the lock operation of the synchronized keyword. However, the built-in lock still has its unique

This chapter is a basic introduction to the Reentrantlock package, this chapter mainly on the Reentrantlock of the general introduction, the content includes:Reentrantlock IntroductionList of Reentrantlock functionsReentrantlock ExampleIn the following two chapters, the implementation principles of the two subclasses (fair and unfair locks) of Reentrantlock are introduced respectively.Reprint Please specify source: http://www.cnblogs.com/skywang12345/

by the return value notification framework, and wake up multiple threads to achieve optimal performance by cascading the acquisition of signals. Although serialized concurrency is not commonly used (persistent storage or transformation), these classes often reverse-construct other classes, such as thread-safe collections, which are usually serialized. The Aqs and Conditionobject classes provide methods for serializing the concurrency state, but do not block threads or temporarily store them. Ev

In the ideal country, requests sent by yarn applications can be immediately responded to. In the real world, resources are limited, in aOn a busy cluster, an application often needs to wait for some of its request processing to complete. Assigning resources to applications based on predefined guidelines isYARN Scheduler's work. Scheduling is usually a difficult point, there is no "best" policy, it is yarn Why provide an optional schedulerAnd the policy to be provided. Let's take a look at it nex

All source code for this blog is from JDK 1.8 Reentrantlock, can be re-entered lock, is a recursive non-blocking synchronization mechanism. It can be equated to the use of synchronized, but Reentrantlock provides a more powerful and flexible locking mechanism than synchronized, which reduces the probability of deadlocks.The API is described below: A reentrant mutex lock lock, which has the same basic behavior and semantics as the implicit monitor lock accessed using the Synchronize

powerful than a sync lock, and it provides a framework for locks that allow for more flexibility in using locks, but it is even more difficult to use.Juc lock in package, including: Lock interface, Readwritelock interface, Locksupport blocking primitives, condition conditions, abstractownablesynchronizer/ Abstractqueuedsynchronizer/abstractqueuedlongsynchronizer three abstract classes, Reentrantlock exclusive locks, Reentrantreadwritelock read and write locks. Since Countdownlatch,cyclicbarrier

, with an "unfair policy." Reentrantreadwritelock ()//Create a new Reentrantreadwritelock,fair is a "fair strategy". Fair is true, meaning a fair strategy; otherwise, it means a non-fair strategy. Reentrantreadwritelock (Boolean Fair