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…

一 下载 confluence https://product-downloads.atlassian.com/software/confluence/downloads/atlassian-confluence-6.15.6-x64.bin jira https://product-downloads.atlassian.com/software/jira/downloads/atlassian-jira-software-8.2.2-x64.bin 二 安装 三 配置 1 如果要在confl…

hive及其他组件(比如spark.impala等)都会依赖hive metastore,依赖的配置文件位于hive-site.xml hive metastore重要配置 hive.metastore.warehouse.dirhive2及之前版本默认为/user/hive/warehouse/,创建数据库或表时会在该目录下创建对应的目录 javax.jdo.option.ConnectionURLjavax.jdo.option.ConnectionDriverNamejavax.jdo.o…

今天尝试运行一个古老的工程,配置好之后编译通过,结果运行时报错: org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [applicationContext.xml]; nested exception is java.lang.IllegalStateException: Context…

maven编译工程报错 [ERROR] Failed to execute goal net.alchim31.maven:scala-maven-plugin:3.2.2:add-source (scala-compile-first) on project trade: Execution scala-compile-first of goal net.alchim31.maven:scala-maven-plugin:3.2.2:add-source failed: Plugin net.…

问题:spark中如果有两个DataFrame(或者DataSet),DataFrameA依赖DataFrameB,并且两个DataFrame都进行了cache,将DataFrameB unpersist之后,DataFrameA的cache也会失效,官方解释如下: When invalidating a cache, we invalid other caches dependent on this cache to ensure cached data is up to date. For…

spark 2.4 spark sql中执行 set hive.exec.max.dynamic.partitions=10000; 后再执行sql依然会报错: org.apache.hadoop.hive.ql.metadata.HiveException: Number of dynamic partitions created is 1001, which is more than 1000. To solve this try to set hive.exec.max.dynamic.p…

docker container启动失败,报错:Exited (137) *** ago,比如 Exited (137) 16 seconds ago 这时通过docker logs查不到任何日志,从mesos上看stderr相关的只有一句 I0409 16:56:26.408077 8583 executor.cpp:736] Container exited with status 137 通过docker inspect查看container状态为 "State": { &quo…

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…