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From "Akira Ajisaka (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-6682) Add a metric to expose the timestamp of the oldest under-replicated block
Date Mon, 17 Oct 2016 02:41:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Akira Ajisaka resolved HDFS-6682.
---------------------------------
          Resolution: Not A Problem
    Target Version/s:   (was: 2.8.0)

Closing this issue since HDFS-10341 was fixed.

bq. As Andrew suggested, recording the rate of addition/removal from UnderReplicatedBlocks
would be useful and straightforward to me.
If someone needs this, please create a separate jira and link to this issue.

> 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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