I am new to spark but am trying to do some development. I am following "Reducing Build Times" instructions from the spark developer page. After creating the normal assembly I have written some classes that are dependent on one specific jar. I test my package in the spark-shell in which I have been able to include my jar by using defining SPARK_CLASSPATH, but the problem lies in actually compiling my code. What I want to achieve is to include that jar when compiling my added package (with build/sbt compile). Could I do that by adding a path to my jar in build/sbt file or sbt-launch-lib.bash, and if so how?
(Side note: I do not want to yet include the jar in the assembly because as I go I make some changes to it, and so it would be inconvenient. I am using Spark 1.4)
Any help is appreciated!
Based on the answer in the comments above, it looks like you are trying to add your jar as a dependency to the the mllib project as you do development on mllib itself. You can accomplish this by modifying the pom.xml file in the mllib directory within the Spark distribution.
You can find instructions on how to add a local file as a dependency here - http://blog.valdaris.com/post/custom-jar/. I haven't used this approach myself to including local file as a dependency, but I think it should work.
Related
I have a scala project built with dependancy on a locally built jar file (java code). Once I need to check in my scala code into a different environment for building and deployment, what's the best way to keep my jar file in the dependancy?
I know that if I use the sbt dependancy from online modules, I don't need to worry, it will download the version and build, but what if I want to use my own jar file for this purpose?
This is in OSX, and code will be checked into linux machines, I am using intellij and sbt to manage my scala project. I also used intellij to build my external java lib into jar file and added dependancy of this specific path.
I hope there should be some generic solution, but I am new in JAVA and SBT
I got it figured out. Add the jar files under the lib directory right under the project will solve the problem. SBT will pick it up automatically and you can certainly check in the jar files like source code.
Im working on a project of frequent item sets, and I use the Algorithm FP-Growth, I depend on the version developed in Scala-Spark
https://github.com/apache/spark/blob/v2.1.0/mllib/src/main/scala/org/apache/spark/mllib/fpm/FPGrowth.scala
I need to modify this code and recompile it to have a jar file that I can include it to Spark-shell , and call its functions in spark
the problem s that spark-shell is un interpreter , and it finds errors in this file, Ive tried Sbt with eclipse but it did not succeded .
what i need is compiler that can use the last version of scala and spark-shel libraries to compile this file to jar file.
Got your question now!
All you need to do is add dependency jars(scala, java, etc.,) with respect to the machine you are going to use you own jar. Later on add the jars to spark-shell and you can use it like below,
spark-shell --jars your_jar.jar
Follow this steps:
check out Spark repository
modify files to want to modify
build project
run ./dev/make-distribution.sh script, which is inside Spark repository
run Spark Shell from your Spark distribution
As I've downloaded a preview distribution of Apache Spark 2.0, I would like to use it within Intellij within a project of mine.
However, the project is not a standard Maven distribution or similar, but rather purely source code scattered through directories.
My question is, how do I import that source code into Intellij?
If you want to contribute to Spark, as in modify spark source code, you can import spark as a maven project.
If you want to write code that uses spark, and need it as a dependency, you can either add the dependency in your intellij project by right clicking on the project, selecting module settings, going to libraries, adding a new library using your jar, then going to the modules section and adding that library as a dependency.
Alternatively (and I think preferably) you could publish the jar to your local maven repo using the following command, and then just depend on it normally in a maven project:
mvn install:install-file -Dfile=<path-to-file> -DgroupId=<group-id> \
-DartifactId=<artifact-id> -Dversion=<version> -Dpackaging=<packaging>
I have no Scala experience, but I need to create a JAR to include on a project's classpath from a single Scala source file.
I'm thinking there is a relatively straightforward way to do this, but I can't seem to figure it out.
The Scala file is here: http://pastebin.com/MYqjNkac
The JAR doesn't need to be executable, it just needs to be able to be referenced from another program.
The most convenient way is to use some build tool like Sbt or Maven. For maven there is the maven-scala-plugin plugin, and for Sbt here is a tutorial.
If you don't want to use any build tool, you may want to compile the code with scalac and then create the jar file manually by using zip on the resulting class files and renaming it to jar. But you have to preserve the directory structure. In your pastebin you use the package org.apache.spark.examples.pythonconverters, so make sure the directories match.
Btw, if you want to just integrate this piece of code with your java project, and using maven, you can have the scala code in your 1 project as well (in src/main/scala). Just use the maven-scala-plugin plugin and hook it to the compile phase, or some sooner phase if your Java code depends on it. However, I don't recommend mixing multiple languages in one project, I would split it into two separate ones.
I am just getting started with Spark, so downloaded the for Hadoop 1 (HDP1, CDH3) binaries from here and extracted it on a Ubuntu VM. Without installing Scala, I was able to execute the examples in the Quick Start guide from the Spark interactive shell.
Does Spark come included with Scala? If yes, where are the libraries/binaries?
For running Spark in other modes (distributed), do I need to install Scala on all the nodes?
As a side note, I observed that Spark has one of the best documentation around open source projects.
Does Spark come included with Scala? If yes, where are the libraries/binaries?
The project configuration is placed in project/ folder. I my case here it is:
$ ls project/
build.properties plugins.sbt project SparkBuild.scala target
When you do sbt/sbt assembly, it downloads appropriate version of Scala along with other project dependencies. Checkout the folder target/ for example:
$ ls target/
scala-2.9.2 streams
Note that Scala version is 2.9.2 for me.
For running Spark in other modes (distributed), do I need to install Scala on all the nodes?
Yes. You can create a single assembly jar as described in Spark documentation
If your code depends on other projects, you will need to ensure they are also present on the slave nodes. A popular approach is to create an assembly jar (or “uber” jar) containing your code and its dependencies. Both sbt and Maven have assembly plugins. When creating assembly jars, list Spark itself as a provided dependency; it need not be bundled since it is already present on the slaves. Once you have an assembled jar, add it to the SparkContext as shown here. It is also possible to submit your dependent jars one-by-one when creating a SparkContext.
Praveen -
checked now the fat-master jar.
/SPARK_HOME/assembly/target/scala-2.9.3/spark-assembly_2.9.3-0.8.0-incubating-hadoop1.0.4.jar
this jar included with all the scala binaries + spark binaries.
you are able to run because this file is added to your CLASSPAH when you run spark-shell
check here : run spark-shell > http:// machine:4040 > environment > Classpath Entries
if you downloaded pre build spark , then you don't need to have scala in nodes, just this file in CLASSAPATH in nodes is enough.
note: deleted the last answer i posted, cause it may mislead some one. sorry :)
You do need Scala to be available on all nodes. However, with the binary distribution via make-distribution.sh, there is no longer a need to install Scala on all nodes. Keep in mind the distinction between installing Scala, which is necessary to run the REPL, and merely packaging Scala as just another jar file.
Also, as mentioned in the file:
# The distribution contains fat (assembly) jars that include the Scala library,
# so it is completely self contained.
# It does not contain source or *.class files.
So Scala does indeed come along for the ride when you use make-distribution.sh.
From spark 1.1 onwards, there is no SparkBuild.scala
You ahve to make your changes in pom.xml and build using Maven