hadoop2 中找不到 println 或者 log 的内容?

hadoop2.6.3 ， intellij ，没有用 maven 。

写最简单的 wordcount ，想用 System.out.println 或者 log.info 输出点东西，但是 master:19888/jobhistory 里面的 log 找不到。

代码很简单的：

import java.io.IOException; import java.util.StringTokenizer; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.Reducer; 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.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class WordCount { public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable>{ private final static IntWritable One= new IntWritable(1); private Text word = new Text(); private static final Log LOG = LogFactory.getLog(TokenizerMapper.class); public void map(Object key, Text value, Context context ) throws IOException, InterruptedException { LOG.info("this is log.info"); LOG.error("this is log.error"); System.out.println("this is system.out.println"); StringTokenizer itr = new StringTokenizer(value.toString()); while (itr.hasMoreTokens()) { word.set(itr.nextToken()); context.write(word, one); } } } public static class IntSumReducer extends Reducer<Text,IntWritable,Text,IntWritable> { private IntWritable result = new IntWritable(); public void reduce(Text key, Iterable<IntWritable> values, Context context ) throws IOException, InterruptedException { int sum = 0; for (IntWritable val : values) { sum += val.get(); } result.set(sum); context.write(key, result); } } public static void main(String[] args) throws Exception { Configuration cOnf= new Configuration(); String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs(); if (otherArgs.length != 2) { System.err.println("Usage: wordcount <in> <out>"); System.exit(2); } Job job = Job.getInstance(conf, "word count"); job.setJarByClass(WordCount.class); job.setMapperClass(TokenizerMapper.class); job.setCombinerClass(IntSumReducer.class); job.setReducerClass(IntSumReducer.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class); FileInputFormat.addInputPath(job, new Path(otherArgs[0])); FileOutputFormat.setOutputPath(job, new Path(otherArgs[1])); System.exit(job.waitForCompletion(true) ? 0 : 1); } } 

log 是这样的：

Log Type: stderr Log Upload Time: 20-05-2016 17:12:41 Log Length: 545 SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/usr/local/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/usr/local/hadoop/tmp/nm-local-dir/usercache/chenxuyuan/appcache/application_1463402812846_0004/filecache/10/job.jar/job.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory] Log Type: stdout Log Upload Time: 20-05-2016 17:12:41 Log Length: 0 Log Type: syslog Log Upload Time: 20-05-2016 17:12:41 Log Length: 3255 2016-05-16 22:21:48,909 INFO [main] org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties 2016-05-16 22:21:49,159 INFO [main] org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s). .......(omit) 

在 stackoverflow 上搜了一圈，有人说 local/standalone 模式下肯定是有输出的，但是即使是 local mode 也啥都找不到..