Java example of using broadcast

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Java example of using broadcast

Sen, Ranjan [USA]
Hi Patrick

Yes I get it. 

I have a different question now - (changed the sub) 

Can anyone point me to a Java example of using broadcast variables?

- Ranjan

From: Patrick Wendell <[hidden email]>
Reply-To: "[hidden email]" <[hidden email]>
Date: Monday, March 10, 2014 at 1:24 PM
To: "[hidden email]" <[hidden email]>
Subject: Re: [External] Re: no stdout output from worker

Hey Sen,

Suarav is right, and I think all of your print statements are inside of the driver program rather than inside of a closure. How are you running your program (i.e. what do you run that starts this job)? Where you run the driver you should expect to see the output.

- Patrick

On Mon, Mar 10, 2014 at 8:56 AM, Sen, Ranjan [USA] <[hidden email]> wrote:
Hi Sourav
That makes so much sense. Thanks much. 

From: Sourav Chandra <[hidden email]>
Reply-To: "[hidden email]" <[hidden email]>
Date: Sunday, March 9, 2014 at 10:37 PM
To: "[hidden email]" <[hidden email]>
Subject: Re: [External] Re: no stdout output from worker

Hi Ranjan,

Whatever code is being passed as closure to spark operations like map, flatmap, filter etc are part of task

All others are in driver.


On Mon, Mar 10, 2014 at 12:03 PM, Sen, Ranjan [USA] <[hidden email]> wrote:
Hi Patrick

How do I know which part of the code is in the driver and which in task?
The structure of my code is as below-


Static boolean done=false;

Public static void main(..


JavaRDD<String> lines = ..


While (!done) {

While (..) {

JavaPairRDD<Integer, List<Integer>> labs1 = (new PairFunction<Š );

!! Here I have System.out.println (A)

} // inner while

!! Here I have System.out.println (B)

If (Š) {
        Done = true;

        !! Also here some System.out.println  (C)


Else {

        If (Š) {

                !! More System.out.println  (D)

                labs =Š) ;


} // outer while

!! Even more System.out.println  (E)

} // main

} //class

I get the console outputs on the master for (B) and (E). I do not see any
stdout in the worker node. I find the stdout and stderr in the
<spark>/work/<appid>/0/. I see output
in stderr but not in stdout.

I do get all the outputs on the console when I run it in local mode.

Sorry I am new and may be asking some naïve question but it is really
confusing to me. Thanks for your help.


On 3/9/14, 10:50 PM, "Patrick Wendell" <[hidden email]> wrote:

>Hey Sen,
>Is your code in the driver code or inside one of the tasks?
>If it's in the tasks, the place you would expect these to be is in
>stdout file under <spark>/<appid>/work/[stdout/stderr]. Are you seeing
>at least stderr logs in that folder? If not then the tasks might not
>be running on the workers machines. If you see stderr but not stdout
>that's a bit of a puzzler since they both go through the same
>- Patrick
>On Sun, Mar 9, 2014 at 2:32 PM, Sen, Ranjan [USA] <[hidden email]>
>> Hi
>> I have some System.out.println in my Java code that is working ok in a
>> environment. But when I run the same code on a standalone  mode in a EC2
>> cluster I do not see them at the worker stdout (in the worker node under
>> <spark location>/work ) or at the driver console. Could you help me
>> understand how do I troubleshoot?
>> Thanks
>> Ranjan


Sourav Chandra

Senior Software Engineer

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