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From Phantom <ghostwhoowa...@gmail.com>
Subject Re: HDFS replica management
Date Tue, 17 Jul 2007 18:29:57 GMT
That's awesome.


On 7/17/07, Doug Cutting <cutting@apache.org> wrote:
> Phantom wrote:
> > Here is the scenario I was concerned about. Consider three nodes in the
> > system A, B and C which are placed say in different racks. Let us say
> that
> > the disk on A fries up today. Now the blocks that were stored on A are
> not
> > going to re-replicated (this is my understanding but I could be wrong in
> > this assumption) to some other node or to the new disk with which you
> would
> > bring back A.
> That's incorrect.  When a datanode fails to send a heartbeat to the
> namenode in a timely manner then its data is assumed missing and is
> re-replicated.  And when block corruption is detected, corrupt replicas
> are removed and non-corrupt replicas are re-replicated to maintain the
> desired level of replication.
> Doug

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