Jing Zhao created HDFS-7619:
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             Summary: 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: Jing Zhao


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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