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Hadoop, mail # user - why not hadoop backup name node data to local disk daily or hourly?


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周梦想 2012-12-20, 09:48
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Mohammad Tariq 2012-12-20, 10:08
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Mohammad Tariq 2012-12-20, 10:24
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Re: why not hadoop backup name node data to local disk daily or hourly?
Harsh J 2012-12-20, 10:34
Hi Mohammad,

On Thu, Dec 20, 2012 at 3:54 PM, Mohammad Tariq <[EMAIL PROTECTED]> wrote:
> I am sorry Andy, I forgot one important point.
>
>  The Secondary NameNode has been deprecated now, so consider using the
> Checkpoint Node or Backup Node. Checkpoint Node is the process which is
> actually responsible for creating periodic check points. It downloads
> fsimage and log edits from the active NameNode, merges them locally, and
> uploads the new image back to the active NameNode.

This isn't true anymore. We are continuing to keep the SNN and have
undeprecated it. See https://issues.apache.org/jira/browse/HDFS-2397.
We are perhaps deprecating the CheckpointNode though:
https://issues.apache.org/jira/browse/HDFS-4114.

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Harsh J
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Mohammad Tariq 2012-12-20, 10:43
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Harsh J 2012-12-20, 10:06
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Nitin Pawar 2012-12-24, 10:51
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周梦想 2012-12-24, 10:54