How to share files amongst multiple jobs using Distributed Cache in Hadoop 2.7.2

[Siddharth Dawar <si...@gmail.com>]

Hi,

I wrote a program which creates Map-Reduce jobs in an iterative fashion as
follows:


while (true) {

JobConf conf2  = new JobConf(getConf(),graphMining.class);
conf2.setJobName("sid");conf2.setMapperClass(mapperMiner.class);conf2.setReducerClass(reducerMiner.class);conf2.setInputFormat(SequenceFileInputFormat.class);conf2.setOutputFormat(SequenceFileOutputFormat.class);conf2.setOutputValueClass(BytesWritable.class);conf2.setMapOutputKeyClass(Text.class);conf2.setMapOutputValueClass(MapWritable.class);conf2.setOutputKeyClass(Text.class);

conf2.setNumMapTasks(Integer.parseInt(args[3]));conf2.setNumReduceTasks(Integer.parseInt(args[4]));FileInputFormat.addInputPath(conf2,
new Path(input));FileOutputFormat.setOutputPath(conf2, new
Path(output)); }

RunningJob job = JobClient.runJob(conf2);
}


Now, I want the first Job which gets created to write something in the
distributed cache and the jobs which get created after the first job to
read from the distributed cache.

I came to know that the DistributedCache.addcacheFiles() method is
deprecated, so the documentation suggests to use Job.addcacheFiles() method
specific for each job.

But, I am unable to get an handle of the currently running job, as
JobClient.runJob(conf2) submits a job internally.


How can I share the content written by the first job in this while loop
available via distributed cache to other jobs which get created in later
iterations of while loop ?

Re: How to share files amongst multiple jobs using Distributed Cache in Hadoop 2.7.2

[Siddharth Dawar <si...@gmail.com>]

Hi Arun,

Thanks for your prompt reply. Actually, I want to add files to the job
running internally in

JobClient.RunJob(conf2)

method and add cache files to file.

I am unable to find a way to get the running job.

The method Job.getInstanceOf(conf) creates a new job (but I want to add
file to currently running job only).

On Tue, Jun 7, 2016 at 6:36 PM, Arun Natva <ar...@gmail.com> wrote:

> If you use the Instance of Job class, you can add files to distributed
> cache like this:
> Job job = Job.getInstanceOf(conf);
> job.addCacheFiles(filepath);
>
>
> Sent from my iPhone
>
> On Jun 7, 2016, at 5:17 AM, Siddharth Dawar <si...@gmail.com>
> wrote:
>
> Hi,
>
> I wrote a program which creates Map-Reduce jobs in an iterative fashion as
> follows:
>
>
> while (true) {
>
> JobConf conf2  = new JobConf(getConf(),graphMining.class);
> conf2.setJobName("sid");conf2.setMapperClass(mapperMiner.class);conf2.setReducerClass(reducerMiner.class);conf2.setInputFormat(SequenceFileInputFormat.class);conf2.setOutputFormat(SequenceFileOutputFormat.class);conf2.setOutputValueClass(BytesWritable.class);conf2.setMapOutputKeyClass(Text.class);conf2.setMapOutputValueClass(MapWritable.class);conf2.setOutputKeyClass(Text.class);
>
> conf2.setNumMapTasks(Integer.parseInt(args[3]));conf2.setNumReduceTasks(Integer.parseInt(args[4]));FileInputFormat.addInputPath(conf2, new Path(input));FileOutputFormat.setOutputPath(conf2, new Path(output)); }
>
> RunningJob job = JobClient.runJob(conf2);
> }
>
>
> Now, I want the first Job which gets created to write something in the
> distributed cache and the jobs which get created after the first job to
> read from the distributed cache.
>
> I came to know that the DistributedCache.addcacheFiles() method is
> deprecated, so the documentation suggests to use Job.addcacheFiles() method
> specific for each job.
>
> But, I am unable to get an handle of the currently running job, as
> JobClient.runJob(conf2) submits a job internally.
>
>
> How can I share the content written by the first job in this while loop
> available via distributed cache to other jobs which get created in later
> iterations of while loop ?
>
>

Re: How to share files amongst multiple jobs using Distributed Cache in Hadoop 2.7.2

[Arun Natva <ar...@gmail.com>]

If you use the Instance of Job class, you can add files to distributed cache like this:
Job job = Job.getInstanceOf(conf);
job.addCacheFiles(filepath);


Sent from my iPhone

> On Jun 7, 2016, at 5:17 AM, Siddharth Dawar <si...@gmail.com> wrote:
> 
> Hi,
> 
> I wrote a program which creates Map-Reduce jobs in an iterative fashion as follows:
> 
> 
> while (true) 
> {
> JobConf conf2  = new JobConf(getConf(),graphMining.class);
> 
> conf2.setJobName("sid");
> conf2.setMapperClass(mapperMiner.class);
> conf2.setReducerClass(reducerMiner.class);
> 
> conf2.setInputFormat(SequenceFileInputFormat.class);
> conf2.setOutputFormat(SequenceFileOutputFormat.class);
> conf2.setOutputValueClass(BytesWritable.class);
> 
> conf2.setMapOutputKeyClass(Text.class);
> conf2.setMapOutputValueClass(MapWritable.class);
> conf2.setOutputKeyClass(Text.class);
> 
> conf2.setNumMapTasks(Integer.parseInt(args[3]));
> conf2.setNumReduceTasks(Integer.parseInt(args[4]));
> FileInputFormat.addInputPath(conf2, new Path(input));
> FileOutputFormat.setOutputPath(conf2, new Path(output)); }
> RunningJob job = JobClient.runJob(conf2);
> }
> 
> Now, I want the first Job which gets created to write something in the distributed cache and the jobs which get created after the first job to read from the distributed cache. 
> 
> I came to know that the DistributedCache.addcacheFiles() method is deprecated, so the documentation suggests to use Job.addcacheFiles() method specific for each job.
> 
> But, I am unable to get an handle of the currently running job, as JobClient.runJob(conf2) submits a job internally.
> 
> 
> How can I share the content written by the first job in this while loop available via distributed cache to other jobs which get created in later iterations of while loop ? 
>