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Posted to common-dev@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2007/06/21 13:36:26 UTC
[jira] Commented: (HADOOP-1513) A likely race condition between the
creation of a directory and checking for its existence in the DiskChecker
class
[ https://issues.apache.org/jira/browse/HADOOP-1513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12506855 ]
Hadoop QA commented on HADOOP-1513:
-----------------------------------
+1
http://issues.apache.org/jira/secure/attachment/12360263/1513.patch applied and successfully tested against trunk revision r549284.
Test results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/316/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/316/console
> A likely race condition between the creation of a directory and checking for its existence in the DiskChecker class
> -------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-1513
> URL: https://issues.apache.org/jira/browse/HADOOP-1513
> Project: Hadoop
> Issue Type: Bug
> Components: fs
> Affects Versions: 0.14.0
> Reporter: Devaraj Das
> Assignee: Devaraj Das
> Priority: Critical
> Fix For: 0.14.0
>
> Attachments: 1513.patch
>
>
> Got this exception in a job run. It looks like the problem is a race condition between the creation of a directory and checking for its existence. Specifically, the line:
> if (!dir.exists() && !dir.mkdirs()), doesn't seem safe when invoked by multiple processes at the same time.
> 2007-06-21 07:55:33,583 INFO org.apache.hadoop.mapred.MapTask: numReduceTasks: 1
> 2007-06-21 07:55:33,818 WARN org.apache.hadoop.fs.AllocatorPerContext: org.apache.hadoop.util.DiskChecker$DiskErrorException: can not create directory: /export/crawlspace/kryptonite/ddas/dfs/data/tmp
> at org.apache.hadoop.util.DiskChecker.checkDir(DiskChecker.java:26)
> at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.createPath(LocalDirAllocator.java:211)
> at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathForWrite(LocalDirAllocator.java:248)
> at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.createTmpFileForWrite(LocalDirAllocator.java:276)
> at org.apache.hadoop.fs.LocalDirAllocator.createTmpFileForWrite(LocalDirAllocator.java:155)
> at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.newBackupFile(DFSClient.java:1171)
> at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.(DFSClient.java:1136)
> at org.apache.hadoop.dfs.DFSClient.create(DFSClient.java:342)
> at org.apache.hadoop.dfs.DistributedFileSystem$RawDistributedFileSystem.create(DistributedFileSystem.java:145)
> at org.apache.hadoop.fs.ChecksumFileSystem$FSOutputSummer.(ChecksumFileSystem.java:368)
> at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:443)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:254)
> at org.apache.hadoop.io.SequenceFile$Writer.(SequenceFile.java:675)
> at org.apache.hadoop.io.SequenceFile.createWriter(SequenceFile.java:165)
> at org.apache.hadoop.examples.RandomWriter$Map.map(RandomWriter.java:137)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:46)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:189)
> at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1740)
> 2007-06-21 07:55:33,821 WARN org.apache.hadoop.mapred.TaskTracker: Error running child
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