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https://issues.apache.org/jira/browse/MAPREDUCE-4770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13562387#comment-13562387
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Arun A K commented on MAPREDUCE-4770:
-------------------------------------
Not sure if this could be the solution -
IsolationRunner is a utility to help debug MapReduce programs.
To use the IsolationRunner, first set keep.failed.task.files to true (also see
keep.task.files.pattern).
Next, go to the node on which the failed task ran and go to the TaskTracker's
local directory and run the IsolationRunner:
$ cd <local path>/taskTracker/${taskid}/work
$ bin/hadoop org.apache.hadoop.mapred.IsolationRunner ../job.xml
IsolationRunner will run the failed task in a single jvm, which can be in the
debugger, over precisely the same input.
Note that currently IsolationRunner will only re-run map tasks.
Reference : http://hadoop.apache.org/docs/r1.1.1/mapred_tutorial.html
> Hadoop jobs failing with FileNotFound Exception while the job is still running
> ------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4770
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4770
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Affects Versions: 0.20.203.0
> Reporter: Jaikannan Ramamoorthy
>
> 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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