centos7配置Hadoop集群环境

参考：

https://blog.csdn.net/pucao_cug/article/details/71698903 

设置免密登陆后，必须重启ssh服务

systermctl restart sshd.service

ssh服务介绍：

两种登陆方式：

1.密码登陆

2.密钥登陆

启动

http://192.168.5.130:8088/cluster

http://192.168.5.130:50070/dfshealth.html#tab-overview

安装Hadoop家族工具

hive   结合 mysql的jdbc插件    https://blog.csdn.net/pucao_cug/article/details/71773665

impala

sqoop   https://blog.csdn.net/pucao_cug/article/details/72083172

hbase  https://blog.csdn.net/pucao_cug/article/details/72229223

启动会报错

https://blog.csdn.net/l1028386804/article/details/51538611

安装zookeeper 

参考：https://blog.csdn.net/pucao_cug/article/details/72228973

zookeeper status 

原因是：myid和 zoo.cfg里的配置不匹配

hive 导入txt文件数据到表中：

create  table  student(id int,name string)  row  format  delimited  fields   terminated  by  '\t';

load   data  local   inpath   '/opt/hadoop/hive/student.txt'   into   table   db_hive_edu.student;

-- hive导入csv文件
create table table_name(
id string,
name string,
age string
)
row format serde
'org.apache.hadoop.hive.serde2.OpenCSVSerde'
with
SERDEPROPERTIES
("separatorChar"=",","quotechar"="\"")
STORED AS TEXTFILE;

load data local inpath '/opt/hadoop/hive/table_name.csv' overwrite into table table_name;

将表转换成ORC表：

create table table_name_orc(
id string,
name string,
age string
)row format delimited fields terminated by "\t" STORED AS ORC

insert overwrite table table_name_orc select * from table_name