Heroku Slug size at 222 MB / Play Framework 2.1 /

Question

My app slug size on Heroku indicates 222 mb. Quite huge and beyond the 200MB allowed.

Thus, I've inspected these things:

• Inspect my source code size: 89,9 Mo knowing that 80,2 Mo comes from to play app's target folder.

• Check my .gitignore file to be sure that play app's target folder is well excluded. Here my .gitignore file:

.DS_Store         
logs   
project/project    
project/target   
target                 // target well precised here
tmp     
.history    
dist      
/.idea     
/ *.iml  //space here otherwise appears as a comment here    
/out     
/.idea_modules    
/.classpath    
/.project    
/RUNNING_PID     
/.settings

Check my SBT ivy cache size: 100,9 Mo

Here the size of each folder (on the left) in detail:

MikaPc:cache Mika$ du -xak .|sort -n|tail -50
1664 ./org.neo4j/neo4j/docs 1664 ./org.neo4j/neo4j/docs/neo4j-1.9.M05-javadoc.jar
1668 ./org.neo4j/neo4j-kernel/docs
1668 ./org.neo4j/neo4j-kernel/docs/neo4j-kernel-1.9.M05-javadoc.jar
1680 ./org.springframework/spring-test 1748 ./org.neo4j/neo4j
1752 ./org.aspectj/aspectjweaver/jars
1752 ./org.aspectj/aspectjweaver/jars/aspectjweaver-1.7.1.jar
1860 ./org.springframework/spring-jdbc
1888 ./org.springframework.data/spring-data-commons
1980 ./org.scala-sbt/main/jars
1980 ./org.scala-sbt/main/jars/main-0.12.2.jar
1992 ./org.scala-sbt/main
2100 ./org.springframework/spring-context/docs
2100 ./org.springframework/spring-context/docs/spring-context-3.2.0.RELEASE-javadoc.jar 2104 ./com.sun.jersey 2348 ./org.springframework/spring-core
2356 ./org.springframework.data/spring-data-neo4j
2404 ./org.springframework/spring-beans
2776 ./org.apache.lucene/lucene-core
2800 ./org.springframework/spring-web
2808 ./org.springframework/spring-webmvc
2812 ./org.aspectj/aspectjweaver/docs
2812 ./org.aspectj/aspectjweaver/docs/aspectjweaver-1.7.1-javadoc.jar 2844 ./org.apache.lucene 3016 ./org.neo4j/neo4j-kernel/jars
3820 ./org.springframework/spring-context
4356 ./org.neo4j/neo4j-cypher/jars
4356 ./org.neo4j/neo4j-cypher/jars/neo4j-cypher-1.9.M05.jar
4436 ./org.specs2/specs2_2.10/docs
4436 ./org.specs2/specs2_2.10/docs/specs2_2.10-1.13.1-SNAPSHOT-javadoc.jar 4584 ./org.scalaz/scalaz-core_2.10/docs
4584 ./org.scalaz/scalaz-core_2.10/docs/scalaz-core_2.10-7.0-SNAPSHOT-javadoc.jar 4824 ./org.neo4j/neo4j-cypher 5712 ./org.neo4j/neo4j-kernel
5936 ./org.aspectj/aspectjweaver
6024 ./org.springframework.data 6484 ./org.aspectj
6520 ./org.specs2/specs2_2.10/jars
6520 ./org.specs2/specs2_2.10/jars/specs2_2.10-1.13.1-SNAPSHOT.jar
6812 ./org.scala-sbt 8288 ./org.scalaz/scalaz-core_2.10/jars
8288 ./org.scalaz/scalaz-core_2.10/jars/scalaz-core_2.10-7.0-SNAPSHOT.jar 11500 ./org.specs2/specs2_2.10 11524 ./org.specs2
13132 ./org.scalaz/scalaz-core_2.10 13140 ./org.scalaz
15832 ./org.neo4j 23500 ./org.springframework
98552 .

