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https://issues.apache.org/jira/browse/HADOOP-4769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE resolved HADOOP-4769.
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Resolution: Won't Fix
This seems not a good idea since the validation is too expensive.
> DataNode should validate the data integrity of a block before updating it
> -------------------------------------------------------------------------
>
> Key: HADOOP-4769
> URL: https://issues.apache.org/jira/browse/HADOOP-4769
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 4769_20081203.patch
>
>
> DataNode currently only validate the existence of the block and meta files
> before update. The data integrity of a block should also be validated.
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