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<div class="container">
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<div class="col-md-9">
<ul class="p-articles">
<li><article class="li">
<header>
<ul class="p-facts">
<li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2024-05-22T12:00:00JST">2024-05-22</time></li>
<li><i class="fa fa-bookmark" aria-hidden="true"></i><a href="https://coldwalker.github.io/post/">post</a></li>
</ul>
<h2 class="title"><a href="https://coldwalker.github.io/2024/05/mtu_probe_details/">关于MTU探测的一些细节</a></h2>
</header>
<a href="https://coldwalker.github.io/2024/05/mtu_probe_details/" class="thumb" title="关于MTU探测的一些细节" style="background-image: url(https://coldwalker.github.io/images/mtu_probe_details/sailimuhu.jpg);"></a>
<div class="summary">好久没有更新博客了，由于工作内容的调整，所负责的服务更多需要面向用户侧网络来推进，由于公网链路的复杂性，各种奇怪的网络问题也陆续接触到，抽空</div>
<footer>
<a href="https://coldwalker.github.io/2024/05/mtu_probe_details/" title="关于MTU探测的一些细节">Read More…</a>
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</article></li>
<li><article class="li">
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<ul class="p-facts">
<li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2020-01-22T12:00:00JST">2020-01-22</time></li>
<li><i class="fa fa-bookmark" aria-hidden="true"></i><a href="https://coldwalker.github.io/post/">post</a></li>
</ul>
<h2 class="title"><a href="https://coldwalker.github.io/2020/01/log4j-thread-blocked-issue/">记log4j打印异常日志导致线程阻塞的问题排查</a></h2>
</header>
<a href="https://coldwalker.github.io/2020/01/log4j-thread-blocked-issue/" class="thumb" title="记log4j打印异常日志导致线程阻塞的问题排查" style="background-image: url(https://coldwalker.github.io/images/log4j_thread_blocked_issue/chaoyanggongyuan001.jpg);"></a>
<div class="summary">最近线上一个服务偶发单机接口耗时飙升的现象，伴随着内存使用增长并出现吃swap的情况，16核的系统load也飙升到50以上，IOUtil接近</div>
<footer>
<a href="https://coldwalker.github.io/2020/01/log4j-thread-blocked-issue/" title="记log4j打印异常日志导致线程阻塞的问题排查">Read More…</a>
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</article></li>
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<li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2019-02-27T11:00:00JST">2019-02-27</time></li>
<li><i class="fa fa-bookmark" aria-hidden="true"></i><a href="https://coldwalker.github.io/post/">post</a></li>
</ul>
<h2 class="title"><a href="https://coldwalker.github.io/2019/02/gc_problem_resolve/">Java垃圾回收浅析(4)-GC常见问题分析</a></h2>
</header>
<a href="https://coldwalker.github.io/2019/02/gc_problem_resolve/" class="thumb" title="Java垃圾回收浅析(4)-GC常见问题分析" style="background-image: url(https://coldwalker.github.io/images/gc_problem_resolve/yinxing.jpg);"></a>
<div class="summary">常见的几种GC问题 回顾一下：上面几篇先讲到了java对象内存分配过程、然后总结了几种GC方式和常见的GC算法原理，也基本了解了GC日志怎么看</div>
<footer>
<a href="https://coldwalker.github.io/2019/02/gc_problem_resolve/" title="Java垃圾回收浅析(4)-GC常见问题分析">Read More…</a>
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</article></li>
<li><article class="li">
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<li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2019-02-25T16:00:00JST">2019-02-25</time></li>