My SBT build file contains the following dependencies:

val appDependencies = Seq(
    jdbc,
    anorm,
    "org.springframework" % "spring-aop" % "3.2.0.RELEASE",
    "org.springframework" % "spring-aspects" % "3.2.0.RELEASE",
    "org.springframework" % "spring-beans" % "3.2.0.RELEASE",
    "org.springframework.data" % "spring-data-commons-core" % "1.4.1.RELEASE",
    "org.springframework" % "spring-expression" % "3.2.0.RELEASE",
    "org.springframework" % "spring-jdbc" % "3.2.0.RELEASE",
    "org.springframework" % "spring-orm" % "3.2.0.RELEASE",
    "org.springframework" % "spring-test" % "3.2.0.RELEASE",
    "org.springframework" % "spring-tx" % "3.2.0.RELEASE",
    "org.springframework.data" % "spring-data-neo4j" % "2.2.0.RELEASE" excludeAll(
      ExclusionRule(organization = "com.sun.jdmk"),
      ExclusionRule(organization = "com.sun.jmx"),
      ExclusionRule(organization = "javax.jms")
      ),
    "org.neo4j" % "neo4j" % "1.9.M05" excludeAll(
        ExclusionRule(organization = "org.neo4j", name="neo4j-kernel")
      ),
    "org.neo4j" % "neo4j-kernel" % "1.9.M05" % "test" classifier "tests" classifier "",
    "asm" % "asm-all" % "3.1",
    "org.springframework.data" % "spring-data-neo4j-rest" % "2.1.0.RELEASE" excludeAll(
      ExclusionRule(organization = "org.neo4j")
      ),
     "org.neo4j" % "neo4j-rest-graphdb" % "1.9.M04",
     "org.scalaz" %% "scalaz-core" % "7.0-SNAPSHOT" withSources(),
     "org.specs2" %% "specs2" % "1.13.1-SNAPSHOT" % "test" withSources(),
     "org.mockito" % "mockito-all" % "1.9.0" %"test",
     "securesocial" %% "securesocial" % "master-SNAPSHOT" withSources()
  )

What could I do to reduce this huge slug size? Even if I remove some documentations and jars sources, size would be huge.

It really seems that play app's target folder is sent .. despite of .gitignore file

Of course, I've created my Heroku app using this buildpack: https://github.com/heroku/heroku-buildpack-scala

Besides, is there a way to precise in SBT (or play configuration), that certains dependencies like Specs2 (testing) should not be downloaded in Heroku production environment?

EDIT ---------

I've run the following command to show the actual size of what I pushed on Heroku:

MikaPc:wwa Mika$ heroku run bash    
Running `bash` attached to terminal... up, run.9266        
~ $ du -h --apparent-size --max-depth 2       
5.3K    ./test/resources         
12K ./test/unit         
5.6K    ./test/functional          
6.5K    ./test/context          
8.5K    ./test/acceptance         
5.2K    ./test/integration         
47K ./test           
5.0K    ./app/helpers          
33K ./app/controllers           
11K ./app/models          
161K    ./app/assets          
34K ./app/views           
8.0K    ./app/applicationservices           
5.0K    ./app/repositories           
20K ./app/utils           
281K    ./app             
8.7M    ./target/scala-2.10           
1.4M    ./target/resolution-cache          
143K    ./target/streams             
60M ./target/staged           
71M ./target          
1.1M    ./.sbt_home/bin          
834K    ./.sbt_home/.sbt           
1.9M    ./.sbt_home         
30K ./public/images            
171K    ./public/javascripts          
9.6K    ./public/stylesheets         
214K    ./public         
4.0K    ./.ivy2/cache        
8.0K    ./.ivy2         
1.1M    ./.jdk/bin         
19M ./.jdk/lib         
203K    ./.jdk/include          
227M    ./.jdk/jre           
247M    ./.jdk             
2.8M    ./project/target          
20K ./project/project            
53M ./project/boot           
56M ./project         
12K ./conf           
375M    .         

375 Mo before compression I imagine ending up to 222Mo .. hum

And the winner is: 227M ./.jdk/jre taking part of the slug size. Is it...normal?

Answer 1

Heroku has recently changed the way that the JDK we deploy with your app is built. It's now a lot larger than previously. We have also upped the slug size limit so this is not going to impede your app other than making releases a little slower.

We'll get the docs updated to match the actual current limits.