as a single Java process and utilizes only 1 cpu core even if there
are many more ?
On Tue, Aug 12, 2014 at 4:32 PM, Sergey Murylev
sergeymury...@gmail.com mailto:sergeymury...@gmail.com wrote:
Yes :)
Pseudo-distributed mode is such configuration when we have some Hadoop
environment
Yes :)
Pseudo-distributed mode is such configuration when we have some Hadoop
environment on single computer.
On 12/08/14 18:25, sindhu hosamane wrote:
Can Setting up 2 datanodes on same machine be considered as
pseudo-distributed mode hadoop ?
Thanks,
Sindhu
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Why do you think that default implementation of COUNT DISTINCT is slow? As
far as I understand the most famous way to find number of distinct elements
is to sort them and scan all sorted items consequently excluding duplicated
elements. Assimptotics of this algoritm is O(n *log n ), I think that
Hi Jeremy,
According to official documentation
http://hadoop.apache.org/docs/r2.2.0/api/org/apache/hadoop/mapreduce/Mapper.html
setup and cleanup calls performed for each InputSplit. In this case you
variant 2 is more correct. But actually single mapper can be used for
processing multiple
Hi Raj,
Should 'john1' be included in the 'sudoers' file ?
Hadoop don't use root privileges. But it has some built-in users and
groups like hdfs, mapred, etc. I think you should add your admin user at
least to groups hdfs and mapred.
--
Thanks,
Sergey
On 28/04/14 23:40, Raj Hadoop wrote:
Hi,
Hi Kuchekar,
I do have the mentioned jar (avro-mapred-1.5.3.jar) in the mentioned
location. Not sure, what I am missing.
Make sure that you can read this file as same user as you use to run sqoop.
According to logs you run sqoop as root. I not sure that root has such
privileges. You can try to
Hi,
1 - I don't understand why this is happening. I should have been able
to copy data. Why I can't copy data between hdfs?
I think you should check permissions not only for root (/), you need
to make sure that whole path is accessible for root. You can do this
using following command:
Hi Ekta,
You can look to following instructions:
single node cluster
http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/
multi node cluster
http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-multi-node-cluster/
Actually I recommend to use
Hi Edward,
You can't achieve data consistency on your cluster configuration. To do
this you need at least 3 data nodes and enabled replication with level 3
( dfs.replication property in hdfs-site.xml).
On 19/02/14 13:02, EdwardKing wrote:
Hadoop 2.2.0, two computer, one is master,another is
