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From Oleg Ruchovets <oruchov...@gmail.com>
Subject Re: execute hadoop job from remote web application
Date Tue, 18 Oct 2011 15:43:02 GMT
I  try to be more specific. It is not dependent jar. It is a jar which
contains map/reduce/combine classes and some business logic.
  executing our job from command line, class which parse parameters and
submit a job has a line of code:
    job.setJarByClass(HadoopJobExecutor.class);

we execute it locally on hadoop master machine using command such command:
opt/hadoop/bin/hadoop jar /opt/hadoop/hadoop-jobs/my_hadoop_job.jar
-inputPath /opt/inputs/  -outputPath /data/output_jobs/output

and of course my_hadoop_job.jar  is found because it is located on the same
machine.

Now , suppose I am going to submit job remotely (from web applications).
 and I have the same line of code
job.setJarByClass(HadoopJobExecutor.class);

 In case my_hadoop_job.jar located on remote hadoop machine  (in class path)
, my jobClient will failed because there is no job jar in class path ( it is
located on remote hadoop machine). Am I write? I simply don't know how to
submit a job remotely (in my case job is not a map/combine/reduce classes it
is a jar which contains other classes too).

Regarding remotely invoke the shellscript that contains the hadoop jar
command with
any required input arguments.
    It is possible to do it  by Runtime.getRuntime().exec(
submitCommand.toString().split( " " ) );
But I prefer to use jobClient , because I can monitor my job (get counters
and other useful information).

Thanks in advance
Oleg.

On Tue, Oct 18, 2011 at 4:34 PM, Bejoy KS <bejoy.hadoop@gmail.com> wrote:

