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Posted to mapreduce-user@hadoop.apache.org by aliyeh saeedi <a1...@yahoo.com> on 2012/01/30 07:36:49 UTC

Files written by reducers

Hi
Does Hadoop behave with reducer's output like other files in the case of replication and keeping their metadata in NameNode?

Re: Files written by reducers

Posted by Harsh J <ha...@cloudera.com>.

Arun just answered this on your other thread, which I quote here:
"The NameNode doesn't care how you wrote the file i.e. either via
'bin/hadoop dfs -put <>' or via a MR job."

So the answer is yes. Writes to HDFS are agnostic about what the
source is - mapper/reducer/hbase/direct.

On Mon, Jan 30, 2012 at 12:06 PM, aliyeh saeedi <a1...@yahoo.com> wrote:
> Hi
> Does Hadoop behave with reducer's output like other files in the case of
> replication and keeping their metadata in NameNode?

-- 
Harsh J
Customer Ops. Engineer, Cloudera