Thank you, Ryan. Didn’t there is a method for that!
> On Dec 5, 2016, at 4:10 PM, Shixiong(Ryan) Zhu <shixi...@databricks.com>
> wrote:
>
> RDD.sparkContext is public:
> http://spark.apache.org/docs/latest/api/scala/index.html#org.apache.spark.rdd.RDD@sparkContext:org.apache.spark.SparkContext
>
> <http://spark.apache.org/docs/latest/api/scala/index.html#org.apache.spark.rdd.RDD@sparkContext:org.apache.spark.SparkContext>
>
> On Mon, Dec 5, 2016 at 1:04 PM, Teng Long <longteng...@gmail.com
> <mailto:longteng...@gmail.com>> wrote:
> Thank you for providing another answer, Holden.
>
> So I did what Tarun and Michal suggested, and it didn’t work out as I want to
> have a new transformation method in RDD class, and need to use that RDD’s
> spark context which is private. So I guess the only thing I can do now is to
> sbt publishLocal?
>
>> On Dec 5, 2016, at 9:19 AM, Holden Karau <hol...@pigscanfly.ca
>> <mailto:hol...@pigscanfly.ca>> wrote:
>>
>> Doing that requires publishing a custom version of Spark, you can edit the
>> version number do do a publishLocal - but maintaining that change is going
>> to be difficult. The other approaches suggested are probably better, but
>> also does your method need to be defined on the RDD class? Could you instead
>> make a helper object or class to expose whatever functionality you need?
>>
>> On Mon, Dec 5, 2016 at 6:06 PM long <longteng...@gmail.com
>> <mailto:longteng...@gmail.com>> wrote:
>> Thank you very much! But why can’t I just add new methods in to the source
>> code of RDD?
>>
>>
>>> On Dec 5, 2016, at 3:15 AM, Michal Šenkýř [via Apache Spark Developers
>>> List] <[hidden email] <http://user/SendEmail.jtp?type=node&node=20107&i=0>>
>>> wrote:
>>>
>>
>>> A simple Scala example of implicit classes:
>>>
>>> implicit class EnhancedString(str: String) {
>>> def prefix(prefix: String) = prefix + str
>>> }
>>>
>>> println("World".prefix("Hello "))
>>> As Tarun said, you have to import it if it's not in the same class where
>>> you use it.
>>>
>>> Hope this makes it clearer,
>>>
>>> Michal Senkyr
>>>
>>>
>>> On 5.12.2016 07:43, Tarun Kumar wrote:
>>
>>>> Not sure if that's documented in terms of Spark but this is a fairly
>>>> common pattern in scala known as "pimp my library" pattern, you can easily
>>>> find many generic example of using this pattern.
>>>>
>>>> If you want I can quickly cook up a short conplete example with
>>>> rdd(although there is nothing really more to my example in earlier mail) ?
>>>>
>>>> Thanks
>>>> Tarun Kumar
>>>>
>>
>>>> On Mon, 5 Dec 2016 at 7:15 AM, long <<a
>>>> href="x-msg://22/user/SendEmail.jtp?type=node&node=20106&i=0 <>"
>>>> target="_top" rel="nofollow" link="external" class="">[hidden email]>
>>>> wrote:
>>
>>>> So is there documentation of this I can refer to?
>>>>
>>>>> On Dec 5, 2016, at 1:07 AM, Tarun Kumar [via Apache Spark Developers
>>>>> List] <[hidden email]
>>>>> <http://user/SendEmail.jtp?type=node&node=20104&i=0>> wrote:
>>>>>
>>>>
>>>>> Hi Tenglong,
>>>>>
>>>>> In addition to trsell's reply, you can add any method to an rdd without
>>>>> making changes to spark code.
>>>>>
>>>>> This can be achieved by using implicit class in your own client code:
>>>>>
>>>>> implicit class extendRDD[T](rdd: RDD[T]){
>>>>>
>>>>> def foo()
>>>>>
>>>>> }
>>>>>
>>>>> Then you basically nees to import this implicit class in scope where you
>>>>> want to use the new foo method.
>>>>>
>>>>> Thanks
>>>>> Tarun Kumar
>>>>>
>>
>>>>> On Mon, 5 Dec 2016 at 6:59 AM, <<a href="<a
>>>>> href="x-msg://19/user/SendEmail.jtp?type=node&amp;node=20102&amp;i=0
>>>>> <>"
>>>>> class="">x-msg://19/user/SendEmail.jtp?type=node&node=20102&i=0
>>>>> <>" target="_top" rel="nofollow" link="external" class="">[hidden email]>
>>>>> wrote:
>>>>
>>>>> How does your application fetch the spark dependency? Perhaps list your
>>>>> project dependencies and check it's using your dev build.
>>>>>
>>>>>
>>
>>>>> On Mon, 5 Dec 2016, 08:47 tenglong, <<a href="<a
>>>>> href="x-msg://19/user/SendEmail.jtp?type=node&amp;node=20102&amp;i=1
>>>>> <>"
>>>>> class="">x-msg://19/user/SendEmail.jtp?type=node&node=20102&i=1
>>>>> <>" target="_top" rel="nofollow" link="external" class="">[hidden email]>
>>>>> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> Apparently, I've already tried adding a new method to RDD,
>>>>>
>>>>> for example,
>>>>>
>>>>> class RDD {
>>>>> def foo() // this is the one I added
>>>>>
>>>>> def map()
>>>>>
>>>>> def collect()
>>>>> }
>>>>>
>>>>> I can build Spark successfully, but I can't compile my application code
>>>>> which calls rdd.foo(), and the error message says
>>>>>
>>>>> value foo is not a member of org.apache.spark.rdd.RDD[String]
>>>>>
>>>>> So I am wondering if there is any mechanism prevents me from doing this or
>>>>> something I'm doing wrong?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
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