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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HADOOP-5027) Block report processing should compare gneration stamp
Date Fri, 16 Jan 2009 01:30:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12664351#action_12664351
] 

shv edited comment on HADOOP-5027 at 1/15/09 5:29 PM:
----------------------------------------------------------------------

May be the problem is not with the block report, but rather with {{nextGenerationStamp(Block)}},
which does not update generation stamp for the block. The -client- _data-node_ should call
name-node to obtain a new generation stamp any way, I believe this what Raghu meant? So why
do we not changing the gen stamp of the block.
I also would like to see a unit test catching this bug.

      was (Author: shv):
    May be the problem is not with the block report, but rather with {{nextGenerationStamp(Block)}},
which does not update generation stamp for the block. The client should call name-node to
obtain a new generation stamp any way, I believe this what Raghu meant? So why do we not changing
the gen stamp of the block.
I also would like to see a unit test catching this bug.
  
> 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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