To answer more precisely: you should read all three. In theory,
mapreduce-specific questions should be directed to mapreduce-user, and
hdfs-specific questions should be directed to hdfs-user. common-user is
technically just for questions about the "common" code in Hadoop, e.g. the
I/O serialization subsystem, things like SequenceFile, etc. In practice,
common-user is sort of a catch-all where you'll find lots of questions about
all aspects of Hadoop though.

- Aaron


On Fri, Jul 17, 2009 at 2:46 AM, Harish Mallipeddi <
[email protected]> wrote:

> David,
>
> mapreduce-user@ and hdfs-user@ are new mailing lists created just recently
> I believe.
>
> core-user@ has been renamed to common-user@ (as a result there's
> significantly more traffic on common-user@).
>
> - Harish
>
>
> On Fri, Jul 17, 2009 at 11:33 AM, David_ca <[email protected]> wrote:
>
>> Hi,
>>
>> I just started following the hadoop discussion.
>> I was wondering what is the mailing list to use.
>> Is it this one: [email protected]
>> or [email protected]?
>>
>>
>> thanks
>> David.
>>
>
>
>
> --
> Harish Mallipeddi
> http://blog.poundbang.in
>

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