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From Harsh J <ha...@cloudera.com>
Subject Re: hadoop 2.4 using Protobuf - How does downgrade back to 2.3 works ?
Date Sat, 18 Oct 2014 20:46:10 GMT
Until you issue a finalize command, the pre-upgrade metadata is kept
aside for rolling back. When you issue the rollback command, it
replaces the past metadata files back.

On Fri, Oct 17, 2014 at 5:45 AM, Manoj Samel <manojsameltech@gmail.com> wrote:
> Hadoop 2.4.0 mentions that FSImage is stored using protobuf. So upgrade from
> 2.3.0 to 2.4 would work since 2.4 can read old (2.3) binary format and write
> the new 2.4 protobuf format.
>
> After using 2.4, if there is a need to downgrade back to 2.3, how would that
> work ?
>
> Thanks,



-- 
Harsh J

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