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POUnable to run MR on cluster
 

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  1. POUnable to run MR on cluster
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    <p>I have an Map reduce program that is running successfully in standalone(Ecllipse) mode but while trying to run the same MR by exporting the jar in cluster. It is showing null pointer exception like this,</p> <pre><code> 13/06/26 05:46:22 ERROR mypackage.HHDriver: Error while configuring run method. java.lang.NullPointerException </code></pre> <p>I used the following code for run method.</p> <pre><code>public static void main(String[] args) throws IOException, InterruptedException, ClassNotFoundException { Configuration configuration = new Configuration(); Tool headOfHouseHold = new HHDriver(); try { ToolRunner.run(configuration,headOfHouseHold,args); } catch (Exception exception) { exception.printStackTrace(); LOGGER.error("Error while configuring run method", exception); // System.exit(1); } } </code></pre> <p>run method:</p> <pre><code>if (args != null &amp;&amp; args.length == 8) { // Setting the Configurations GenericOptionsParser genericOptionsParser=new GenericOptionsParser(args); Configuration configuration=genericOptionsParser.getConfiguration(); //Configuration configuration = new Configuration(); configuration.set("fs.default.name", args[0]); configuration.set("mapred.job.tracker", args[1]); configuration.set("deltaFlag",args[2]); configuration.set("keyPrefix",args[3]); configuration.set("outfileName",args[4]); configuration.set("Inpath",args[5]); String outputPath=args[6]; configuration.set("mapred.map.tasks.speculative.execution", "false"); configuration.set("mapred.reduce.tasks.speculative.execution", "false"); // To avoid the creation of _LOG and _SUCCESS files configuration.set("mapreduce.fileoutputcommitter.marksuccessfuljobs", "false"); configuration.set("hadoop.job.history.user.location", "none"); configuration.set(Constants.MAX_NUM_REDUCERS,args[7]); // Configuration of the MR-Job Job job = new Job(configuration, "HH Job"); job.setJarByClass(HHDriver.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(Text.class); job.setNumReduceTasks(HouseHoldingHelper.numReducer(configuration)); job.setInputFormatClass(TextInputFormat.class); job.setOutputFormatClass(TextOutputFormat.class); MultipleOutputs.addNamedOutput(job,configuration.get("outfileName"), TextOutputFormat.class,Text.class,Text.class); // Deletion of OutputTemp folder (if exists) FileSystem fileSystem = FileSystem.get(configuration); Path path = new Path(outputPath); if (path != null /*&amp;&amp; path.depth() &gt;= 5*/) { fileSystem.delete(path, true); } // Deletion of empty files in the output (if exists) FileStatus[] fileStatus = fileSystem.listStatus(new Path(outputPath)); for (FileStatus file : fileStatus) { if (file.getLen() == 0) { fileSystem.delete(file.getPath(), true); } } // Setting the Input/Output paths FileInputFormat.setInputPaths(job, new Path(configuration.get("Inpath"))); FileOutputFormat.setOutputPath(job, new Path(outputPath)); job.setMapperClass(HHMapper.class); job.setReducerClass(HHReducer.class); job.waitForCompletion(true); return job.waitForCompletion(true) ? 0 : 1; </code></pre> <p>I double checked the run method parameters those are not null and it is running in standalone mode as well..</p>
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    1. USShekhar
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      1. POUnable to run MR on cluster
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    2. VO
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      1. POUnable to run MR on cluster
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    1. COare you creating the hadoop configuration properly? More importantly is your MR job dependent on external jars?
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      1. USJit B
    2. CO@JitB Yes. I checked it
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