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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5027) Block report processing should compare gneration stamp
Date Wed, 14 Jan 2009 21:36:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12663895#action_12663895
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-5027:
------------------------------------------------

> Doesn't NN already know what the latest genstamp should be?

When a block is being updated in lease recovery, some replicators might have a gs larger then
the one stored in the NameNode.  If the update fails, the latest gs may not be committed to
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
>
>
> 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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