Problem Description
Execute statementbin/sqoop import --connect jdbc:mysql://localhost:3306/gdcmxy --username root --password root --table 2019bigdata --fields-terminated-by '\t' --delete-target-dir --num-mappers 1 --hive-import --hive-database gdcmxy --hive-table 2019bigdata

Error: java.lang.RuntimeException: java.lang.RuntimeException: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

After seeing the error report, it was preliminarily judged that the main problem was the database connection problem. At first, I thought the firewall was not turned off, but considering that hadoo had certainly turned off the firewall before, it should have nothing to do with the firewall.

Cluster environment:

Solution:

Change the localhost of the execution statement to the IP address of the local machine bin/sqoop import -- connect JDBC: mysql://192.168.112.81:3306/gdcmxy --Username root -- password root -- table 2019bigdata -- fields terminated by '\ t' -- delete target dir -- num mappers 1 -- hive import -- hive database gdcmxy -- hive table 2019bigdata

successfully imported