<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[从现在起]]></title><description><![CDATA[一切还不晚]]></description><link>https://blog.youkuaiyun.com/wangxiaofeng0010</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; wangxiaofeng0010]]></copyright><item><title><![CDATA[上帝说：世界上要有Java]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/104678008</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/104678008</guid><author>wangxiaofeng0010</author><pubDate>Thu, 05 Mar 2020 16:39:38 +0800</pubDate><description><![CDATA[上帝说要有光于是就有了光，上帝说写Java需要工具，于是Oracle就提供了工具。

配置你的环境(Mac环境)

安装JDK（这是个啥，不用管，你就认为他是个运行Java工具，必须要有）

1. 访问Oracle官网 http://www.oracle.com，找到登录入口，如果没有账号，请先注册，具体注册步骤这里就不啰嗦了。





2. 登录后，返回到Oracle官网首页 http://...]]></description><category></category></item><item><title><![CDATA[Java 8 list 对象字段升序降序]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79729650</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79729650</guid><author>wangxiaofeng0010</author><pubDate>Wed, 28 Mar 2018 16:26:16 +0800</pubDate><description><![CDATA[原文：https://www.concretepage.com/java/jdk-8/java-8-stream-sorted-exampleStream sorted() using Natural Ordering, Comparator and Reverse OrderingFind the syntax of sorted() method. 1. sorted(): It sorts ...]]></description><category></category></item><item><title><![CDATA[elasticsearch 执行数据库in操作]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79622859</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79622859</guid><author>wangxiaofeng0010</author><pubDate>Tue, 20 Mar 2018 11:19:44 +0800</pubDate><description><![CDATA[elasticsearch 执行数据库in操作 ,如下：查_id在orgIds的数据    public void getAll(List&amp;lt;String&amp;gt; orgIds) {        SearchRequestBuilder searchRequestBuilder = client.prepareSearch(index);        searchRequestBuilde...]]></description><category></category></item><item><title><![CDATA[ORA-00001: unique constraint (XX.SYS_C0011222) violated  违反唯一约束条件]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79414573</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79414573</guid><author>wangxiaofeng0010</author><pubDate>Thu, 01 Mar 2018 16:43:51 +0800</pubDate><description><![CDATA[1.oracle 数据导入后，添加数据报错ORA-00001: unique constraint (XX.SYS_C0011222) violated  违反唯一约束条件场景：1.先创建表-- ------------------------------------------------------- Table `tq_auth_rule`-- -----------------------...]]></description><category></category></item><item><title><![CDATA[SpringBoot 使用feign时报错Service id not legal hostname]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79385901</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79385901</guid><author>wangxiaofeng0010</author><pubDate>Tue, 27 Feb 2018 11:28:29 +0800</pubDate><description><![CDATA[SpringBoot 使用feign时报错Service id not legal hostname(xx_sss）原因是feign不支持下划线&quot;_&quot;，支持&quot;-&quot;,改成xx-sss即可参考：https://github.com/spring-cloud/spring-cloud-netflix/issues/1582Does ribbon support those chars like &quot;_&quot; ...]]></description><category></category></item><item><title><![CDATA[ubuntu安装kibana]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79377426</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79377426</guid><author>wangxiaofeng0010</author><pubDate>Mon, 26 Feb 2018 15:09:31 +0800</pubDate><description><![CDATA[1.下载kibana安装包wget https://artifacts.elastic.co/downloads/kibana/kibana-5.6.5-linux-x86_64.tar.gzsha1sum kibana-5.6.5-linux-x86_64.tar.gz tar -xzf kibana-5.6.5-linux-x86_64.tar.gzcd kibana-5.6.5-linux-...]]></description><category></category></item><item><title><![CDATA[ubuntu安装elasticsearch]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79377239</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79377239</guid><author>wangxiaofeng0010</author><pubDate>Mon, 26 Feb 2018 14:58:06 +0800</pubDate><description><![CDATA[基础配置1.下载elasticsearch安装包wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.6.5.zipsha1sum elasticsearch-5.6.5.zip unzip elasticsearch-5.6.5.zip2.配置es环境变量sudo vi /etc/profileES_H...]]></description><category></category></item><item><title><![CDATA[倒排索引]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79011974</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/79011974</guid><author>wangxiaofeng0010</author><pubDate>Tue, 09 Jan 2018 13:37:58 +0800</pubDate><description><![CDATA[见其名知其意，有倒排索引，对应肯定，有正向索引。

