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https://issues.apache.org/jira/browse/HADOOP-1502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12507547
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Michael Bieniosek commented on HADOOP-1502:
-------------------------------------------

So, in my case, the problem was that the user of the fs client didn't have 
write permission to dfs.client.buffer.dir.  In this case, we should probably 
make the error message more clear.

> IOException at task startup "No valid local directories in property: 
> dfs.client.buffer.dir"
> -------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1502
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1502
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.12.3
>            Reporter: Koji Noguchi
>            Priority: Minor
>
> When tasks started up on a brand new mapred cluster, I saw couples of them 
> fail immediately  by 
> java.io.IOException: No valid local directories in property: 
> dfs.client.buffer.dir
>       at org.apache.hadoop.conf.Configuration.getFile(Configuration.java:401)
>       at 
> org.apache.hadoop.dfs.DFSClient$DFSOutputStream.newBackupFile(DFSClient.java:1037)
>       at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.(DFSClient.java:1004)
>       at org.apache.hadoop.dfs.DFSClient.create(DFSClient.java:276)
>       at 
> org.apache.hadoop.dfs.DistributedFileSystem$RawDistributedFileSystem.create(DistributedFileSystem.java:143)
>       at 
> org.apache.hadoop.fs.ChecksumFileSystem$FSOutputSummer.(ChecksumFileSystem.java:367)
>       at 
> org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:442)
>       at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:346)
>       at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:253)
>       at 
> org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.copy(CopyFiles.java:215)
>       at 
> org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.map(CopyFiles.java:410)
>       at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:48)
>       at org.apache.hadoop.mapred.MapTask.run(MapTask.java:175)
>       at 
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1445)
> (Run on version 0.12.3 + many patches, so the line number could be a little 
> off)

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