Eight of hive learning notes: sqoop

Programmer Xin Chen 2021-04-16 15:30:55
hive learning notes sqoop


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About Sqoop

Sqoop yes Apache Open source project , Used in Hadoop And relational databases to efficiently transfer large amounts of data , This article will work with you to practice the following :

  1. Deploy Sqoop
  2. use Sqoop take hive Table data export to MySQL
  3. use Sqoop take MySQL Data import to hive surface

Deploy

  1. stay hadoop Download the home directory of the account Sqoop Of <font color="blue">1.4.7</font> edition :
wget https://mirror.bit.edu.cn/apache/sqoop/1.4.7/sqoop-1.4.7.bin__hadoop-2.6.0.tar.gz
  1. decompression :
tar -zxvf sqoop-1.4.7.bin__hadoop-2.6.0.tar.gz
  1. Unzip and get the folder <font color="blue">sqoop-1.4.7.bin__hadoop-2.6.0</font>, take <font color="red">mysql-connector-java-5.1.47.jar</font> Copied to the <font color="blue">sqoop-1.4.7.bin__hadoop-2.6.0/lib</font> Under the table of contents
  2. Entry directory <font color="blue">sqoop-1.4.7.bin__hadoop-2.6.0/conf</font>, take <font color="red">sqoop-env-template.sh</font> Renamed as <font color="blue">sqoop-env.sh</font>:
mv sqoop-env-template.sh sqoop-env.sh
  1. Open it with an editor <font color="blue">sqoop-env.sh</font>, Add the following three configurations ,<font color="red">HADOOP_COMMON_HOME</font> and <font color="red">HADOOP_MAPRED_HOME</font> Is a full hadoop route ,<font color="red">HIVE_HOME</font> Is a full hive route :
export HADOOP_COMMON_HOME=/home/hadoop/hadoop-2.7.7
export HADOOP_MAPRED_HOME=/home/hadoop/hadoop-2.7.7
export HIVE_HOME=/home/hadoop/apache-hive-1.2.2-bin
  1. Installation and configuration is complete , Get into <font color="blue">sqoop-1.4.7.bin__hadoop-2.6.0/bin</font>, perform <font color="blue">./sqoop version</font> see sqoop edition , As shown below , It can be seen that 1.4.7 edition ( Some environment variables are not configured to output alarms , Let's ignore ):
[[email protected] bin]$ ./sqoop version
Warning: /home/hadoop/sqoop-1.4.7.bin__hadoop-2.6.0/bin/../../hbase does not exist! HBase imports will fail.
Please set $HBASE_HOME to the root of your HBase installation.
Warning: /home/hadoop/sqoop-1.4.7.bin__hadoop-2.6.0/bin/../../hcatalog does not exist! HCatalog jobs will fail.
Please set $HCAT_HOME to the root of your HCatalog installation.
Warning: /home/hadoop/sqoop-1.4.7.bin__hadoop-2.6.0/bin/../../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
Warning: /home/hadoop/sqoop-1.4.7.bin__hadoop-2.6.0/bin/../../zookeeper does not exist! Accumulo imports will fail.
Please set $ZOOKEEPER_HOME to the root of your Zookeeper installation.
20/11/02 12:02:58 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7
Sqoop 1.4.7
git commit id 2328971411f57f0cb683dfb79d19d4d19d185dd8
Compiled by maugli on Thu Dec 21 15:59:58 STD 2017
  • sqoop After installation , Next, experience its function

MySQL Get ready

For the next battle , Need to put MySQL Get ready , What is given here MySQL For your reference :

  1. MySQL edition :5.7.29
  2. MySQL The server IP:192.168.50.43
  3. MySQL Service port :3306
  4. account number :root
  5. password :123456
  6. Database name :sqoop

About MySQL Deploy , I'm trying to save time , Yes, it is docker The deployment of , Reference resources 《 Synology DS218+ Deploy mysql》

from hive Import MySQL(export)

  • Execute the following command , take hive Data imported to MySQL:
./sqoop export \
--connect jdbc:mysql://192.168.50.43:3306/sqoop \
--table address \
--username root \
--password 123456 \
--export-dir '/user/hive/warehouse/address' \
--fields-terminated-by ','
  • see <font color="blue">address</font> surface , The data has been imported :

 Insert picture description here

from MySQL Import hive(import)

  1. stay hive In command line mode, execute the following statements , New name is address2 Table structure and address As like as two peas :
create table address2 (addressid int, province string, city string)
row format delimited
fields terminated by ',';
  1. Execute the following command , take MySQL Of address The data of the table is imported into hive Of address2 surface ,<font color="red">-m 2</font> Said to start 2 individual map Mission :
./sqoop import \
--connect jdbc:mysql://192.168.50.43:3306/sqoop \
--table address \
--username root \
--password 123456 \
--target-dir '/user/hive/warehouse/address2' \
-m 2
  1. After execution , Console input is similar to the following :
 Virtual memory (bytes) snapshot=4169867264
Total committed heap usage (bytes)=121765888
File Input Format Counters 
Bytes Read=0
File Output Format Counters 
Bytes Written=94
20/11/02 16:09:22 INFO mapreduce.ImportJobBase: Transferred 94 bytes in 16.8683 seconds (5.5726 bytes/sec)
20/11/02 16:09:22 INFO mapreduce.ImportJobBase: Retrieved 5 records.
  1. To view the hive Of address2 surface , Visible data has been imported successfully :
hive> select * from address2;
OK
1 guangdong guangzhou
2 guangdong shenzhen
3 shanxi xian
4 shanxi hanzhong
6 jiangshu nanjing
Time taken: 0.049 seconds, Fetched: 5 row(s)
  • thus ,Sqoop The deployment and basic operation of the tool has been experienced , We hope that when you perform data import and export operations , This article can give you some reference ;

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版权声明
本文为[Programmer Xin Chen]所创,转载请带上原文链接,感谢
https://javamana.com/2021/04/20210416134940138F.html

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