Andrew Wang commented on HDFS-6682:

Thanks Akira. I filed HDFS-11024 for adding rate metrics for recovery work.

> Add a metric to expose the timestamp of the oldest under-replicated block
> -------------------------------------------------------------------------
>                 Key: HDFS-6682
>                 URL: https://issues.apache.org/jira/browse/HDFS-6682
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Akira Ajisaka
>            Assignee: Akira Ajisaka
>              Labels: metrics
>         Attachments: HDFS-6682.002.patch, HDFS-6682.003.patch, 
> HDFS-6682.004.patch, HDFS-6682.005.patch, HDFS-6682.006.patch, HDFS-6682.patch
> In the following case, the data in the HDFS is lost and a client needs to put 
> the same file again.
> # A Client puts a file to HDFS
> # A DataNode crashes before replicating a block of the file to other DataNodes
> I propose a metric to expose the timestamp of the oldest 
> under-replicated/corrupt block. That way client can know what file to retain 
> for the re-try.

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