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https://issues.apache.org/jira/browse/HADOOP-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12478973
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Doug Cutting commented on HADOOP-1062:
--------------------------------------
Could this in fact be caused by a machine w/o ECC memory? The Internet Archive
had lots of problems in sort when it had a bad batch of memory.
> Checksum error in InMemoryFileSystem
> ------------------------------------
>
> Key: HADOOP-1062
> URL: https://issues.apache.org/jira/browse/HADOOP-1062
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.12.1
> Reporter: Espen Amble Kolstad
> Priority: Blocker
> Fix For: 0.12.1
>
>
> Getting the following error in the tasktracker log on 2 attempts:
> 2007-03-05 14:59:50,320 WARN mapred.TaskRunner - task_0001_r_000005_0
> Intermediate Merge of the inmemory files threw an exception:
> org.apache.hadoop.fs.ChecksumException: Checksum error: /trank/n
> utch-0.9-dev/filesystem/mapred/local/task_0001_r_000005_0/map_2.out at
> 16776192
> at
> org.apache.hadoop.fs.ChecksumFileSystem$FSInputChecker.verifySum(ChecksumFileSystem.java:250)
> at
> org.apache.hadoop.fs.ChecksumFileSystem$FSInputChecker.readBuffer(ChecksumFileSystem.java:207)
> at
> org.apache.hadoop.fs.ChecksumFileSystem$FSInputChecker.read(ChecksumFileSystem.java:163)
> at
> org.apache.hadoop.fs.FSDataInputStream$PositionCache.read(FSDataInputStream.java:41)
> at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
> at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
> at java.io.DataInputStream.readFully(DataInputStream.java:178)
> at
> org.apache.hadoop.io.DataOutputBuffer$Buffer.write(DataOutputBuffer.java:57)
> at
> org.apache.hadoop.io.DataOutputBuffer.write(DataOutputBuffer.java:91)
> at
> org.apache.hadoop.io.SequenceFile$Reader.readBuffer(SequenceFile.java:1300)
> at
> org.apache.hadoop.io.SequenceFile$Reader.seekToCurrentValue(SequenceFile.java:1363)
> at
> org.apache.hadoop.io.SequenceFile$Reader.nextRawValue(SequenceFile.java:1656)
> at
> org.apache.hadoop.io.SequenceFile$Sorter$SegmentDescriptor.nextRawValue(SequenceFile.java:2579)
> at
> org.apache.hadoop.io.SequenceFile$Sorter$MergeQueue.next(SequenceFile.java:2351)
> at
> org.apache.hadoop.io.SequenceFile$Sorter.writeFile(SequenceFile.java:2226)
> at
> org.apache.hadoop.mapred.ReduceTaskRunner$InMemFSMergeThread.run(ReduceTaskRunner.java:820)
> When I changed fs.inmemory.size.mb to 0 (was 75 - default) the reduce
> completes successfully.
> Could it be related to HADOOP-1027 or HADOOP-1014?
> - Espen
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