> Hi Oleg
>          I haven't tried out a scenario like you mentioned. But I think
> there shouldn't be any issue in submitting a job that has some dependent
> classes which holds the business logic referred from mapper,reducer or
> combiner. You should be able to do the job submission remotely the same we
> were discussing in this thread. If you need to distribute any dependent
> jars/files along with the application jar, you can use the -libjars option
> in CLI or use the DistributedCache methods like
> addArchiveToClassPath()/addFileToClassPath() in your java code. If it is a
> dependent jar It is better to deploy the same in the cluster environment
> itself so that every time when you submit your job you don't have to
> transfer the jar over the network again and again.
>         Just a suggestion, if you can execute the job from within your
> hadoop cluster you don't have to do a remote job submission. You just need
> to remotely invoke the shellscript that contains the hadoop jar command
> with
> any required input arguments. Sorry if I'm not getting your requirement
> exactly.
>
> Regards
> Bejoy.K.S
>
> On Tue, Oct 18, 2011 at 6:29 PM, Oleg Ruchovets <oruchovets@gmail.com
> >wrote:
>
> > Thanks  you all for your answers but I still have a questions:
> >  Currently we running our jobs using shell scripts which locates on
> hadoop
> > master machine.
> >
> > Here is an example of command line:
> > /opt/hadoop/bin/hadoop jar /opt/hadoop/hadoop-jobs/my_hadoop_job.jar
> > -inputPath /opt/inputs/  -outputPath /data/output_jobs/output
> >
> > my_hadoop_job.jar has a class which parse input parameters and submit a
> > job.
> > Our code is very similar like you wrote:
> >   ......
> >
> >        job.setJarByClass(HadoopJobExecutor.class);
> >        job.setMapperClass(MultipleOutputMap.class);
> >        job.setCombinerClass(BaseCombine.class);
> >        job.setReducerClass(HBaseReducer.class);
> >        job.setOutputKeyClass(Text.class);
> >        job.setOutputValueClass(MapWritable.class);
> >
> >        FileOutputFormat.setOutputPath(job, new Path(finalOutPutPath));
> >
> >        jobCompleteStatus = job.waitForCompletion(true);
> > ...............
> >
> > my question are:
> >
> > 1) my_hadoop_job.jar contains another classes (business logic) not only
> > Map,Combine,Reduce classes and I still don't understand how can I submit
> > job
> > which needs all classes from my_hadoop_job.jar?
> > 2) Do I need to submit a my_hadoop_job.jar too? If yes what is the way to
> > do
> > it?
> >
> > Thanks In Advance
> > Oleg.
> >
> > On Tue, Oct 18, 2011 at 2:11 PM, Uma Maheswara Rao G 72686 <
> > maheswara@huawei.com> wrote:
> >
> > > ----- Original Message -----
> > > From: Bejoy KS <bejoy.hadoop@gmail.com>
> > > Date: Tuesday, October 18, 2011 5:25 pm
> > > Subject: Re: execute hadoop job from remote web application
> > > To: common-user@hadoop.apache.org
> > >
> > > > Oleg
> > > >      If you are looking at how to submit your jobs using
> > > > JobClient then the
> > > > below sample can give you a start.
> > > >
> > > > //get the configuration parameters and assigns a job name
> > > >        JobConf conf = new JobConf(getConf(), MyClass.class);
> > > >        conf.setJobName("SMS Reports");
> > > >
> > > >        //setting key value types for mapper and reducer outputs
> > > >        conf.setOutputKeyClass(Text.class);
> > > >        conf.setOutputValueClass(Text.class);
> > > >
> > > >        //specifying the custom reducer class
> > > >        conf.setReducerClass(SmsReducer.class);
> > > >
> > > >        //Specifying the input directories(@ runtime) and Mappers
> > > > independently for inputs from multiple sources
> > > >        FileInputFormat.addInputPath(conf, new Path(args[0]));
> > > >
> > > >        //Specifying the output directory @ runtime
> > > >        FileOutputFormat.setOutputPath(conf, new Path(args[1]));
> > > >
> > > >        JobClient.runJob(conf);
> > > >
> > > > Along with the hadoop jars you may need to have the config files
> > > > as well on
> > > > your client.
> > > >
> > > > The sample is from old map reduce API. You can use the new one as
> > > > well in
> > > > that we use the Job instead of JobClient.
> > > >
> > > > Hope it helps!..
> > > >
> > > > Regards
> > > > Bejoy.K.S
> > > >
> > > >
> > > > On Tue, Oct 18, 2011 at 5:00 PM, Oleg Ruchovets
> > > > <oruchovets@gmail.com>wrote:
> > > > > Excellent. Can you give a small example of code.
> > > > >
> > > Good samle by Bejoy
> > > hope, you have access for this site.
> > > Also please go through this docs,
> > >
> > >
> >
> http://hadoop.apache.org/common/docs/r0.20.2/mapred_tutorial.html#Example%3A+WordCount+v2.0
> > > Here is the wordcount example.
> > >
> > > > >
> > > > > On Tue, Oct 18, 2011 at 1:13 PM, Uma Maheswara Rao G 72686 <
> > > > > maheswara@huawei.com> wrote:
> > > > >
> > > > > >
> > > > > > ----- Original Message -----
> > > > > > From: Oleg Ruchovets <oruchovets@gmail.com>
> > > > > > Date: Tuesday, October 18, 2011 4:11 pm
> > > > > > Subject: execute hadoop job from remote web application
> > > > > > To: common-user@hadoop.apache.org
> > > > > >
> > > > > > > Hi , what is the way to execute hadoop job on remote
> > > > cluster. I
> > > > > > > want to
> > > > > > > execute my hadoop job from remote web  application , but
I
> > > > didn't> > > find any
> > > > > > > hadoop client (remote API) to do it.
> > > > > > >
> > > > > > > Please advice.
> > > > > > > Oleg
> > > > > > >
> > > > > > You can put the Hadoop jars in your web applications classpath
> > > > and find
> > > > > the
> > > > > > Class JobClient and submit the jobs using it.
> > > > > >
> > > > > > Regards,
> > > > > > Uma
> > > > > >
> > > > > >
> > > > >
> > > >
> > > Regards
> > > Uma
> > >
> >
>

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