Ah, yes, I believe this is because only properties prefixed with "spark"
get passed on. The purpose of the "--conf" option is to allow passing
Spark properties to the SparkConf, not to add general key-value pairs to
the JVM system properties.
-Sandy
On Tue, Mar 24, 2015 at 4:25 AM, Emre Sevinc <emre.sev...@gmail.com> wrote:
> Hello Sandy,
>
> Your suggestion does not work when I try it locally:
>
> When I pass
>
> --conf "key=someValue"
>
> and then try to retrieve it like:
>
> SparkConf sparkConf = new SparkConf();
> logger.info("* * * key ~~~> {}", sparkConf.get("key"));
>
> I get
>
> Exception in thread "main" java.util.NoSuchElementException: key
>
> And I think that's expected because the key is an arbitrary one, not
> necessarily a Spark configuration element. This is why I was passing it via
> --conf and retrieving System.getProperty("key") (which worked locally and
> in yarn-client mode but not in yarn-cluster mode). I'm surprised why I
> can't use it on the cluster while I can use it while local development and
> testing.
>
> Kind regards,
>
> Emre Sevinç
> http://www.bigindustries.be/
>
>
>
> On Mon, Mar 23, 2015 at 6:15 PM, Sandy Ryza <sandy.r...@cloudera.com>
> wrote:
>
>> Hi Emre,
>>
>> The --conf property is meant to work with yarn-cluster mode.
>> System.getProperty("key") isn't guaranteed, but new SparkConf().get("key")
>> should. Does it not?
>>
>> -Sandy
>>
>> On Mon, Mar 23, 2015 at 8:39 AM, Emre Sevinc <emre.sev...@gmail.com>
>> wrote:
>>
>>> Hello,
>>>
>>> According to Spark Documentation at
>>> https://spark.apache.org/docs/1.2.1/submitting-applications.html :
>>>
>>> --conf: Arbitrary Spark configuration property in key=value format.
>>> For values that contain spaces wrap “key=value” in quotes (as shown).
>>>
>>> And indeed, when I use that parameter, in my Spark program I can
>>> retrieve the value of the key by using:
>>>
>>> System.getProperty("key");
>>>
>>> This works when I test my program locally, and also in yarn-client mode,
>>> I can log the value of the key and see that it matches what I wrote in the
>>> command line, but it returns *null* when I submit the very same program in
>>> *yarn-cluster* mode.
>>>
>>> Why can't I retrieve the value of key given as --conf "key=value" when I
>>> submit my Spark application in *yarn-cluster* mode?
>>>
>>> Any ideas and/or workarounds?
>>>
>>>
>>> --
>>> Emre Sevinç
>>> http://www.bigindustries.be/
>>>
>>>
>>
>
>
> --
> Emre Sevinc
>
