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From Sachin Mittal <sjmit...@gmail.com>
Subject Re: Building standalone spark application via sbt
Date Wed, 20 Jul 2016 08:54:38 GMT
Hi,
I am following the example under
https://spark.apache.org/docs/latest/quick-start.html
For standalone scala application.

I added all my dependencies via build.sbt (one dependency is under lib
folder).

When I run sbt package I see the jar created under
target/scala-2.10/

So compile seems to be working fine. However when I inspect that jar, it
only contains my scala class.
Unlike in java application we build a standalone jar, which contains all
the dependencies inside that jar, here all the dependencies are missing.

So as expected when I run the application via spark-submit I get the
NoClassDefFoundError.

Here is my build.sbt

name := "Test Advice Project"
version := "1.0"
scalaVersion := "2.10.6"
libraryDependencies ++= Seq(
    "org.apache.spark" %% "spark-core" % "1.6.1",
    "org.apache.spark" %% "spark-sql" % "1.6.1"
)

Can anyone please guide me to as what is going wrong and why sbt package is
not including all the dependencies jar classes in the new jar.

Thanks
Sachin


On Tue, Jul 19, 2016 at 8:23 PM, Andrew Ehrlich <andrew@aehrlich.com> wrote:

> Yes, spark-core will depend on Hadoop and several other jars.  Here’s the
> list of dependencies:
> https://github.com/apache/spark/blob/master/core/pom.xml#L35
>
> Whether you need spark-sql depends on whether you will use the DataFrame
> API. Without spark-sql, you will just have the RDD API.
>
> On Jul 19, 2016, at 7:09 AM, Sachin Mittal <sjmittal@gmail.com> wrote:
>
>
> Hi,
> Can someone please guide me what all jars I need to place in my lib folder
> of the project to build a standalone scala application via sbt.
>
> Note I need to provide static dependencies and I cannot download the jars
> using libraryDependencies.
> So I need to provide all the jars upfront.
>
> So far I found that we need:
> spark-core_<version>.jar
>
> Do we also need
> spark-sql_<version>.jar
> and
> hadoop-core-<version>.jar
>
> Is there any jar from spark side I may be missing? What I found that
> spark-core needs hadoop-core classes and if I don't add them then sbt was
> giving me this error:
> [error] bad symbolic reference. A signature in SparkContext.class refers
> to term hadoop
> [error] in package org.apache which is not available.
>
> So I was just confused on library dependency part when building an
> application via sbt. Any inputs here would be helpful.
>
> Thanks
> Sachin
>
>
>
>
>

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