<li><i class="fa fa-bookmark" aria-hidden="true"></i><a href="https://coldwalker.github.io/post/">post</a></li>
</ul>
<h2 class="title"><a href="https://coldwalker.github.io/2019/02/gc_log_analyze/">Java垃圾回收浅析(3)-GC日志分析</a></h2>
</header>
<a href="https://coldwalker.github.io/2019/02/gc_log_analyze/" class="thumb" title="Java垃圾回收浅析(3)-GC日志分析" style="background-image: url(https://coldwalker.github.io/images/gc_log_analyze/tuanjiehugongyuan.jpg);"></a>
<div class="summary">控制GC日志打印的常用配置项 -XX:+PrintGCDetails 启用详细GC日志模式。和-XX:+PrintGC的普通日志模式相比，详细日志模式会把：使用的垃圾回收器、整个堆</div>
<footer>
<a href="https://coldwalker.github.io/2019/02/gc_log_analyze/" title="Java垃圾回收浅析(3)-GC日志分析">Read More…</a>
</footer>
</article></li>
<li><article class="li">
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<li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2019-02-19T17:00:00JST">2019-02-19</time></li>
<li><i class="fa fa-bookmark" aria-hidden="true"></i><a href="https://coldwalker.github.io/post/">post</a></li>
</ul>
<h2 class="title"><a href="https://coldwalker.github.io/2019/02/gc_intro/">Java垃圾回收浅析(2)-GC方式介绍</a></h2>
</header>
<a href="https://coldwalker.github.io/2019/02/gc_intro/" class="thumb" title="Java垃圾回收浅析(2)-GC方式介绍" style="background-image: url(https://coldwalker.github.io/images/gc_intro/changlonghaiyangwangguoyanhua.jpg);"></a>
<div class="summary">为什么需要GC？ 当程序创建对象、数组等引用类型实体时，系统都会在堆内存中为之分配一块内存区，对象就保存在这块内存区中，当这块内存不再被任何引</div>
<footer>
<a href="https://coldwalker.github.io/2019/02/gc_intro/" title="Java垃圾回收浅析(2)-GC方式介绍">Read More…</a>
</footer>
</article></li>
<li><article class="li">
<header>
<ul class="p-facts">
<li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2019-02-14T15:40:00JST">2019-02-14</time></li>
<li><i class="fa fa-bookmark" aria-hidden="true"></i><a href="https://coldwalker.github.io/post/">post</a></li>
</ul>
<h2 class="title"><a href="https://coldwalker.github.io/2019/02/gc_object_alloc_process/">Java垃圾回收浅析(1)-对象内存申请</a></h2>
</header>
<a href="https://coldwalker.github.io/2019/02/gc_object_alloc_process/" class="thumb" title="Java垃圾回收浅析(1)-对象内存申请" style="background-image: url(https://coldwalker.github.io/images/gc_object_alloc_process/yurenmatou.jpg);"></a>
<div class="summary">Java虚拟机内存管理 和C/C++语言不同，Java通过虚拟机来对内存进行自动管理，避免了手动申请和释放内存的繁琐以及容易出错的问题，Jav</div>
<footer>
<a href="https://coldwalker.github.io/2019/02/gc_object_alloc_process/" title="Java垃圾回收浅析(1)-对象内存申请">Read More…</a>
</footer>
</article></li>
<li><article class="li">
<header>
<ul class="p-facts">
<li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2018-12-03T11:30:00JST">2018-12-03</time></li>
<li><i class="fa fa-bookmark" aria-hidden="true"></i><a href="https://coldwalker.github.io/post/">post</a></li>
</ul>
<h2 class="title"><a href="https://coldwalker.github.io/2018/12/troubleshooter_directbytebuffer_memory_issue/">DirectByteBuffer堆外内存溢出问题排查</a></h2>
</header>
<a href="https://coldwalker.github.io/2018/12/troubleshooter_directbytebuffer_memory_issue/" class="thumb" title="DirectByteBuffer堆外内存溢出问题排查" style="background-image: url(https://coldwalker.github.io/images/troubleshooter_directbytebuffer_memory_issue/thumb.jpg);"></a>