     正向索引（forward index），反向索引（inverted index）更熟悉的名字是倒排索引。

 

     在搜索引擎中每个文件都对应一个文件ID，文件内容被表示为一系列关键词的集合（实际上在搜索引擎索引库中，关键词也已经转换为关键词ID）。例如“文档1”经过分词，提取了20个关键词，每个关键词都会记录它在文]]></description><category></category></item><item><title><![CDATA[Git仓库完整迁移 含历史记录]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78531485</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78531485</guid><author>wangxiaofeng0010</author><pubDate>Tue, 14 Nov 2017 16:00:16 +0800</pubDate><description><![CDATA[原文地址：http://blog.youkuaiyun.com/candyguy242/article/details/45920111

如果你想从别的 Git 托管服务那里复制一份源代码到新的 Git 托管服务器上的话，可以通过以下步骤来操作。

1). 从原地址克隆一份裸版本库，比如原本托管于 GitHub。

git clone –bare git://github.com/usernam]]></description><category></category></item><item><title><![CDATA[运行jar包时指定端口]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78520018</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78520018</guid><author>wangxiaofeng0010</author><pubDate>Mon, 13 Nov 2017 14:30:00 +0800</pubDate><description><![CDATA[运行jar包时指定端口





java -jar xxx.jar --server.port=8080]]></description><category></category></item><item><title><![CDATA[es x-pack更新证书]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78492814</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78492814</guid><author>wangxiaofeng0010</author><pubDate>Thu, 09 Nov 2017 19:03:35 +0800</pubDate><description><![CDATA[访问：https://register.elastic.co/xpack_register  注册信息，到邮箱中下载json文件


执行虾面操作





curl -XPUT -u elastic 'http://192.168.6.170:9200/_xpack/license?acknowledge=true' -H "Content-Type:alication/jso]]></description><category></category></item><item><title><![CDATA[MySQL索引原理及慢查询优化]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78405535</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78405535</guid><author>wangxiaofeng0010</author><pubDate>Tue, 31 Oct 2017 17:06:04 +0800</pubDate><description><![CDATA[原文地址：https://tech.meituan.com/mysql-index.html

MySQL凭借着出色的性能、低廉的成本、丰富的资源，已经成为绝大多数互联网公司的首选关系型数据库。虽然性能出色，但所谓“好马配好鞍”，如何能够更好的使用它，已经成为开发工程师的必修课，我们经常会从职位描述上看到诸如“精通MySQL”、“SQL语句优化”、“了解数据库原理”等要求。我们知道一般的应用系]]></description><category></category></item><item><title><![CDATA[深入理解abstract class和interface]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78278879</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78278879</guid><author>wangxiaofeng0010</author><pubDate>Wed, 18 Oct 2017 22:41:01 +0800</pubDate><description><![CDATA[原文地址：https://www.ibm.com/developerworks/cn/java/l-javainterface-abstract/index.html

理解抽象类

abstract class和interface在Java语言中都是用来进行抽象类（本文中的抽象类并非从abstract class翻译而来，它表示的是一个抽象体，而abstract class为Java语言]]></description><category></category></item><item><title><![CDATA[java线程池详解]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78264637</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78264637</guid><author>wangxiaofeng0010</author><pubDate>Tue, 17 Oct 2017 18:37:16 +0800</pubDate><description><![CDATA[在软件开发中，池一直都是一种非常优秀的设计思想，通过建立池可以有效的利用系统资源，节约系统性能。Java 中的线程池就是一种非常好的实现，从 JDK 1.5 开始 Java 提供了一个线程工厂 Executors 用来生成线程池，通过 Executors 可以方便的生成不同类型的线程池。但是要更好的理解使用线程池，就需要了解线程池的配置参数意义以及线程池的具体工作机制。

