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https://issues.apache.org/jira/browse/HDFS-29?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018346#comment-13018346
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Uma Maheswara Rao G commented on HDFS-29:
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Looks this scenario applicable for 20version also.
patch available for 20 version?
> In Datanode, update block may fail due to length inconsistency
> --------------------------------------------------------------
>
> Key: HDFS-29
> URL: https://issues.apache.org/jira/browse/HDFS-29
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: 0.21.0
>
> Attachments: h29_20091012.patch, h29_20091012b.patch,
> h29_20091012c.patch
>
>
> When a primary datanode tries to recover a block. It calls
> getBlockMetaDataInfo(..) to obtains information like block length from each
> datanode. Then, it calls updateBlock(..).
> The block length returned in getBlockMetaDataInfo(..) may be obtained from a
> unclosed local block file F. However, in updateBlock(..), it first closes F
> (if F is open) and then gets the length. These two lengths may be different.
> In such case, updateBlock(..) throws an exception.
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