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https://issues.apache.org/jira/browse/HDFS-7619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14387793#comment-14387793
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Jing Zhao commented on HDFS-7619:
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Sure, thanks for working on this, [~tfukudom]!
> 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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