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From Zheng Da <zhengda1...@gmail.com>
Subject Re: Data block placement in HDFS
Date Tue, 03 Jul 2012 22:51:17 GMT
Is v0.21 or v0.22 a stable version? The website doesn't say it explicitly.


On Tue, Jul 3, 2012 at 12:06 PM, Robert Evans <evans@yahoo-inc.com> wrote:

> I think this deals more with our messed up version numbering then
> anything.  Hadoop-1.0 is not a release that is derived from Hadoop 0.21 or
> 0.22, it comes from the 0.20 line.  Hadoop-2.0 is what comes from v0.21 and
> 0.22. So Hadoop-2 is going to have this, but Hadoop-1 will not.
> --Bobby Evans
> From: Zheng Da <zhengda1936@gmail.com>
> Reply-To: "hdfs-user@hadoop.apache.org" <hdfs-user@hadoop.apache.org>
> To: "hdfs-user@hadoop.apache.org" <hdfs-user@hadoop.apache.org>
> Subject: Data block placement in HDFS
> Hello,
> It's interesting to see HDFS provided an interface
> BlockPlacementPolicy for users to define their own data placement policy in
> Hadoop v0.21, v0.22, and I think it's very useful for some applications.
> However, I can't find this interface in the latest stable version of Hadoop
> v1.0. Is the interface replaced by something else or abandoned completely?
> If it's abandoned, could anyone tell me why?
> Thanks,
> Da

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