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https://issues.apache.org/jira/browse/HADOOP-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12664358#action_12664358
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Tsz Wo (Nicholas), SZE commented on HADOOP-5027:
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> I thought all the gen-stamp changes are done by NN.
What do you mean "done by NN"?
> It is a bit scary if generation can be changed by clients and datanodes...
Clients cannot change gs. They only can request a update. Then, the selected
primary datanode will request a generation stamp from the namenode.
> 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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