Description
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
Attachments
Attachments
Issue Links
- relates to
-
HDFS-72 IOException at task startup "No valid local directories in property: dfs.client.buffer.dir"
- Resolved