RDD.sparkContext is public: 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> 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> 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> 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? >> >> >> >> >> -- >> View this message in context: http://apache-spark- >> developers-list.1001551.n3.nabble.com/Can-I-add-a-new- >> method-to-RDD-class-tp20100.html >> Sent from the Apache Spark Developers List mailing list archive at >> Nabble.com <http://nabble.com/>. >> >> --------------------------------------------------------------------- >> >> To unsubscribe e-mail: <a href="<a href="x-msg://19/user/ >> SendEmail.jtp?type=node&amp;node=20102&amp;i=2" class=""> >> x-msg://19/user/SendEmail.jtp?type=node&node=20102&i=2" >> target="_top" rel="nofollow" link="external" class="">[hidden email] >> >> >> >> ------------------------------ >> If you reply to this email, your message will be added to the discussion >> below: >> http://apache-spark-developers-list.1001551.n3. >> nabble.com/Can-I-add-a-new-method-to-RDD-class-tp20100p20102.html >> To unsubscribe from Can I add a new method to RDD class?, click here. >> NAML >> <http://apache-spark-developers-list.1001551.n3.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> >> >> >> ------------------------------ >> View this message in context: Re: Can I add a new method to RDD class? >> <http://apache-spark-developers-list.1001551.n3.nabble.com/Can-I-add-a-new-method-to-RDD-class-tp20100p20104.html> >> Sent from the Apache Spark Developers List mailing list archive >> <http://apache-spark-developers-list.1001551.n3.nabble.com/> at >> Nabble.com <http://nabble.com/>. >> >> If you reply to this email, your message will be added to the discussion >> below: >> >> http://apache-spark-developers-list.1001551.n3. >> nabble.com/Can-I-add-a-new-method-to-RDD-class-tp20100p20106.html >> >> To unsubscribe from Can I add a new method to RDD class?, click here. >> NAML >> <http://apache-spark-developers-list.1001551.n3.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> >> >> >> ------------------------------ >> View this message in context: Re: Can I add a new method to RDD class? >> <http://apache-spark-developers-list.1001551.n3.nabble.com/Can-I-add-a-new-method-to-RDD-class-tp20100p20107.html> >> Sent from the Apache Spark Developers List mailing list archive >> <http://apache-spark-developers-list.1001551.n3.nabble.com/> at >> Nabble.com. >> > >
