<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[KKKKWH的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/KKKKWH</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; KKKKWH]]></copyright><item><title><![CDATA[SSH免密问题处理]]></title><link>https://blog.youkuaiyun.com/KKKKWH/article/details/157691771</link><guid>https://blog.youkuaiyun.com/KKKKWH/article/details/157691771</guid><author>KKKKWH</author><pubDate>Tue, 03 Feb 2026 15:57:08 +0800</pubDate><description><![CDATA[摘要：CDH集群节点迁移后出现SSH免密登录问题。主要解决两个问题：1）主机密钥变更警告，通过ssh-keygen -R命令删除本地known_hosts中对应记录；2）节点间互访需密码，通过配置SSH公钥认证解决：在host2生成密钥对，使用ssh-copy-id或手动方式将公钥添加到host1的authorized_keys文件，并设置正确权限（.ssh目录700，authorized_keys文件600）。最终实现节点间免密互访。]]></description><category></category></item><item><title><![CDATA[如何查看Hive表占用存储大小]]></title><link>https://blog.youkuaiyun.com/KKKKWH/article/details/156268481</link><guid>https://blog.youkuaiyun.com/KKKKWH/article/details/156268481</guid><author>KKKKWH</author><pubDate>Thu, 25 Dec 2025 16:23:07 +0800</pubDate><description><![CDATA[在 Hive 中查看表占用的存储大小，主要有。]]></description><category></category></item><item><title><![CDATA[Mysql用户密码修改-高效完整版本]]></title><link>https://blog.youkuaiyun.com/KKKKWH/article/details/155774994</link><guid>https://blog.youkuaiyun.com/KKKKWH/article/details/155774994</guid><author>KKKKWH</author><pubDate>Thu, 18 Dec 2025 14:46:39 +0800</pubDate><description><![CDATA[起因：安全部门审查出来某一台服务器上存在弱密码，于是要求整改。翻看之后，发现是由于Mysql用户密码过于简单造成的。]]></description><category></category></item><item><title><![CDATA[StarRocks报错解决方案Failed to find enough host in all backends. need: 3, Current alive backend is [10003]]]></title><link>https://blog.youkuaiyun.com/KKKKWH/article/details/155979433</link><guid>https://blog.youkuaiyun.com/KKKKWH/article/details/155979433</guid><author>KKKKWH</author><pubDate>Tue, 16 Dec 2025 15:21:02 +0800</pubDate><description><![CDATA[SQL 错误 [1064] [42000]: Failed to find enough host in all backends. need: 3, Current alive backend is [10003]错误原因是由于只有一台节点，没有副本，而StarRocks默认的是三副本（推荐3be集群）。我们项目测试的StarRocks组件只有一台backend节点。]]></description><category></category></item><item><title><![CDATA[hdfs 权限问题: AccessControlException: Permission denied: user=root]]></title><link>https://blog.youkuaiyun.com/KKKKWH/article/details/155614419</link><guid>https://blog.youkuaiyun.com/KKKKWH/article/details/155614419</guid><author>KKKKWH</author><pubDate>Sat, 06 Dec 2025 13:41:55 +0800</pubDate><description><![CDATA[工作中经常需要使用在服务器上使用shell脚本对HDFS文件所有者为“hdfs、hadoop”的文件做修改或删除操作。
正常情况下脚本运行在hdfs的linux宿主机，有hdfs用户，可以切换到hdfs用户再执行。
现在使用华为云主机，shell脚本运行在pod中，只有root用户，没有hdfs用户。会出现如下报错：

org.apache.hadoop.security.AccessControlException: Permission denied: user=root, access=WRITE, ]]></description><category></category></item><item><title><![CDATA[Seatunnel 2.1.3 源码打包、编译运行]]></title><link>https://blog.youkuaiyun.com/KKKKWH/article/details/128143248</link><guid>https://blog.youkuaiyun.com/KKKKWH/article/details/128143248</guid><author>KKKKWH</author><pubDate>Fri, 02 Dec 2022 10:21:32 +0800</pubDate><description><![CDATA[记录一下：Seatunnel源码修改之后，本地编译打包执行，中间遇到的问题。]]></description><category></category></item><item><title><![CDATA[Spark调优实战]]></title><link>https://blog.youkuaiyun.com/KKKKWH/article/details/104631889</link><guid>https://blog.youkuaiyun.com/KKKKWH/article/details/104631889</guid><author>KKKKWH</author><pubDate>Tue, 03 Mar 2020 15:15:23 +0800</pubDate><description><![CDATA[首先解释一下名词：



num-executors 线程数：一般设置在50-100之间，必须设置，不然默认启动的executor非常少，不能充分利用集群资源，运行速度慢

executor-memory 线程内存：参考值4g-8g,num-executor乘以executor-memory不能超过队列最大内存，申请的资源最好不要超过最大内存的1/3-1/2

executor-cores 线...]]></description><category></category></item><item><title><![CDATA[hive面试题]]></title><link>https://blog.youkuaiyun.com/KKKKWH/article/details/83068966</link><guid>https://blog.youkuaiyun.com/KKKKWH/article/details/83068966</guid><author>KKKKWH</author><pubDate>Tue, 16 Oct 2018 10:19:12 +0800</pubDate><description><![CDATA[有一张很大的表：TRLOG
该表大概有2T左右
TRLOG：
CREATE TABLE TRLOG
(PLATFORM string,
USER_ID int,
CLICK_TIME string,
CLICK_URL string)
row format delimited
fields terminated by '\t';
数据：
PLATFORM USER_ID CLICK_TIME CL...]]></description><category></category></item></channel></rss>