CCA认证介绍
CCA认证介绍
作者:尹正杰
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一.CCA认证介绍
1>.CCA概述
Cloudera Certified Associate(CCA认证)是Cloudera面向初中级Hadoop技术人员推出的认证考试。由于Cloudera的Hadoop发行版是目前使用最广泛的版本,Cloudera的认证也因此被广泛承认。能够获得这类证书的技术人员求职,企业投标等都是有重要作用的。
2>. CCA认证的方向
CCA Spark and Hadoop Developer:
学会使用Apache Spark和其他Cloudera企业级工具,实现对大户数据的集成,转换,处理。
CCA Data Analyst:
学会对原始数据进行加载,转换,清洗,建模,从而定义数据间的关系并抽取出有意义的结果。
CCA Administrator:
学会针对部署Cloudera Hadoop发行版的企业进行核心系统和集群运维的技能。
3>.CCP概述
CCA上一级的考试称为Cloudera Gertified Professional(CCP),只有一门考试CCP Data Engineer,这门考试需要综合CCA三个方向(运维,开发,分析)的技能,侧重于对整体系统和数据流的开发,相当于数据架构师的能力。
二.CCAA考试简介(CCA Administrator)
1>.CCAA考试概述
Cloudera 官方连接可参考: https://www.cloudera.com/about/training/certification/cca-admin.html https://www.cloudera.com/about/training/certification/cca-spark.html https://www.cloudera.com/about/training/courses/data-analyst-training.html 如下图所示,CCAA考试(编号CCA131)有以下注意事项: 远程在线考试(对网速和地点有要求) 考试限时120分钟(对于比较熟练的运维人员来说足够) 有8-12个(通常都是10个)需要动手操作的问题(Cloudera 企业版集群已经部署好,因此不需要部署集群,但我们集群部署中用到的很多CM操作都是会考到的) 考试通过成绩为70%(每一题指挥检查你答案正确或错误,不存在的部分正确的判断标准,因此你必须至少答对7题) 考试语言为英语(建议CM界面使用英文,免得考试的时候手生。) 考试费用为295美元(只接受信用卡支付,挂掉重考需要新交费)
2>.CCAA和旧版CCAH(Cloudera Certified Administration Hadoop) 对比
CCAA和旧版CCAH(Cloudera Certified Administration Hadoop)考试有以下区别
CCAH考试全部为单选或多选题,只考Hadoop标准组件(HDFS,MapReduce,YARN,Hive,Impala。HBase)的基本概念和配置参数,不涉及Cloudera企业版的特性和CM的操作,因此对小白来说比较有利。
CCAA考试全部为实操题,大约一半使用命令行操作,一半使用CM操作,因此会涉及Cloudera企业版的特性和CM的操作。这种考法增加了小白通过的难度,对有实践经验的人比较有利。
3>.CCAA考试流程
从Cloudera官网的入口进入报名界面并交费,如果没有Cloudera账号会让你注册,使用支付美元支付的信用卡付费。(CCAA官方付费地址:https://university.cloudera.com/content/CCA131)
预约考试时间。
按照Cloudera的考试大纲进行复习。
按照考试说明,提前登陆考试网站,进行网速测试(至少需要20M宽带,需要摄像头可以看到你,Cloudera官方的人可以通过观察你考试时的视频,比如考试时是否作弊之类的)和人工安全监测(检查你的考试环境是否合规,电脑上是否有不合适的进程)。
仔细阅读考试说明,按照要求答题(考试时一些帮助文档时可以打开的。但无法访问其他网站和聊天工具)。
全部答完后提交,马上可以看到考试结果。电子版证书一两天后会发到注册邮箱。
三.CCAA考试大纲解读
所有考试点在该Cloudera官网上都有罗列,CCAA官方考试大纲:https://www.cloudera.com/about/training/certification/cca-admin.html
但具体对应哪个官方文档的恩日哦那个,需要自行查找。比较有用的文档有:
Cloudera 官方文档:https://www.cloudera.com/documentation.html(我们可以选择你需要查看的版本)
hadoop2.6.0官方文档:http://hadoop.apache.org/docs/r2.6.0/index.html
hadoop3.0.0官方文档:http://hadoop.apache.org/docs/r3.0.0/index.html
1>.Install
Demonstrate an understanding of the installation process for Cloudera Manager, CDH, and the ecosystem projects. (1)Set up a local CDH repository (2)Perform OS-level configuration for Hadoop installation (3)Install Cloudera Manager server and agents (4)Install CDH using Cloudera Manager (5)Add a new node to an existing cluster (6)Add a service using Cloudera Manager Cloudera 安装指南参考文档:https://www.cloudera.com/documentation/enterprise/5-16-x/topics/installation.html
2>.Configure
Perform basic and advanced configuration needed to effectively administer a Hadoop cluster (1)Configure a service using Cloudera Manager (2)Create an HDFS user's home directory (3)Configure NameNode HA (4)Configure ResourceManager HA (5)Configure proxy for Hiveserver2/Impala Cloudera官方参考文档: https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cm_configuration.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/admin_ha.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/admin_ha_hiveserver2.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/impala_proxy.html
3>.Manage
Maintain and modify the cluster to support day-to-day operations in the enterprise (1)Rebalance the cluster (2)Set up alerting for excessive disk fill (3)Define and install a rack topology script (4)Install new type of I/O compression library in cluster (5)Revise YARN resource assignment based on user feedback (6)Commission/decommission a node Cloudera官方参考文档: https://www.cloudera.com/documentation/enterprise/5-16-x/topics/admin_dn_storage_balancing.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cm_dg_monitoring_settings.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cm_mc_specify_rack.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/admin_data_compression_performance.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cdh_ig_yarn_tuning.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cm_mc_managing_hosts.html
4>.Secure
Enable relevant services and configure the cluster to meet goals defined by security policy; demonstrate knowledge of basic security practices (1)Configure HDFS ACLs (2)Install and configure Sentry (3)Configure Hue user authorization and authentication (4)Enable/configure log and query redaction (5)Create encrypted zones in HDFS Cloudera官方参考文档: https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cdh_sg_hdfs_ext_acls.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/sg_sentry_overview.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/hue_sec_0.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/sg_redaction.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cdh_sg_hdfs_encryption.html
5>.Test
Benchmark the cluster operational metrics, test system configuration for operation and efficiency (1)Execute file system commands via HTTPFS (2)Efficiently copy data within a cluster/between clusters (3)Create/restore a snapshot of an HDFS directory (4)Get/set ACLs for a file or directory structure (5)Benchmark the cluster (I/O, CPU, network) Cloudera官方参考文档: https://archive.cloudera.com/cdh5/cdh/5/hadoop/hadoop-hdfs-httpfs/index.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cdh_admin_distcp_cdh5.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cm_bdr_managing_hdfs_snapshots.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cdh_sg_hdfs_ext_acls.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/admin_performance.html
6>.Troubleshoot
Demonstrate ability to find the root cause of a problem, optimize inefficient execution, and resolve resource contention scenarios (1)Resolve errors/warnings in Cloudera Manager (2)Resolve performance problems/errors in cluster operation (3)Determine reason for application failure (4)Configure the Fair Scheduler to resolve application delays Cloudera官方参考文档: https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cm_dg_about.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/admin_performance.html https://www.cloudera.com/documentation/enterprise/5-16-x/topics/cm_mc_yarn_service.html
本文来自博客园,作者:尹正杰,转载请注明原文链接:https://www.cnblogs.com/yinzhengjie/articles/11022949.html,个人微信: "JasonYin2020"(添加时请备注来源及意图备注,有偿付费)
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