mysql内存设置,首先要知道当前的设置 MySQL [(none)]> show variables like '%buffer%'; +-------------------------------------+----------------+ | Variable_name | Value | +-------------------------------------+----------------+ | bulk_insert_buffer_size | 8388608 | | i…

查看当前时区 > show variables like '%time_zone%'; +------------------+--------+ | Variable_name | Value | +------------------+--------+ | system_time_zone | UTC | | time_zone | SYSTEM | +------------------+--------+ 2 rows in set (0.00 sec) 临时修改时区 > set t…

前言 之前也分享过很多工作中踩坑的经验: 一个线上问题的思考:Eureka注册中心集群如何实现客户端请求负载及故障转移? [原创]经验分享:一个Content-Length引发的血案(almost....) 今天再来分享工作中一个真实的案例: 商品评价列表页,显示每条用户的评价详情,为了保护用户隐私,要求显示用户昵称时只能显示第一位和最后一位,其他的用※代替. 例如输入:,输出:*** 看似一个平淡无奇的需求,我也没有太在意.服务端将用户的评论信息存储到db中,评价列表接口就是将数据库中该商品的…

cloudera manager安装hue后想开启访问mysql(librdbms)需要在这里配置(hue_safety_valve.ini) 添加配置如下 [librdbms] # The RDBMS app can have any number of databases configured in the databases # section. A database is known by its section name # (IE sqlite, mysql, psql, and o…

hue中使用hue用户(hue admin)访问hdfs报错: Cannot access: /. Note: you are a Hue admin but not a HDFS superuser, "hdfs" or part of HDFS supergroup, "supergroup". 其他症状:oozie editor页面卡住不动 检查过程如下: 1 hdfs配置 hadoop.proxyuser.hue.hosts=*hadoop.proxyuse…

Mysql driver下载:https://mvnrepository.com/artifact/mysql/mysql-connector-java import java.sql.*; public class SqlServerTest { public static void main(String []args) { String driverName="com.mysql.jdbc.Driver"; String dbURL="jdbc:mysql://$ip:…

hive和mysql数据互导,首先想到的是sqoop,并且可以和调度框架(比如oozie等)配合配置定时任务,还有一种更简单的方式是通过spark-sql: CREATE OR REPLACE TEMPORARY VIEW tmp_tbl_test USING org.apache.spark.sql.jdbc OPTIONS ( url "jdbc:mysql://1.1.1.1:3306/db_test?useUnicode=true&characterEncoding=utf-8&…

hue启动coordinator时报错,页面返回undefinied错误框: 后台日志报错: runcpserver.log [13/May/2019 04:34:55 -0700] middleware INFO Processing exception: 'NoneType' object has no attribute 'is_superuser': Traceback (most recent call last): File "/opt/cloudera/parcels/CDH-5.…

/opt/cloudera/parcels/CDH/lib/hue/apps/beeswax/src/beeswax/conf.py # Deprecated DOWNLOAD_CELL_LIMIT = Config( key='download_cell_limit', default=10000000, type=int, help=_t('A limit to the number of cells (rows * columns) that can be downloaded from…

kerberos安装详见:https://www.cnblogs.com/barneywill/p/10394164.html 一 为CM创建用户 # kadmin.local -q "addprinc scm/admin" 名字和密码任意,后续配置中会使用 二 CM配置过程 1 启用Kerberos 2 全部选中 3 按照/etc/krb5.conf填写 4 5 填写刚才创建的用户名密码 6 下一步 7 下一步 8 可以查看cm创建的用户 # kadmin.local -q 'lis…