Also, do you have ECC RAM? On Aug 16, 2012, at 11:34 AM, Arun C Murthy wrote:
> Primarily, it could be caused by a corrupt disk - which is why checking if > it's happening on a specific node(s) can help. > > Arun > > On Aug 16, 2012, at 10:04 AM, Pavan Kulkarni wrote: > >> 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 <ha...@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.babu...@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/%3c1c802db51001280427j5b8e57dai4a8d0fdd038...@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 > > -- > Arun C. Murthy > Hortonworks Inc. > http://hortonworks.com/ > > -- Arun C. Murthy Hortonworks Inc. http://hortonworks.com/
