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From Pavan Kulkarni <pavan.babu...@gmail.com>
Subject Re: Checksum Error during Reduce Phase hadoop-1.0.2
Date Thu, 16 Aug 2012 17:04:52 GMT
Harsh,

 I see this on couple of nodes.But what may be the cause of this error ?Any
idea about it? Thanks

On Sun, Aug 12, 2012 at 9:06 AM, Harsh J <harsh@cloudera.com> wrote:

> Hi Pavan,
>
> Do you see this happen on a specific node every time (i.e. when the
> reducer runs there)?
>
> On Fri, Aug 10, 2012 at 11:43 PM, Pavan Kulkarni
> <pavan.baburao@gmail.com> wrote:
> > Hi,
> >
> >  I am running a Terasort with a cluster of 8 nodes.The map phase
> completes
> > but when the reduce phase is around 68-70% I get this following error.
> >
> > *
> > 12/08/10 11:02:36 INFO mapred.JobClient: Task Id :
> > attempt_201208101018_0001_r_000027_0, Status : FAILED
> > java.lang.RuntimeException: problem advancing post rec#38320220
> > *
> > *        at
> > org.apache.hadoop.mapred.Task$ValuesIterator.next(Task.java:1214)*
> > *        at
> >
> org.apache.hadoop.mapred.ReduceTask$ReduceValuesIterator.moveToNext(ReduceTask.java:249)
> > *
> > *        at
> >
> org.apache.hadoop.mapred.ReduceTask$ReduceValuesIterator.next(ReduceTask.java:245)
> > *
> > *        at
> >
> org.apache.hadoop.mapred.lib.IdentityReducer.reduce(IdentityReducer.java:40)
> > *
> > *        at
> > org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:519)*
> > *        at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:420)*
> > *        at org.apache.hadoop.mapred.Child$4.run(Child.java:255)*
> > *        at java.security.AccessController.doPrivileged(Native Method)*
> > *        at javax.security.auth.Subject.doAs(Subject.java:416)*
> > *        at
> >
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093)
> > *
> > *        at org.apache.hadoop.mapred.Child.main(Child.java:249)*
> > *Caused by: org.apache.hadoop.fs.ChecksumException: Checksum Error*
> > *        at
> >
> org.apache.hadoop.mapred.IFileInputStream.doRead(IFileInputStream.java:164)*
> > *        at
> >
> org.apache.hadoop.mapred.IFileInputStream.read(IFileInputStream.java:101)*
> > *        at
> org.apache.hadoop.mapred.IFile$Reader.readData(IFile.java:328)*
> > *        at
> org.apache.hadoop.mapred.IFile$Reader.rejigData(IFile.java:358)*
> > *        at
> > org.apache.hadoop.mapred.IFile$Reader.readNextBlock(IFile.java:342)*
> > *        at org.apache.hadoop.mapred.IFile$Reader.next(IFile.java:374)*
> > *        at
> org.apache.hadoop.mapred.Merger$Segment.next(Merger.java:220)*
> > *        at
> >
> org.apache.hadoop.mapred.Merger$MergeQueue.adjustPriorityQueue(Merger.java:330)
> > *
> > *        at
> org.apache.hadoop.mapred.Merger$MergeQueue.next(Merger.java:350)
> > *
> > *        at
> >
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$RawKVIteratorReader.next(ReduceTask.java:2531)
> > *
> > *        at
> org.apache.hadoop.mapred.Merger$Segment.next(Merger.java:220)*
> > *        at
> >
> org.apache.hadoop.mapred.Merger$MergeQueue.adjustPriorityQueue(Merger.java:330)
> > *
> > *        at
> org.apache.hadoop.mapred.Merger$MergeQueue.next(Merger.java:350)
> > *
> > *        at
> > org.apache.hadoop.mapred.Task$ValuesIterator.readNextKey(Task.java:1253)*
> > *        at
> > org.apache.hadoop.mapred.Task$ValuesIterator.next(Task.java:1212)*
> > *        ... 10 more*
> >
> > I came across somone facing the same
> > issue<
> http://mail-archives.apache.org/mod_mbox/hadoop-common-user/201001.mbox/%3C1c802db51001280427j5b8e57dai4a8d0fdd038f41@mail.gmail.com%3E
> >in
> > the mail-archives and he seemed to resolve it by listing hostnames in
> > the */etc/hosts *file,
> > but all my nodes have correct info about the hostnames in /etc/hosts,
> but I
> > still have these reducers throwing error.
> > Any help regarding this issue is appreciated .Thanks
> >
> > --
> >
> > --With Regards
> > Pavan Kulkarni
>
>
>
> --
> Harsh J
>



-- 

--With Regards
Pavan Kulkarni

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