The variables in the configuration files are not replaced with values, when the
job is submitted by Job client
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Key: HADOOP-7239
URL: https://issues.apache.org/jira/browse/HADOOP-7239
Project: Hadoop Common
Issue Type: Bug
Components: conf
Affects Versions: 0.21.0, 0.20.2
Environment: Linux + Sun JDK 1.6
Reporter: Venu Gopala Rao
We have a case where we wanted to create the Job names dynamically at run
time.Since JobConf is an extension for the Configuration object, we thought we
can make use of the variable substitution concept in configuration like below
Job job = new Job(conf, "${mapred.user.name}" + "-job" + new
Random().nextInt());
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]));
job.submit();
We set the required run time variables(in this case mapred.user.name) before
calling the job submit. But on the Job tracker side the variables are not
replaced correctly.
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