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Date: Tue, 07 May 2013 08:17:07 +0800
From: =?UTF-8?B?5q615rSq5LmJ?= <duanhongyi@doopai.com>
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To: user@hadoop.apache.org
Subject: Re: How to restore HDFS data
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Thank you, I use rsync to backup every day, so I lost a day of data.


于 2013年05月02日 21:19, Harsh J 写道:
> If you've already run -delete (-move is a better choice if you know DN 
> fault is temporary), then the missing blocks are already deleted from 
> the namespace permanently. No way to recover the data since the blocks 
> have also been invalidated by now.
>
> A HDFS Snapshots feature will arrive in near future to cover the 
> backup scenarios that may prove useful in cases such as this.
>
>
> On Thu, May 2, 2013 at 6:23 PM, 段洪义 <duanhongyi@doopai.com 
> <mailto:duanhongyi@doopai.com>> wrote:
>
>     Datanode error, and then I run hadoop fsck /-delete.Lost a lot of
>     data,
>     Later, these datanode recovery, Is there any way to restore the fsck
>     command to delete the data.
>
>
>
>
> -- 
> Harsh J


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    <div class="moz-cite-prefix">Thank you, I use rsync to backup every
      day, so I lost a day of data.<br>
      <br>
      <br>
      于 2013年05月02日 21:19, Harsh J 写道:<br>
    </div>
    <blockquote
cite="mid:CAOcnVr2uDSZHrhDvdfEDAnPgc7Xiz2jUwuqd8va793PuXB0W8g@mail.gmail.com"
      type="cite">
      <div dir="ltr">If you've already run -delete (-move is a better
        choice if you know DN fault is temporary), then the missing
        blocks are already deleted from the namespace permanently. No
        way to recover the data since the blocks have also been
        invalidated by now.
        <div>
          <br>
        </div>
        <div style="">A HDFS Snapshots feature will arrive in near
          future to cover the backup scenarios that may prove useful in
          cases such as this.</div>
      </div>
      <div class="gmail_extra"><br>
        <br>
        <div class="gmail_quote">On Thu, May 2, 2013 at 6:23 PM, 段洪义 <span
            dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:duanhongyi@doopai.com" target="_blank">duanhongyi@doopai.com</a>&gt;</span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">Datanode
            error, and then I run hadoop fsck /-delete.Lost a lot of
            data,<br>
            Later, these datanode recovery, Is there any way to restore
            the fsck<br>
            command to delete the data.<br>
          </blockquote>
        </div>
        <br>
        <br clear="all">
        <div><br>
        </div>
        -- <br>
        Harsh J
      </div>
    </blockquote>
    <br>
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