Adjust exception output to offer additional information

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/db/DBInputFormat.java

@@ -234,7 +234,7 @@ conf, createConnection(), getDBConf(), conditions, fieldNames,
             tableName);
       }
     } catch (SQLException ex) {
-      throw new IOException(ex.getMessage());
+      throw new IOException(ex);
     }
   }
 

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.java

@@ -100,14 +100,14 @@ public void close(TaskAttemptContext context) throws IOException {
         catch (SQLException ex) {
           LOG.warn(StringUtils.stringifyException(ex));
         }
-        throw new IOException(e.getMessage());
+        throw new IOException(e);
       } finally {
         try {
           statement.close();
           connection.close();
         }
         catch (SQLException ex) {
-          throw new IOException(ex.getMessage());
+          throw new IOException(ex);
         }
       }
     }
@@ -182,7 +182,7 @@ public RecordWriter<K, V> getRecordWriter(TaskAttemptContext context)
                     constructQuery(tableName, fieldNames));
       return new DBRecordWriter(connection, statement);
     } catch (Exception ex) {
-      throw new IOException(ex.getMessage());
+      throw new IOException(ex);
     }
   }
 

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/db/OracleDataDrivenDBInputFormat.java

@@ -87,7 +87,7 @@ protected RecordReader<LongWritable, T> createDBRecordReader(DBInputSplit split,
           conf, createConnection(), dbConf, dbConf.getInputConditions(),
           dbConf.getInputFieldNames(), dbConf.getInputTableName());
     } catch (SQLException ex) {
-      throw new IOException(ex.getMessage());
+      throw new IOException(ex);
     }
   }
 }