I'm not crazy about this semantics (later jar classes overwrite
earlier jar classes) because it is the opposite of the Java class
loader ordering. If other's want this order, however, it should be
clearly documented in all the right places (javadoc, script help msg,
etc).
On Jul 20, 2007, at 10:55 AM, Dennis Kubes (JIRA) wrote:
[ https://issues.apache.org/jira/browse/HADOOP-1622?
page=com.atlassian.jira.plugin.system.issuetabpanels:comment-
tabpanel#action_12514266 ]
Dennis Kubes commented on HADOOP-1622:
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For Nutch development at least (I don't know about others), it is
more useful if classes in later jars overwrite classes in earlier
jars. This will enable someone to do Nutch development, overriding
or reworking core classes, without touching the main Nutch source
code base. For many of the Nutch programs, a NutchJob is created
that automatically sets the job jar file, which would now be the
first jar file. We wanted to be able to override that when necessary.
Hadoop should provide a way to allow the user to specify jar file
(s) the user job depends on
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Key: HADOOP-1622
URL: https://issues.apache.org/jira/browse/
HADOOP-1622
Project: Hadoop
Issue Type: Improvement
Reporter: Runping Qi
Attachments: multipleJobJars.patch
More likely than not, a user's job may depend on multiple jars.
Right now, when submitting a job through bin/hadoop, there is no
way for the user to specify that.
A walk around for that is to re-package all the dependent jars
into a new jar or put the dependent jar files in the lib dir of
the new jar.
This walk around causes unnecessary inconvenience to the user.
Furthermore, if the user does not own the main function
(like the case when the user uses Aggregate, or datajoin,
streaming), the user has to re-package those system jar files too.
It is much desired that hadoop provides a clean and simple way for
the user to specify a list of dependent jar files at the time
of job submission. Someting like:
bin/hadoop .... --depending_jars j1.jar:j2.jar
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