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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6682) Add a metric to expose the timestamp of the oldest under-replicated block
Date Thu, 07 Aug 2014 02:33:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14088691#comment-14088691
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Akira AJISAKA commented on HDFS-6682:
-------------------------------------

These failed tests are not related to the patch. They were fixed by INFRA-8097 and HADOOP-10866.

> 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
>         Attachments: 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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