DF,
You can set mapred.child.java.opts to set java options, but you can also set
mapred.child.env to set environment variables, be careful because they are
space separated with an = in between them.
<property>
<name>mapred.child.env</name>
<value>LD_LIBRARY_PATH=/home/mylibpath1/lib1;home/mylibpath2/lib2;home/mylibpath3/lib3</value>
</property>
--Bobby
On 4/29/11 5:58 AM, "Donatella Firmani" <donatellafirm...@yahoo.com> wrote:
To solve the issue addressed in my previous message, i tried setting property
mapred.child.java.opts in mapred-site.xml. But - even if it seems the right
approach in relation to what said in blogs & forums - there is a big problem
with it.
Following the tutorial (hadoop website) as section Task Execution & Environment,
my xml looks like:
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>localhost:9001</value>
</property>
<property>
<name>mapred.child.java.opts</name>
<value>
-Djava.library.path=/home/mylibpath1/lib1;home/mylibpath2/lib2;home/mylibpath3/lib3
</value>
</property>
</configuration>
The problem arises when executing the job, because it is thrown an exception:
Exception in thread "main" java.lang.NoClassDefFoundError:
-Djava/library/path=/home/mylibpath1/lib1;home/mylibpath2/lib2;home/mylibpath3/lib3
Any help would be appreciated.
Thanks in advance,
DF
----- Original Message ----
From: Donatella Firmani <donatellafirm...@yahoo.com>
To: mapreduce-user@hadoop.apache.org
Sent: Fri, April 29, 2011 12:57:52 PM
Subject: Hadoop Mapreduce jobs and LD_LIBRARY_PATH
Hi to all,
I just subscribed to this mailing list and I'd like to ask you if anyone knows
how to deal with LD_LIBRARY_PATH.
I have a Java application that needs a proper setting of this environment
variable to work under Linux-Ubuntu.
I want to use tis application from a mapreduce job, unfortunately I could not
find a way to make things work against the LD_LIBRARY_PATH environment variable.
I tried so many different strategies and I am stuck. Maybe someone of you can
help.
Thanks in advance,
Cheers.
DF
PS: I use hadoop-0-20-2
