Use hive custom outputformat to handle log files - hadoop

Question

I want to use hive Version 0.7.0 handle the log files and i set the custem inputformat and outputformat. In the inputformat, i replace the "\n" to "###", and in the outputformat i want to change back to "\n". After test my inputformat does well but my outputformat doesn't work. I want to know why. Here is the code. Thanks!
public class ErrlogOutputFormat, V extends Writable>
extends HiveIgnoreKeyTextOutputFormat {
public static class CustomRecordWriter implements RecordWriter{
RecordWriter writer;
BytesWritable bytesWritable;
public CustomRecordWriter(RecordWriter writer) {
this.writer = writer;
bytesWritable = new BytesWritable();
}
#Override
public void write(Writable w) throws IOException {
//String str = ((Text) w).toString().replaceAll("###","\n");
String[] str = ((Text) w).toString().split("###");
StringBuffer sb = new StringBuffer();
for(String s:str){
sb.append(s).append("\n");
}
Text txtReplace = new Text(sb.toString());
System.out.println("------------------------");
System.out.println(txtReplace.toString());
System.out.println("------------------------");
// Get input data
// Encode
byte[] output = txtReplace.getBytes();
bytesWritable.set(output, 0, output.length);
writer.write(bytesWritable);
}
#Override
public void close(boolean abort) throws IOException {
writer.close(abort);
}
}
#Override
public RecordWriter getHiveRecordWriter(JobConf jc, Path finalOutPath,
Class valueClass, boolean isCompressed,
Properties tableProperties, Progressable progress)
throws IOException {
CustomRecordWriter writer = new CustomRecordWriter(super
.getHiveRecordWriter(jc, finalOutPath, BytesWritable.class,
isCompressed, tableProperties, progress));
return writer;
}
}