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https://issues.apache.org/jira/browse/MAPREDUCE-5050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14115061#comment-14115061
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Ewan Higgs commented on MAPREDUCE-5050:
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This is a duplicate of MAPREDUCE-5528.
> Cannot find partition.lst in Terasort on Hadoop/Local File System
> -----------------------------------------------------------------
>
> Key: MAPREDUCE-5050
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5050
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: examples
> Affects Versions: 0.20.2
> Environment: Cloudera VM CDH3u4, VMWare, Linux, Java SE 1.6.0_31-b04
> Reporter: Matt Parker
> Priority: Minor
>
> I'm trying to simulate running Hadoop on Lustre by configuring it to use the
> local file system using a single cloudera VM (cdh3u4).
> I can generate the data just fine, but when running the sorting portion of
> the program, I get an error about not being able to find the _partition.lst
> file. It exists in the generated data directory.
> Perusing the Terasort code, I see in the main method that has a Path
> reference to partition.lst, which is created with the parent directory.
> public int run(String[] args) throws Exception {
> LOG.info("starting");
> JobConf job = (JobConf) getConf();
> >> Path inputDir = new Path(args[0]);
> >> inputDir = inputDir.makeQualified(inputDir.getFileSystem(job));
> >> Path partitionFile = new Path(inputDir,
> >> TeraInputFormat.PARTITION_FILENAME);
> URI partitionUri = new URI(partitionFile.toString() +
> "#" + TeraInputFormat.PARTITION_FILENAME);
> TeraInputFormat.setInputPaths(job, new Path(args[0]));
> FileOutputFormat.setOutputPath(job, new Path(args[1]));
> job.setJobName("TeraSort");
> job.setJarByClass(TeraSort.class);
> job.setOutputKeyClass(Text.class);
> job.setOutputValueClass(Text.class);
> job.setInputFormat(TeraInputFormat.class);
> job.setOutputFormat(TeraOutputFormat.class);
> job.setPartitionerClass(TotalOrderPartitioner.class);
> TeraInputFormat.writePartitionFile(job, partitionFile);
> DistributedCache.addCacheFile(partitionUri, job);
> DistributedCache.createSymlink(job);
> job.setInt("dfs.replication", 1);
> TeraOutputFormat.setFinalSync(job, true);
> JobClient.runJob(job);
> LOG.info("done");
> return 0;
> }
> But in the configure method, the Path isn't created with the parent directory
> reference.
> public void configure(JobConf job) {
> try {
> FileSystem fs = FileSystem.getLocal(job);
> >> Path partFile = new Path(TeraInputFormat.PARTITION_FILENAME);
> splitPoints = readPartitions(fs, partFile, job);
> trie = buildTrie(splitPoints, 0, splitPoints.length, new Text(), 2);
> } catch (IOException ie) {
> throw new IllegalArgumentException("can't read paritions file", ie);
> }
> }
> I modified the code as follows, and now sorting portion of the Terasort test
> works using the
> general file system. I think the above code is a bug.
> public void configure(JobConf job) {
> try {
> FileSystem fs = FileSystem.getLocal(job);
> >> Path[] inputPaths = TeraInputFormat.getInputPaths(job);
> >> Path partFile = new Path(inputPaths[0],
> TeraInputFormat.PARTITION_FILENAME);
> splitPoints = readPartitions(fs, partFile, job);
> trie = buildTrie(splitPoints, 0, splitPoints.length, new Text(), 2);
> } catch (IOException ie) {
> throw new IllegalArgumentException("can't read paritions file", ie);
> }
> }
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