<div class="summary">前情提要 最近线上一个图片服务在使用ehcache的diskcache替代旧版“自实现”的磁盘缓存时，发生了java进程常驻内存暴涨导致部署机</div>
<footer>
<a href="https://coldwalker.github.io/2018/12/troubleshooter_directbytebuffer_memory_issue/" title="DirectByteBuffer堆外内存溢出问题排查">Read More…</a>
</footer>
</article></li>
<li><article class="li">
<header>
<ul class="p-facts">
<li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2018-08-15T16:30:00JST">2018-08-15</time></li>
<li><i class="fa fa-bookmark" aria-hidden="true"></i><a href="https://coldwalker.github.io/post/">post</a></li>
</ul>
<h2 class="title"><a href="https://coldwalker.github.io/2018/08/troubleshooter_native_memory_increase/">Java堆外内存增长问题排查Case</a></h2>
</header>
<a href="https://coldwalker.github.io/2018/08/troubleshooter_native_memory_increase/" class="thumb" title="Java堆外内存增长问题排查Case" style="background-image: url(https://coldwalker.github.io/images/IMG_6127.JPG);"></a>
<div class="summary">最近排查一个线上java服务常驻内存异常高的问题，大概现象是：java堆Xmx配置了8G，但运行一段时间后常驻内存RES从5G逐渐增长到13</div>
<footer>
<a href="https://coldwalker.github.io/2018/08/troubleshooter_native_memory_increase/" title="Java堆外内存增长问题排查Case">Read More…</a>
</footer>
</article></li>
<li><article class="li">
<header>
<ul class="p-facts">
<li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2018-03-21T16:51:44JST">2018-03-21</time></li>
<li><i class="fa fa-bookmark" aria-hidden="true"></i><a href="https://coldwalker.github.io/post/">post</a></li>
</ul>
<h2 class="title"><a href="https://coldwalker.github.io/2018/03/troubleshooter_stackoverflowerror/">StackOverFlowError问题引出的JVM栈内存管理</a></h2>
</header>
<a href="https://coldwalker.github.io/2018/03/troubleshooter_stackoverflowerror/" class="thumb" title="StackOverFlowError问题引出的JVM栈内存管理" style="background-image: url(https://coldwalker.github.io/images/yalaxueshan.jpg);"></a>
<div class="summary"><p>最近项目中在使用javacv时在加载jar中的so共享链接库时出现了StackOverFlowError，最终原因是由于jvm启动时指定的最大栈内存Xss的大小不够，从而导致线程栈溢出。</p></div>
<footer>
<a href="https://coldwalker.github.io/2018/03/troubleshooter_stackoverflowerror/" title="StackOverFlowError问题引出的JVM栈内存管理">Read More…</a>
</footer>
</article></li>
<li><article class="li">
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<ul class="p-facts">
<li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2018-03-21T15:43:14JST">2018-03-21</time></li>
<li><i class="fa fa-bookmark" aria-hidden="true"></i><a href="https://coldwalker.github.io/post/">post</a></li>
</ul>
<h2 class="title"><a href="https://coldwalker.github.io/2018/03/robust-service_hystrix/">服务稳定性提升之-熔断组件Hystrix</a></h2>
</header>
<a href="https://coldwalker.github.io/2018/03/robust-service_hystrix/" class="thumb" title="服务稳定性提升之-熔断组件Hystrix" style="background-image: url(https://coldwalker.github.io/images/qieyifengjing.jpg);"></a>
<div class="summary"><p>Hystrix是netflix公司开源的一个通用系统保护框架，提供服务对远程依赖的快速失败机制、requestCache支持、请求合并能力等。目前通讯这边已经大范围使用，并结合profile日志进行了一些简单的定制化，目前使用情况看，实用性和稳定性比较出色，接入成本也较低。有兴趣的组可以参考以下范例尝试接入使用。</p></div>
<footer>
<a href="https://coldwalker.github.io/2018/03/robust-service_hystrix/" title="服务稳定性提升之-熔断组件Hystrix">Read More…</a>
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