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test
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</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2024/11/17/flink/test/" target="_self">
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asdfasf sdf
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<time datetime="2024-11-17 17:10" pubdate>
2024-11-17
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<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h2 class="index-header">
<a href="/2024/06/05/Netty/3.10-Netty%E7%9A%84FastThreadLocal/" target="_self">
3.10-Netty的FastThreadLocal
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2024/06/05/Netty/3.10-Netty%E7%9A%84FastThreadLocal/" target="_self">
<div>
1 ThreadLocal存在的问题ThreadLocalMap使用线性探测法存储ThreadLocal对象及其维护的数据，具体操作逻辑如下： 假设有一个新的ThreadLocal对象，通过hash计算它应存储的位置下标为x。 此时发现下标x对应位置已经存储了其他的ThreadLocal对象，则它会往后寻找，步长为1，下标变更为x+1。 接下来发现下标x+1对应位置也已经存储了其他的Thread
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<i class="iconfont icon-date"></i>
<time datetime="2024-06-05 00:00" pubdate>
2024-06-05
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<span class="category-chains">
<span class="category-chain">
<a href="/categories/%E6%8A%80%E6%9C%AF%E6%A1%86%E6%9E%B6/" class="category-chain-item">技术框架</a>
</span>
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<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/Netty/">#Netty</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h2 class="index-header">
<a href="/2024/06/05/Netty/4.1-Netty%E7%9A%84%E5%8F%82%E6%95%B0%E4%BB%8B%E7%BB%8D/" target="_self">
4.1-Netty的参数介绍
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2024/06/05/Netty/4.1-Netty%E7%9A%84%E5%8F%82%E6%95%B0%E4%BB%8B%E7%BB%8D/" target="_self">
<div>
1 系统参数调优1.1 Linux系统参数1.1.1 单个TCP句柄打开Socket句柄数量限制进行TCP连接时，系统为每个TCP连接创建一个socket句柄，也就是一个文件句柄，但是Linux对每个进程打开的文件句柄数量做了限制，如果超出：报错“Too many open file” 。使用ulimit-n [xxx]可临时修改（注意： ulimit命令修改的数值只对当前登录用户的目前使用环境有
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<time datetime="2024-06-05 00:00" pubdate>
2024-06-05
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<i class="iconfont icon-category"></i>
<span class="category-chains">
<span class="category-chain">
<a href="/categories/%E6%8A%80%E6%9C%AF%E6%A1%86%E6%9E%B6/" class="category-chain-item">技术框架</a>
</span>
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<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/Netty/">#Netty</a>
</div>
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</article>
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<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h2 class="index-header">
<a href="/2024/06/05/Netty/4.2-Netty%E4%BD%BF%E7%94%A8%E7%A4%BA%E4%BE%8B/" target="_self">
4.2-Netty使用示例
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2024/06/05/Netty/4.2-Netty%E4%BD%BF%E7%94%A8%E7%A4%BA%E4%BE%8B/" target="_self">
<div>
1 Netty客户端代码12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989
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<time datetime="2024-06-05 00:00" pubdate>
2024-06-05
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<a href="/categories/%E6%8A%80%E6%9C%AF%E6%A1%86%E6%9E%B6/" class="category-chain-item">技术框架</a>
</span>
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<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/Netty/">#Netty</a>
</div>
</div>
</article>