版权声明：本文为 咕]]></description><category></category></item><item><title><![CDATA[什么是倒排索引与正向索引]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78190811</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78190811</guid><author>wangxiaofeng0010</author><pubDate>Tue, 10 Oct 2017 11:30:07 +0800</pubDate><description><![CDATA[原文地址：http://www.wangyuwen.com/archives/1504.html




导读：索引（index）作为一种具备各种优势的数据结构，被大量应用在数据检索领域。其中倒排索引数据结构在搜索引擎框架中扮演着非常重要的角色。SEO顾问——潇湘驭文为您简单介绍倒排索引与正向索引。

对没有编程和操作数据库经验的站长和SEOer而言，索引是一种比较抽象的概念。感兴趣]]></description><category></category></item><item><title><![CDATA[Hadoop mapreduce 本地调试报错 .AccessControlException: Permission denied: user=XX]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78126644</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78126644</guid><author>wangxiaofeng0010</author><pubDate>Thu, 28 Sep 2017 17:59:16 +0800</pubDate><description><![CDATA[Hadoop mapreduce 本地调试，连接Hadoop服务器，看到hadoop log 返回：


2017-09-28 02:43:19,535 INFO org.apache.hadoop.ipc.Server: IPC Server handler 6 on 8020, call org.apache.hadoop.hdfs.protocol.ClientProtocol.mkd]]></description><category></category></item><item><title><![CDATA[hadoop高可用配置笔记]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78065910</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78065910</guid><author>wangxiaofeng0010</author><pubDate>Fri, 22 Sep 2017 18:29:13 +0800</pubDate><description><![CDATA[1.删除masters
2.删除hdfs-site.xml中的secondary配置
3.编辑hdfs-site.xml

  dfs.nameservices
  mycluster




  dfs.ha.namenodes.mycluster
  nn1,nn2




  dfs.namenode.rpc-address.mycluster.nn1
  ]]></description><category></category></item><item><title><![CDATA[Caused by: java.net.UnknownHostException: XX: XX: Temporary failure in name resolution]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78064898</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78064898</guid><author>wangxiaofeng0010</author><pubDate>Fri, 22 Sep 2017 17:02:21 +0800</pubDate><description><![CDATA[搭建 hadoop HA时，启动JournalNode，报：
java.io.IOException: java.lang.RuntimeException: Could not resolve Kerberos principal name: java.net.UnknownHostException: tq3: tq3: Temporary failure in name resolutio]]></description><category></category></item><item><title><![CDATA[hadoop live node数量正确，点击进入里面不正确]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78053588</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78053588</guid><author>wangxiaofeng0010</author><pubDate>Thu, 21 Sep 2017 16:22:39 +0800</pubDate><description><![CDATA[如题，
原因是hadoop配置集群的时候，各个节点 hostname不要设置一样的。]]></description><category></category></item><item><title><![CDATA[hadoop DataNode节点超时]]></title><link>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78053548</link><guid>https://blog.youkuaiyun.com/wangxiaofeng0010/article/details/78053548</guid><author>wangxiaofeng0010</author><pubDate>Thu, 21 Sep 2017 16:20:08 +0800</pubDate><description><![CDATA[DataNode节点超时时间设置

DataNode进程死亡或网络节点故障造成DataNode无法与NameNode通信，NameNode不会立即把该节点判定为死亡，要经过一段时间，这段时间成为超时时长。HDFS默认的超时时长为10分钟+30s。 
如果定义超时时长为timeout，则超时时长的计算公式为： 
timeout = 2 * heartbeat.recheck.interval]]></description><category></category></item></channel></rss>