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https://issues.apache.org/jira/browse/MAPREDUCE-5912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14018246#comment-14018246
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Chris Douglas commented on MAPREDUCE-5912:
------------------------------------------
As you identified in HADOOP-10663, returning the default filesystem for local
paths is not correct.
> Task.calculateOutputSize does not handle Windows files after MAPREDUCE-5196
> ---------------------------------------------------------------------------
>
> Key: MAPREDUCE-5912
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5912
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Remus Rusanu
> Assignee: Remus Rusanu
> Fix For: 3.0.0
>
> Attachments: MAPREDUCE-5912.1.patch
>
>
> {code}
> @@ -1098,8 +1120,8 @@ private long calculateOutputSize() throws IOException {
> if (isMapTask() && conf.getNumReduceTasks() > 0) {
> try {
> Path mapOutput = mapOutputFile.getOutputFile();
> - FileSystem localFS = FileSystem.getLocal(conf);
> - return localFS.getFileStatus(mapOutput).getLen();
> + FileSystem fs = mapOutput.getFileSystem(conf);
> + return fs.getFileStatus(mapOutput).getLen();
> } catch (IOException e) {
> LOG.warn ("Could not find output size " , e);
> }
> {code}
> causes Windows local output files to be routed through HDFS:
> {code}
> 2014-06-02 00:14:53,891 WARN [main] org.apache.hadoop.mapred.YarnChild:
> Exception running child : java.lang.IllegalArgumentException: Pathname
> /c:/Hadoop/Data/Hadoop/local/usercache/HadoopUser/appcache/application_1401693085139_0001/output/attempt_1401693085139_0001_m_000000_0/file.out
> from
> c:/Hadoop/Data/Hadoop/local/usercache/HadoopUser/appcache/application_1401693085139_0001/output/attempt_1401693085139_0001_m_000000_0/file.out
> is not a valid DFS filename.
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.getPathName(DistributedFileSystem.java:187)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.access$000(DistributedFileSystem.java:101)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$17.doCall(DistributedFileSystem.java:1024)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$17.doCall(DistributedFileSystem.java:1020)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1020)
> at org.apache.hadoop.mapred.Task.calculateOutputSize(Task.java:1124)
> at org.apache.hadoop.mapred.Task.sendLastUpdate(Task.java:1102)
> at org.apache.hadoop.mapred.Task.done(Task.java:1048)
> {code}
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