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From "Takuya Fukudome (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7619) Erasure Coding: Handling files in snapshots
Date Thu, 02 Apr 2015 02:16:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14391986#comment-14391986
] 

Takuya Fukudome commented on HDFS-7619:
---------------------------------------

Hi [~jingzhao],

If my understanding is correct, I guess the support of EC file have already been added to
snapshot. I think it's better to change this jira to a sub task of HDFS-8031.  And this jira
can only be done after HDFS-7622(Erasure Coding: handling file truncation) has been solved,
right? Thank you.

> Erasure Coding: Handling files in snapshots 
> --------------------------------------------
>
>                 Key: HDFS-7619
>                 URL: https://issues.apache.org/jira/browse/HDFS-7619
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Jing Zhao
>            Assignee: Takuya Fukudome
>
> Currently for files within snapshots, the file diff only records block list (before the
truncate feature we only recorded file length). Now the file diff should also be able to capture
the block groups.
> In the meanwhile, if a file has been truncated in history and the change has been recorded
in snapshots, when we convert the file to EC, the conversion should also cover the data that
were truncated and the corresponding file diff needs to be updated accordingly.



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