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https://issues.apache.org/jira/browse/HADOOP-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12664030#action_12664030
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dhruba borthakur commented on HADOOP-5027:
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This code looks good to me. There is already a unit test TestFleAppend2 that 
tests "append". Any clues on why this bug is not caught by that unit test?

> Block report processing should compare gneration stamp
> ------------------------------------------------------
>
>                 Key: HADOOP-5027
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5027
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Tsz Wo (Nicholas), SZE
>             Fix For: 0.19.1
>
>         Attachments: 5027_20090114.patch
>
>
> If a reported block has a different generation stamp then the one stored in 
> the NameNode, the reported block will be considered as invalid.  This is 
> incorrect since blocks with larger generation stamp are valid.

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