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Copyright [2013-2014] eBay Software Foundation Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
package ml.shifu.guagua.mapreduce.example.sum;
import  org.apache.hadoop.conf.Configuration;
import  org.apache.hadoop.fs.FSDataOutputStream;
import  org.apache.hadoop.fs.FileSystem;
import  org.apache.hadoop.fs.Path;
SumOutput is used to write the final model output to file system.
public class SumOutput extends
        BasicMasterInterceptor<GuaguaWritableAdapter<LongWritable>, GuaguaWritableAdapter<LongWritable>> {
    private static final Logger LOG = LoggerFactory.getLogger(SumOutput.class);

Get output file setting and write final sum value to HDFS file.
    public void postApplication(
            final MasterContext<GuaguaWritableAdapter<LongWritable>, GuaguaWritableAdapter<LongWritable>> context) {
        .info("SumOutput starts to write final sum value to file.");
        Path out = new Path(context.getProps().getProperty("guagua.sum.output"));
        .info("Writing results to {}"out.toString());
        PrintWriter pw = null;
        try {
            FSDataOutputStream fos = FileSystem.get(new Configuration()).create(out);
            pw = new PrintWriter(fos);
        } catch (IOException e) {
            .error("Error in writing output."e);
        } finally {
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