Hello,

in april we have upgraded our version of Hadoop 0.21.0 to version 1.0.1.
We stuck to the exact instructions in the upgrade documentation as
always. After a few months we have discovered on the Namenode that here
again "upgrade for version -32 has been completed. Upgrade is not
finalized." is displayed. Our question now is, can we run this command
without risk again? According to our research, this command deletes the
directory on the Data Nodes "previous" and the directories on the
namenode "previous" and "previous.checkpoint". It is very important that
we here do not lose data. A backup is not possible for reasons of cost.
Is there eventually an easy way to test it?

Ulrich

Ulrich,

It is fine to run the "hadoop dfsadmin -finalizeUpgrade" command to
complete the upgrade but since it has been a while that you haven't
done that, I expect it may take quite a while to finish as there'll
now be lots of blocks to process for upgrades. However, there should
be no risk in running that command.

On Tue, Oct 2, 2012 at 7:17 PM, Ulrich Kammer <[EMAIL PROTECTED]> wrote:
> Hello,
>
> in april we have upgraded our version of Hadoop 0.21.0 to version 1.0.1. We
> stuck to the exact instructions in the upgrade documentation as always.
> After a few months we have discovered on the Namenode that here again
> "upgrade for version -32 has been completed. Upgrade is not finalized." is
> displayed. Our question now is, can we run this command without risk again?
> According to our research, this command deletes the directory on the Data
> Nodes "previous" and the directories on the namenode "previous" and
> "previous.checkpoint". It is very important that we here do not lose data. A
> backup is not possible for reasons of cost. Is there eventually an easy way
> to test it?
>
> Ulrich

--
Harsh J