Not able to export blob datatype from HDFS to MySQL

Inserted a pdf/jpg/jpeg file to blob column and trying to import it to HDFS. and it is fine. while exporting the same to MySql it is giving
java.io.IOException: Could not buffer record Caused by: java.lang.CloneNotSupportedException: com.cloudera.sqoop.lib.BlobRef

Ifi import the file as sequence file to HDFS then also import is fine but when exporting same to MySQL it says that java.lang.RuntimeException: java.io.IOException: WritableName can't load class: pdffile

Please help me on resolving the issue.

Commands which i am using to import and export are

sqoop import --connect jdbc:mysql://localhost/test --table Image --fields-terminated-by '\t' --username root --password naveen@123 -m 1

sqoop export --connect jdbc:mysql://localhost/test --table Image_new --export-dir /user/naveen/Image --fields-terminated-by '\t' --username root --password naveen@123 -m 1

sqoop import --connect jdbc:mysql://localhost/test --table Image --fields-terminated-by '\t' --username root --password naveen@123 -m 1 --as-sequencefile

and for export am using

sqoop export --connect jdbc:mysql://localhost/test --table Image_new --export-dir /user/naveen/Image --fields-terminated-by '\t' --username root --password naveen@123 -m 1