Sqoop hangs if an exception is thrown within ExportRecordWriter.getPreparedStatement( )

AsyncSqlRecordWriter.execUpdate( ) calls getPreparedStatement( ).
If getPreparedStatement( ) throws an exception, the "finally block" runs and calls AsyncSqlRecordWriter.close( ).
AsyncSqlRecordWriter.close( ) calls execThread.join( ) - which hangs.

The user sees this...

10/10/14 10:05:05 INFO mapred.JobClient: Running job: job_201010111417_0015
10/10/14 10:05:06 INFO mapred.JobClient: map 0% reduce 0%
10/10/14 10:05:19 INFO mapred.JobClient: map 100% reduce 0%

...and the job never finishes.
The user has to view the log file for the mapper to see that there is a problem.