E-MapReduce:FAQ about Sqoop

What do I do if the time specified by a timestamp field is eight hours earlier than the original time when I import data from ApsaraDB RDS into E-MapReduce (EMR)?

• Description

  1. The test_table table in ApsaraDB RDS contains a timestamp field.

  2. The following command is used to import data from the test_table table to EMR HDFS:

     sqoop import \
     --connect jdbc:mysql://rm-2ze****341.mysql.rds.aliyuncs.com:3306/s***o_sqoop_db \
     --username s***o \
     --password ****** \
     --table test_table \
     --target-dir /user/hadoop/output \
     --delete-target-dir \
     --direct \
     --split-by id \
     --fields-terminated-by '|' \
     -m 1

  3. The import result is queried.

     In the query result, the time specified by the timestamp field is eight hours earlier than the original time.

• Solution: When you import the data, delete the --direct parameter from the import command.

  sqoop import \
  --connect jdbc:mysql://rm-2ze****341.mysql.rds.aliyuncs.com:3306/s***o_sqoop_db \
  --username s***o \
  --password ****** \
  --table test_table \
  --target-dir /user/hadoop/output \
  --delete-target-dir \
  --split-by id \
  --fields-terminated-by '|' \
  -m 1

  The query result is normal.