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https://issues.apache.org/jira/browse/HDFS-7381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14202922#comment-14202922
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Haohui Mai commented on HDFS-7381:
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The v1 patch creates a new class ({{BlockIdManager}} in the {{blockmanagement}} 
package) to manage the block ids and generation stamps. {{FSNamesystem}} is 
still responsible to persist the latest generation stamp and block id in the 
edit logs.

> Decouple the management of block id and gen stamps from FSNamesystem
> --------------------------------------------------------------------
>
>                 Key: HDFS-7381
>                 URL: https://issues.apache.org/jira/browse/HDFS-7381
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Haohui Mai
>            Assignee: Haohui Mai
>         Attachments: HDFS-7381.000.patch
>
>
> The block layer should be responsible of managing block ids and generation 
> stamps. Currently the functionality is misplace into {{FSNamesystem}}.
> This jira proposes to decouple them from the {{FSNamesystem}} class.



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