watermark | 易学教程

kafka副本机制之数据可靠性

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一、概述　　为了提升集群的HA，Kafka从0.8版本开始引入了副本（Replica）机制，增加副本机制后，每个副本可以有多个副本，针对每个分区，都会从副本集（Assigned Replica，AR）中，选取一个副本作为Leader副本，所有读写请求都由Leader副本处理，其余的副本被称为Follwer副本，其会从Leader副本拉取消息更新到本地。因此，Follower更像是Leader的热备。　　一般情况下，同一个分区的多个副本会被均匀的分配到集群中的不同Broker上，当leader副本所在机器出现故障后会重新选举出新的leader实现故障转移。（针对副本如何分配以避免单台机器上leader过多导致集群负载均衡不均及多副本在同一机器上等问题，不再本文的讨论范围内，感兴趣的小伙伴，可以参考下kafka-reassign-partitions脚本）。二、关键术语副本：kafka对消息的冗余存储以提升容灾能力，以分区为单位。 Leader副本：每个分区都有多个副本，针对每个分区，都有一个唯一的一个Leader副本，负责该分区的读写请求处理。 Follower副本：从Leader副本拉取数据，作为Leader副本的热备。 AR：（Assigned Replica）副本集合（Leader+Follower的总和） ISR：（In-Sync Replica）同步副本集合

How to keep a watermark at the background of a web page?

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问题 I am a pega developer never spend a lot of time in working on webpage.I want to create a pdf .In Pega that will be created from a html page.i need to keep the wate mark draft as background? I tried following code but when im including it in my code it is creating as separate div and next divs are coming on the next page?and also the draft is not coming in the background middle ?` <div style="position:absolute;z-index:0;background:white;display:block;min-height:50%; min-width:50%;color:yellow;

'javac' 不是内部或外部命令,也不是可运行的程序或批处理文件.

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如果你只需要使用javac命令不需要如此复杂的！！你先把你自己新建的JAVA_HOME、CLASSPATH这两个变量和PATH变量中的JAVA_HOME%\bin;%JAVA_HOME%\jre\bin删了，然后只要在Path变量的头部添加如下路径： C:\Program Files\Java\jdk1.5.0\bin;就可以了。（不需要在添加别的了）原因很简单：你可以按照这个路径去看看有没有一个叫javac.exe的东东在bin文件夹中，环境变量Path的作用通俗点讲就是用来告诉你的电脑如何去找到这个可执行文件并执行它。如果你是初学者的话配不配置CLASSPATH环境变量都可以的，因为CLASSPATH变量是用来设定“类路径”的（其实这种方式是sun不推荐的）。设置CLASSPATH变量的目的讲白了其实是为了把别人写好的类库挪过来好将来自己用。希望对你有帮助哈，呵呵 <div class="htmledit_views" id="content_views"> <p>换了个工作环境，好吧，环境重新装一遍，遇到一个</p><h1 class="title-article" style="padding:0px;margin-top:0px;margin-bottom:0px;font-size:24px;color:rgb(51,51,51);font-family:

Java 3D: Where can I insert a “post rendering” FX?

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问题 I extended a Canvas3D and then I override the method "postSwap()", but my odd-even line effect is flickering a lot, what could be another good point for inserting this process? public void postSwap() { Graphics2D g2 = (Graphics2D)this.getGraphics(); Map map = new HashMap(); map.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF); g2.addRenderingHints(map); g2.setColor(WipideaApplet.BCK2); int h = this.getHeight(), w = this.getWidth(); for (int i=0;i<h;i++) { if (i%2==0)

iText 7 Text Watermark annotation not recognized by Adobe Reader - uneditable text

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问题 I am able to add and remove a page header using a text watermark annotation using itext 7 and C#. I am able to see and print the PDF via Adobe Acrobat Reader. @remy However, I am unable to use Adobe Acrobat Pro DC to remove the pager header. When I do a search and replace, it says text is un-editable. The PDF files are located here: PDF Files Original, With Watermark Step2 and WaterMark Removed Step3 public static string CompanyName= "ACME77"; public static string AnnotName = CompanyName +

What's the difference between SetWindowLongPtr(GWL_HWNDPARENT) and SetParent?

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问题 I need to create a watermark window(markHwnd) for some application windows on desktop, the watermark window style is: uint dwStyle = Win32API.WS_CLIPSIBLINGS | Win32API.WS_CLIPCHILDREN | Win32API.WS_POPUP; uint dwExStyle = Win32API.WS_EX_LAYERED | Win32API.WS_EX_TRANSPARENT | Win32API.WS_EX_NOACTIVATE | Win32API.WS_EX_NOPARENTNOTIFY | Win32API.WS_EX_TOOLWINDOW; markHwnd = Win32API.CreateWindowEx(dwExStyle, wndclassRegResult, ti.ToString(), dwStyle, 0, 0, 0, 0,IntPtr.Zero, IntPtr.Zero,

What's the difference between SetWindowLongPtr(GWL_HWNDPARENT) and SetParent?

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Not so Mobile UVA

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Before being an ubiquous communications gadget, a mobile was just a structure made of strings and wires suspending colourfull things. This kind of mobile is usually found hanging over cradles of small babies. The figure illustrates a simple mobile. It is just a wire, suspended by a string, with an object on each side. It can also be seen as a kind of lever with the fulcrum on the point where the string ties the wire. From the lever principle we know that to balance a simple mobile the product of the weight of the objects by their distance to the fulcrum must be equal. That is Wl × Dl = Wr

How to remove watermark from text document using openCV python?

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问题 I am new to OpenCV, I need help removing the watermark from this image, I tried using inpaint but I want a more automated way of feature mapping and inpainting, pls help me with it. 回答1: If all your images are like this and have a watermark as shown in the question having a light gray watermark then a simple thresholding operation will work. import cv2 img = cv2.imread('watermark.jpg') _, thresh = cv2.threshold(img, 150, 255, cv2.THRESH_BINARY) cv2.imshow('Result', thresh) cv2.waitKey(0) cv2

How to remove watermark from text document using openCV python?

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