[jira] [Created] (HDFS-6682) Add a metric to expose the timestamp of the oldest under-replicated block

["Akira AJISAKA (JIRA)" <ji...@apache.org>]

Akira AJISAKA created HDFS-6682:
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             Summary: 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


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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