When I try to start dfs using start-dfs.sh I get this error message:
14/07/03 11:03:21 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
Starting namenodes on [OpenJDK 64-Bit Server VM warning: You have loaded
library
It looks like the native library is not compatible with your
environment. You should delete '/usr/local/hadoop/lib/native' directory
or compile source code to get your own native library.
Thanks,
Akira
(2014/07/03 15:05), Ritesh Kumar Singh wrote:
When I try to start dfs using start-dfs.sh I
First i would like to declare that although i am not new to hadoop, but not
expert on it as well.i would like to consult one issue on mapreduce framework.
below is the description of the scenarios.
When one reduce task is failed on one datanode, then the job tracker will try
to schedule another
@Akira : if i delete my native library, how exactly do i generate my own
copy of it?
@Chris : This is the content of my /etc/hosts file :
127.0.0.1 localhost
127.0.1.1 hduser
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0
You can download the source code and generate your own native library by
$ mvn package -Pdist,native -Dtar -DskipTests
You should see the library in 'hadoop-dist/target/hadoop-2.4.0/lib/native'
Thanks,
Akira
(2014/07/03 15:32), Ritesh Kumar Singh wrote:
@Akira : if i delete my native
The stackoverflow question doesn't add any useful information.
Like I said you can emit the string inside a record. Or if you really want
to handle lots of complexity, write it yourself within a file or a
datastore from the reducer. But you will then have to consider performance
issues and be
It will start from scratch to copy all map outputs from all mapper nodes;
Regards,
*Stanley Shi,*
On Thu, Jul 3, 2014 at 2:28 PM, James Teng tenglinx...@outlook.com wrote:
First i would like to declare that although i am not new to hadoop, but
not expert on it as well.
i would like to
Hi, thanks for your quick reply.could you pls explain bit more in details? like
how to get the info which map nodes have to transfer data to this new reducer
node. and how to communicate with them to transfer the data here.or via what
kind of way to copy data.
James.
Date: Thu, 3 Jul 2014
You can run
$ sudo -u hdfs hdfs dfsadmin -report | grep Hostname -A 1
2014-07-02 7:33 GMT+02:00 hadoop hive hadooph...@gmail.com:
Try running fsck, it will also validate the block placement as well as
replication.
On Jun 27, 2014 6:49 AM, Kilaru, Sambaiah sambaiah_kil...@intuit.com
wrote:
Adding to what Jungi Jeong said, if you can get your hands on the book*
Hadoop: The Definitive Guide *by Tom White, then that would help as well as
it is explains this in significant detail.
Regards,
Shahab
On Thu, Jul 3, 2014 at 6:29 AM, Jungi Jeong jgje...@calab.kaist.ac.kr
wrote:
As far as
hey everyone,
MapR is offering the possibility to acces from one cluster (e.g. a compute
only cluster without much storage capabilities) another cluster's
HDFS/MapRFS (see http://doc.mapr.com/display/MapR/mapr-clusters.conf). In
times of Hadoop-as-a-Service this becomes very interesting. Is this
Nothing is stopping you to implement cluster the way you want.
You can have storage only nodes for your HDFS and do not run tasktrackers
on them.
Start bunch of machines with High RAM and high CPUs but no storage.
Only thing to worry then would be network bandwidth to carry data from hdfs
to
Hello Dear all,
I would like to evaluate the price of a Hadoop cluster using the below
characteristics for my Namenode and for my Datanode.
My cluster should have one Namenode and three datanode.
Could someone help me with the price of commodity hardware with these
characteristics, please ?
Are you using Hadoop 2.x?
What about your secondary namenode?
El jul 3, 2014 11:19 AM, YIMEN YIMGA Gael gael.yimen-yi...@sgcib.com
escribió:
Hello Dear all,
I would like to evaluate the price of a Hadoop cluster using the below
characteristics for my Namenode and for my Datanode.
My
Hey Nitin,
I'm not talking about concept-wise. I'm takling about how to actually do it
technically and how to set it up. Imagine this: I have two clusters, both
running fine and they are both (setup-wise) the same, besides that one has
way more tasktrackers/Nodemanagers than the other one. Now I
Hi,
Actually, i didn’t plan for a secondary namenode. But if I should do so, I will
consider for secondary namenode the same characteristic as the primary namenode.
No, I’m not using Hadoop 2.x. I’m using Hadoop 1.2.1 (Distribution with
JobTracker not resource manager)
Regards
From:
Fabian,
I see this as the classic case of federation of hadoop clusters. The MR
or job can refer to the specific hdfs://file location as input but at the
same time run on another cluster.
You can refer to following link for further details on federation.
Hi,
Using HDP 2.0.6, Yarn 2.1
I am trying to access the REST api per the documentation here:
http://hadoop.apache.org/docs/r2.3.0/hadoop-yarn/hadoop-yarn-site/MapredAppMasterRest.html
When I try to access this
http://rm host:8088/ws/v1/cluster/app/application_1401899005478_2241
I get
This is actually the link I was following:
http://hadoop.apache.org/docs/r2.3.0/hadoop-yarn/hadoop-yarn-site/WebServicesIntro.html
On Thu, Jul 3, 2014 at 4:12 PM, Alex Nastetsky anastet...@spryinc.com
wrote:
Hi,
Using HDP 2.0.6, Yarn 2.1
I am trying to access the REST api per the
Just an update on this: turns out that in 2.2.0 version, the container
count is implemented by using the memory
resource, even though there are configs for vcores. Things might have
changed since
then.
Thanks for the suggestions. yarn.xml was a typo, should have been
yarn-site.xml.
About the
ok, got it. thanks shahab jingi for your helpful reply. :)
Date: Thu, 3 Jul 2014 07:40:20 -0400
Subject: Re: How to recover reducer task data on a different data node?
From: shahab.yu...@gmail.com
To: user@hadoop.apache.org
Adding to what Jungi Jeong said, if you can get your hands on the book
Hi,
Can anyone please explain the significance of the pid files in Hadoop i.e.
purpose and usage etc?
Thanks Regards
Vijay
Hi,
We have our hadoop cluster running with hadoop 1.2.1 and hbase 0.94.14.
Now we are planing to move it to hadoop 2.4.0,hbase 0.98.2.
if we migrate to the above newer versions, will there be any data loss?
Do we need to take any cluster data backup before migrating to newer
version of hadoop
Hi,
If have two map tasks running on one node , i have written combiner class also.
Will combiner be called once for each map task or just once for both the map
tasks
Can i write a logic inside map which will work as combiner ? if yes will there
be any side effect?
Regards,
Chhaya Vishwakarma
Vikas,
Its main use is to keep one process at a time...like one one datanode at a
any host - Can you please elaborate in a more detail?
What is meant by one process at a time? At what level does a pid file come
into picture i.e. is it at a deamon level, job level, task level etc?
Thanks
Vijay
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