J~杰's Blog

人生就一条路，走一步有一步的景观

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背景

java.lang.OutOfMemoryError共有8种类型，其中java.lang.OutOfMemoryError: unable to create new native thread是很常见的一种，这类错误通常发生在应用试图创建新线程时。最近测试环境经常出现错误如下：

Caused by: java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:714)
at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:950)
at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1368)
at com.alibaba.dubbo.remoting.transport.dispatcher.all.AllChannelHandler.caught(AllChannelHandler.java:65)

可能原因

  1. 系统内存耗尽，无法为新线程分配内存
  2. 创建线程数超过了操作系统的限制

解决方案

  1. 排查应用是否创建了过多的线程

    通过jstack确定应用创建了多少线程？超量创建的线程的堆栈信息是怎样的？谁创建了这些线程？一旦明确了这些问题，便很容易解决。步骤如下：

    该进程内最耗费CPU的线程pid top -Hp pid

    将pid装换成十六进制 printf “%x\n” 21742

    最后用jstack查找线程堆栈信息 jstack 21711 | grep 54ee

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Posted on Edited on In

以前一直用wordpress维护博客，最近看到hexo博客的样例，觉得挺炫的，今天就准备将wordpress版本的博客迁移到hexo，然后重新梳理以前的博文。

Hexo Quick Start

Create a new post

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$ hexo new "My New Post"

More info: Writing

Run server

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$ hexo server

More info: Server

Generate static files

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$ hexo generate

More info: Generating

Deploy to remote sites

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$ hexo deploy

More info: Deployment

升级过程

依赖库更新

和正常 Node 项目一致，使用 npm 更新即可。

更新全局 hexo-cli

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npm update -g hexo-cli

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进入博客目录

查看可升级的包：

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> npm outdated
Package                  Current  Wanted  Latest  Location
hexo                       3.2.2   3.9.0   3.9.0  Kinegratii-blog
hexo-deployer-git          0.2.0   0.2.0   2.0.0  Kinegratii-blog
hexo-generator-archive     0.1.4   0.1.5   1.0.0  Kinegratii-blog
hexo-generator-category    0.1.3   0.1.3   1.0.0  Kinegratii-blog
hexo-generator-feed        1.2.0   1.2.2   2.0.0  Kinegratii-blog
hexo-generator-index       0.2.0   0.2.1   1.0.0  Kinegratii-blog
hexo-generator-searchdb    1.0.3   1.0.8   1.0.8  Kinegratii-blog
hexo-generator-sitemap     1.1.2   1.2.0   1.2.0  Kinegratii-blog
hexo-generator-tag         0.2.0   0.2.0   1.0.0  Kinegratii-blog
hexo-renderer-ejs          0.2.0   0.2.0   1.0.0  Kinegratii-blog
hexo-renderer-marked      0.2.11  0.2.11   2.0.0  Kinegratii-blog
hexo-renderer-stylus       0.3.1   0.3.3   1.1.0  Kinegratii-blog
hexo-server                0.2.0   0.2.2   1.0.0  Kinegratii-blog
hexo-symbols-count-time    0.4.4   0.4.4   0.6.1  Kinegratii-blog
hexo-wordcount             2.0.1   2.0.1   6.0.1  Kinegratii-blog

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全局安装 npm-check工具

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npm install -g npm-check

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更新所有包

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npm-check -u --registry https://registry.npm.taobao.org

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升级后的版本如下：

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"dependencies": {
  "hexo": "^3.9.0",
  "hexo-deployer-git": "^2.0.0",
  "hexo-generator-archive": "^1.0.0",
  "hexo-generator-category": "^1.0.0",
  "hexo-generator-feed": "^2.0.0",
  "hexo-generator-index": "^1.0.0",
  "hexo-generator-searchdb": "^1.0.8",
  "hexo-generator-sitemap": "^1.2.0",
  "hexo-generator-tag": "^1.0.0",
  "hexo-related-popular-posts": "^3.0.6",
  "hexo-renderer-ejs": "^1.0.0",
  "hexo-renderer-marked": "^2.0.0",
  "hexo-renderer-stylus": "^1.1.0",
  "hexo-server": "^1.0.0",
  "hexo-symbols-count-time": "^0.6.1",
  "hexo-wordcount": "^6.0.1"
}