George,
This ought to work. Did you restart all your TTs to have it set into effect?
Also, the right way to do this across Hadoop (in 1.0/cdh3/whatever) is
to add into your hadoop-env.sh:
JAVA_LIBRARY_PATH=/path/to/your/libs:$JAVA_LIBRARY_PATH
This way you do not stand to lose Hadoop's native l
Luiz,
Though it is possible to 'hint' this by tweaking the InputSplits
passed from the job, the default schedulers of Hadoop do not make any
such guarantees and hence this isn't possible unless you write your
own complete scheduler, an exercise that wouldn't suit production
deployments unless you
Hello,
I'm interested in writing a library, to be used with Node.js, that can ask
the JobTracker for information about jobs. I see that this is possible
using the Java API, with the JobClient interface [1]. I also saw that on
the wiki, it mentions that clients can poll the JobTracker for informati
Hi,
Is there any way to ensure the execution of a map on all nodes of a
clusterin a way that each node run the map once and only once. That is, I
would use Hadoop to execute a method on all nodes in the cluster. Without
the possibility that the method execute twice in the same node even if
another
Dmitriy
I've tested it on hadoop 1.0.0 and 1.0.1. (I don't know which version
cdh3u3 is based off of)
In hadoop-env.sh if I set
HADOOP_TASKTRACKER_OPTS="-Djava.library.path=/usr/blah" the TaskTracker
sees that option. Then it gets passed along to all M/R child tasks on
that node. Can you
Hm. doesn't seem to work for me (with cdh3u3)
I defined
export HADOOP_TASKTRACKER_OPTS="-Djava.library.path=/usr/"
and it doesn't seem to work (as opposed to when i set is with
property mapred.child.java.opts on the data node).
Still puzzling.
On Tue, Mar 27, 2012 at 7:17 PM, George Datsko
Dmitriy,
You can set for map or reduce tasks.
Please refer this link:
http://hadoop.apache.org/common/docs/r1.0.1/mapred_tutorial.html#Task+Execution+%26+Environment
mapred.map.child.java.opts
-Xmx512M -Djava.library.path=/home/mycompany/lib -verbose:gc
-Xloggc:/tmp/@taskid@.gc
