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https://issues.apache.org/jira/browse/HADOOP-3033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12579714#action_12579714
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Raghu Angadi commented on HADOOP-3033:
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Earlier in the same log file for another block :
{noformat}
2008-03-17 20:03:06,945 INFO org.apache.hadoop.dfs.DataNode: Changing block
file offset of block blk_-8611433653592759099 from 84869120 to 84934656 meta
file offset to 663559
2008-03-17 20:03:08,128 INFO org.apache.hadoop.dfs.DataNode: Changing block
file offset of block blk_-8611433653592759099 from 114294784 to114360320 meta
file offset to 893447
2008-03-17 20:03:09,057 INFO org.apache.hadoop.dfs.DataNode: Received block
blk_-8611433653592759099 of size 134217728 from /a.b.c.79
{noformat}
This is strange too. The BlockReceiver thread calls {{out.write()}} then the
above 'Changing ...' message is logged. But the check inside
setChannelPosition() and it did not result in an exception. So something
changed the channels position in the mean time (during this, there were no
writes to 'out').
> Datanode fails write to DFS file with exception message "Trying to change
> block file offset"
> --------------------------------------------------------------------------------------------
>
> Key: HADOOP-3033
> URL: https://issues.apache.org/jira/browse/HADOOP-3033
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.16.1
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: badnode.patch
>
>
> A write to a DFS block failed with the lastdatanode in the pipeline reporting
> this error:
> Receiving block blk_-7279084187433655573 src: /xx.xx.xx.xx:xx dest:
> /xx.xx.xx.xx:50010
> Changing block file offset of block blk_-7279084187433655573 from 9043968 to
> 9043968 meta file offset to 70663
> Changing block file offset of block blk_-7279084187433655573 from 111935488
> to 112001024 meta file offset to 875015
> Exception in receiveBlock for block blk_-7279084187433655573
> java.io.IOException: Trying to change block file offset of block
> blk_-7279084187433655573 to 112001024 but actual size of file is 111935488
> PacketResponder 0 for block blk_-7279084187433655573 Interrupted.
> PacketResponder 0 for block blk_-7279084187433655573 terminating
> writeBlock blk_-7279084187433655573 received exception java.io.IOException:
> Trying to change block file offset of block blk_-7279084187433655573 to
> 112001024 but actual size of file is 111935488
> DataXceiver: java.io.IOException: Trying to change block file offset of block
> blk_-7279084187433655573 to 112001024 but actual size of file is 111935488
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