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From Chris Nauroth <cnaur...@hortonworks.com>
Subject Re: Hadoop jobs failing with FileNotFound Exception while the job is still running
Date Sun, 09 Dec 2012 06:17:27 GMT
Hi Rakesh,

It's a bit hard to spot it, but I see "permission denied" in the stack
trace.  Perhaps reviewing local file system permissions for Hadoop's
working directories would reveal something.  It might not be the case that
something is deleting the file.

Hope this helps,
 On Dec 8, 2012 9:57 PM, "rakesh kothari" <rakeshkothari@live.com> wrote:

>  Hi,
> We are having a strange issue in our Hadoop cluster. We have noticed that
> some of our jobs fail with the with a file not found exception[see below].
> Basically the files in the "attempt_*" directory and the directory itself
> are getting deleted while the task is still being run on the host. Looking
> through some of the hadoop documentation I see that the job directory gets
> wiped out when it gets a KillJobAction however I am not sure why it gets
> wiped out while the job is still running.
> My question is what could be deleting it while the job is running? Any
> thoughts or pointers on how to debug this would be helpful.
> Thanks!
> java.io.FileNotFoundException:
> /hadoop/mapred/local_data/taskTracker//jobcache/job_201211030344_15383/attempt_201211030344_15383_m_000169_0/output/spill29.out
> (Permission denied) at java.io.FileInputStream.open(Native Method) at
> java.io.FileInputStream.(FileInputStream.java:120) at
> org.apache.hadoop.fs.RawLocalFileSystem$TrackingFileInputStream.(RawLocalFileSystem.java:71)
> at
> org.apache.hadoop.fs.RawLocalFileSystem$LocalFSFileInputStream.(RawLocalFileSystem.java:107)
> at
> org.apache.hadoop.fs.RawLocalFileSystem.open(RawLocalFileSystem.java:177)
> at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:400) at
> org.apache.hadoop.mapred.Merger$Segment.init(Merger.java:205) at
> org.apache.hadoop.mapred.Merger$Segment.access$100(Merger.java:165) at
> org.apache.hadoop.mapred.Merger$MergeQueue.merge(Merger.java:418) at
> org.apache.hadoop.mapred.Merger$MergeQueue.merge(Merger.java:381) at
> org.apache.hadoop.mapred.Merger.merge(Merger.java:77) at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.mergeParts(MapTask.java:1692)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1322)
> at
> org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:698)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:765) at
> org.apache.hadoop.mapred.MapTask.run(MapTask.java:369) at
> org.apache.hadoop.mapred.Child$4.run(Child.java:259) at
> java.security.AccessController.doPrivileged(Native Method) at
> javax.security.auth.Subject.doAs(Subject.java:396) at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
> at org.apache.hadoop.mapred.Child.main(Child.java:253)

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