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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3971) Map tasks are receiving FileNotFound Exceptions for spill files on a regular basis and are getting killed
Date Wed, 20 Aug 2008 15:30:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624026#action_12624026
] 

Amar Kamat commented on HADOOP-3971:
------------------------------------

Saw something similar
{noformat}
08-08-20 15:00:04,983 INFO org.apache.hadoop.mapred.Merger: Merging 2 sorted segments
2008-08-20 15:00:04,984 INFO org.apache.hadoop.mapred.Merger: Down to the last merge-pass,
with 2 segments left of total size: 2391740 bytes
2008-08-20 15:00:05,025 INFO org.apache.hadoop.mapred.MapTask: Index: (32617022, 2391738,
2391738)
2008-08-20 15:00:21,204 WARN org.apache.hadoop.mapred.TaskRunner: Parent died.  Exiting attempt_20080820144820_0001_m_000264_0
2008-08-20 15:00:22,466 WARN org.apache.hadoop.mapred.TaskTracker: Error running child
java.io.FileNotFoundException: 
   File xxx/taskTracker/jobcache/job_20080820144820_0001/attempt_20080820144820_0001_m_000264_0/output/spill0.out
does not exist.
	at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:420)
	at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:244)
	at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.<init>(ChecksumFileSystem.java:116)
	at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:274)
	at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:357)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.mergeParts(MapTask.java:1101)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:769)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:255)
	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2318)
{noformat}

> Map tasks are receiving FileNotFound Exceptions for spill files on a regular basis and
are getting killed
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3971
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3971
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Jothi Padmanabhan
>             Fix For: 0.19.0
>
>
> The following is the log -- Map tasks are unable to locate the spill files when they
are doing the final merge (mergeParts). 
> java.io.FileNotFoundException: File /xxx/mapred-tt/mapred-local/taskTracker/jobcache/job_200808190959_0001/attempt_200808190959_0001_m_000000_0/output/spill23.out
does not exist.
> 	at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:420)
> 	at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:244)
> 	at org.apache.hadoop.fs.FileSystem.getContentSummary(FileSystem.java:682)
> 	at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.getFileLength(ChecksumFileSystem.java:218)
> 	at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.seek(ChecksumFileSystem.java:259)
> 	at org.apache.hadoop.fs.FSDataInputStream.seek(FSDataInputStream.java:37)
> 	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.mergeParts(MapTask.java:1102)
> 	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:769)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:255)
> 	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2208)

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