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https://issues.apache.org/jira/browse/HADOOP-1502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12506975
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dhruba borthakur commented on HADOOP-1502:
------------------------------------------
The code that shows this problem is in Configuration.getFile()
{noformat}
public File getFile(String dirsProp, String path) {
...
if (dir.exists() || dir.mkdirs()) { .......... (A)
return file; ...........(B)
}
}
{noformat}
The Statement A is intended to create a directory if it does not exists.
However, when executed by multiple threads/processes at the same time,
Statement (A) returns false and Statement (B) does not gets executed.
> 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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