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MAPREDUCE-7174. Mapreduce example wordmedian should handle generic options. Contributed by Fei Hui.

This commit is contained in:
Weiwei Yang 2019-01-02 21:39:45 +08:00
parent eee29ed706
commit 9e7196749e
1 changed files with 8 additions and 5 deletions
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13
hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/WordMedian.java
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@ -35,6 +35,7 @@ import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.TaskCounter;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
@ -173,13 +174,15 @@ public class WordMedian extends Configured implements Tool {
@Override
public int run(String[] args) throws Exception {
if (args.length != 2) {
Configuration conf = new Configuration();
String[] otherArgs =
new GenericOptionsParser(conf, args).getRemainingArgs();
if (otherArgs.length != 2) {
System.err.println("Usage: wordmedian <in> <out>");
return 0;
}
setConf(new Configuration());
Configuration conf = getConf();
setConf(conf);
Job job = Job.getInstance(conf, "word median");
job.setJarByClass(WordMedian.class);
@ -188,8 +191,8 @@ public class WordMedian extends Configured implements Tool {
job.setReducerClass(WordMedianReducer.class);
job.setOutputKeyClass(IntWritable.class);
job.setOutputValueClass(IntWritable.class);
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
boolean result = job.waitForCompletion(true);
// Wait for JOB 1 -- get middle value to check for Median