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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1502) IOException at task startup "No valid local directories in property: dfs.client.buffer.dir"
Date Fri, 22 Jun 2007 06:01:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12507130
] 

Devaraj Das commented on HADOOP-1502:
-------------------------------------

A comment here is that the File class's mkdirs( ) is vulnerable to the problem (as I commented
https://issues.apache.org/jira/browse/HADOOP-1513#action_12507128), but File.mkdir( ) is not.
File class doesn't cache updates (as is true with HDFS). 
File.mkdir( ), File.exists( ) calls are passed on to the OS. So for example, if a thread calls
File.mkdir(), and, if another thread makes a call to File.exists() while the mkdir( ) is in
progress, that exists( ) call will return false. So if a call to File.exists() returns true,
we can be sure that the native filesystem contains that path.

> 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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