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MapReduce >> mail # dev >> What is the role of hadoop-core-*.jar?


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Yoonmin Nam 2014-01-28, 09:00
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Re: What is the role of hadoop-core-*.jar?
Grab the source from SVN/git and import it into your chosen IDE -it'll show
you whats in the JAR and what's not
On 28 January 2014 09:00, Yoonmin Nam <[EMAIL PROTECTED]> wrote:

> Hello, everyone!
>
>
>
> As you can see in the title, I am curious about the exact role of the
> hadoop-core-*.jar file.
>
>
>
> At first I thought it contains every compiled hadoop source files, so It is
> necessary for starting every component of Hadoop such as DataNode and
> TaskTracker.
>
>
>
> However, even I deleted all hadoop-core-*.jar file in the hadoop home
> folder, the script "start-all.sh" runs successfully.
>
>
>
> It is strongly related to the classpath, but I am not sure about that.
>
>
>
> In addition, when I distributed newly packaged hadoop-core-*.jar file which
> contains changed source codes for doing some experiments, the changed
> contents are not effected.
>
> This means original, unmodified compiled contents are working in the
> cluster.
>
> So, I cannot see from the one line of log to the some logic to improve
> HDFS.
>
>
>
> Why this issues happens to me?
>
> Is there anyone who let me know about this issue?
>
>
>
> Thank you!
>
>

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