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https://issues.apache.org/jira/browse/HDFS-592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755280#action_12755280
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Kan Zhang commented on HDFS-592:
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> The problem is that getting a new stamp and token is not pipeline recovery. 
> The result is used for recovering a pipeline. 
You can say the same about addBlock(), can't you? 

> Allow client to get a new generation stamp from NameNode
> --------------------------------------------------------
>
>                 Key: HDFS-592
>                 URL: https://issues.apache.org/jira/browse/HDFS-592
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: Append Branch
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: Append Branch
>
>         Attachments: newGS.patch, newGS1.patch
>
>
> This issue aims to  add an API to ClientProtocol that fetches a new 
> generation stamp and an access token from NameNode to support append or 
> pipeline recovery.

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