sqoop export failed after successful map - mysql

Question

1.sqoop export --connect jdbc:mysql://localhost:3306/hduser_db --username hduser
--password hduser --table export --export-dir /user/hive/warehouse/three --
fields-terminated-by ','
17/09/13 14:10:45 INFO mapreduce.Job: map 0% reduce 0%
17/09/13 14:10:50 INFO mapreduce.Job: map 100% reduce 0%
17/09/13 14:10:51 INFO mapreduce.Job: Job job_1505199140014_0033 failed with
state FAILED due to: Task failed task_1505199140014_0033_m_000000
ob failed as tasks failed. failedMaps:1 failedReduces:0
2.17/09/13 14:10:51 INFO mapreduce.Job: Counters: 8
Job Counters
Failed map tasks=1
Launched map tasks=1
Rack-local map tasks=1
Total time spent by all maps in occupied slots (ms)=2947
Total time spent by all reduces in occupied slots (ms)=0
Total time spent by all map tasks (ms)=2947
Total vcore-milliseconds taken by all map tasks=2947
Total megabyte-milliseconds taken by all map tasks=3017728
17/09/13 14:10:51 WARN mapreduce.Counters: Group FileSystemCounters is
deprecate
17/09/13 14:10:51 INFO mapreduce.ExportJobBase: Transferred 0 bytes in
14.8875 s
17/09/13 14:10:51 WARN mapreduce.Counters: Group
org.apache.hadoop.mapred.Task$C
17/09/13 14:10:51 INFO mapreduce.ExportJobBase: Exported 0 records.
17/09/13 14:10:51 ERROR tool.ExportTool: Error during export:
Export job failed!
at org.apache.sqoop.mapreduce.ExportJobBase.runExport(ExportJobBase.java
at org.apache.sqoop.manager.SqlManager.exportTable(SqlManager.java:931)
at org.apache.sqoop.tool.ExportTool.exportTable(ExportTool.java:80)
at org.apache.sqoop.tool.ExportTool.run(ExportTool.java:99)
at org.apache.sqoop.Sqoop.run(Sqoop.java:147)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:183)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:234)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:243)
at org.apache.sqoop.Sqoop.main(Sqoop.java:252)

Answer 1

While running export command-
Below steps have to be taken care.
Datatypes, column names between source(HDFS data) and destination(table on rdbms) should match.
we should specify all column names in the --columns parameter.
Eg:
sqoop export --connect jdbc:mysql://localhost:3306/hduser_db
--username hduser
--password hduser
--table export
--export-dir /user/hive/warehouse/three
--fields-terminated-by ','
--columns "column1,column2,...." ;