Xiao Chen updated HDFS-11009:
    Attachment: HDFS-11090.branch-2.patch

Thanks Andrew!
Backporting to branch-2 has some minor conflict due to FSDatasetImpl change 
from HDFS-10636. Uploading a branch-2 patch.

> Add a tool to reconstruct block meta file from CLI
> --------------------------------------------------
>                 Key: HDFS-11009
>                 URL: https://issues.apache.org/jira/browse/HDFS-11009
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: HDFS-11009.01.patch, HDFS-11009.02.patch, 
> HDFS-11009.03.patch, HDFS-11009.04.patch, HDFS-11090.branch-2.patch
> If the block file on local disk presents, but the meta file is missing, it's 
> theoretically possible to manually restore the meta file and have the block 
> readable.
> This jira is to propose to add such a tool to do that.

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