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<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h2 class="index-header">
<a href="/2024/06/05/Netty/4.3-Netty%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F%E6%A3%80%E6%B5%8B/" target="_self">
4.3-Netty内存泄漏检测
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2024/06/05/Netty/4.3-Netty%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F%E6%A3%80%E6%B5%8B/" target="_self">
<div>
1 内存泄漏检测Netty也自带了内存泄漏检测工具，可用于检测出ByteBuf对象被GC回收，但ByteBuf管理的内存没有释放的情况，但不适用ByteBuf对象还没被GC回收内存泄漏的情况，例如任务队列积压 为了便于用户发现内存泄露，Netty提供4个检测级别： disabled 完全关闭内存泄露检测 simple 以约1%的抽样率检测是否泄露，默认级别 advanced 抽样率同simple
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<div class="post-meta mr-3">
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<time datetime="2024-06-05 00:00" pubdate>
2024-06-05
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<i class="iconfont icon-category"></i>
<span class="category-chains">
<span class="category-chain">
<a href="/categories/%E6%8A%80%E6%9C%AF%E6%A1%86%E6%9E%B6/" class="category-chain-item">技术框架</a>
</span>
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<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/Netty/">#Netty</a>
</div>
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</article>
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<h2 class="index-header">
<a href="/2024/06/04/Netty/3.9-Netty%E7%9A%84%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/" target="_self">
3.9-Netty的设计模式
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2024/06/04/Netty/3.9-Netty%E7%9A%84%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/" target="_self">
<div>
1 单例模式单例模式是最常见的设计模式，它可以保证全局只有一个实例，避免线程安全问题。单例模式有很多种实现方法，其中我比较推荐三种最佳实践：双重检验锁、静态内部类方式、饿汉方式和枚举方式，其中双重检验锁和静态内部类方式属于懒汉式单例，饿汉方式和枚举方式属于饿汉式单例。 2 工厂方法模式工厂模式封装了对象创建的过程，使用者不需要关心对象创建的细节。在需要生成复杂对象的场景下，都可以使用工厂模式实现。
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<a href="/2024/06/03/Netty/3.1-Netty%E5%BC%95%E7%94%A8%E8%AE%A1%E6%95%B0%E6%9C%BA%E5%88%B6/" target="_self">
3.1-Netty引用计数机制
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1 介绍引用计数是一种常用的内存管理机制，是指将资源的被引用次数保存起来，当被引用次数变为零时就将其释放的过程。Netty在4.x版本开始使用引用计数机制进行部分对象的管理，其实现思路并不是特别复杂，它主要涉及跟踪某个对象被引用的次数。在Netty具体代码中需要通过引用计数进行内存管理的对象，会基于ReferenceCounted接口实现，其中引用计数大于0时则代表该对象被引用不会释放，当引用计数
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<a href="/2024/06/03/Netty/3.2-Netty%E5%BF%83%E8%B7%B3%E6%9C%BA%E5%88%B6/" target="_self">
3.2-Netty心跳机制
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1 TCP 保活机制Netty 是 基于 TCP 协议开发的，在四层协议 TCP 协议的实现中也提供了 keepalive 报文用来探测对端是否可用。TCP 层将在定时时间到后发送相应的 KeepAlive 探针以确定连接可用性。tcp-keepalive，操作系统内核支持，但是不默认开启, 应用需要自行开启，开启之后有三个参数会生效，来决定一个 keepalive 的行为。 123Copynet
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3.3-Netty的零拷贝
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1 传统 Linux 中的零拷贝技术1.1 初始所谓零拷贝，就是在数据操作时，不需要将数据从一个内存位置拷贝到另外一个内存位置，这样可以减少一次内存拷贝的损耗，从而节省了 CPU 时钟周期和内存带宽。 从文件中读取数据，然后将数据传输到网络上，那么传统的数据拷贝过程从数据读取到发送一共经历了四次数据拷贝，具体流程如下： 当用户进程发起 read() 调用后，上下文从用户态切换至内核态。DMA 引
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3.4-Netty的定时任务时间轮
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1 时间轮原理分析如下图所示，时间轮可以理解为一种环形结构，像钟表一样被分为多个 slot 槽位。每个 slot 代表一个时间段，每个 slot 中可以存放多个任务，使用的是链表结构保存该时间段到期的所有任务。时间轮通过一个时针随着时间一个个 slot 转动，并执行 slot 中的所有到期任务。 任务是如何添加到时间轮当中的呢？可以根据任务的到期时间进行取模，然后将任务分布到不同的 slot 中
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