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This directory contains Hadoop map/reduce jobs written in Scala (compiled to
the JVM) using the Scalding framework.
See the other markdown files in this directory for more background and tips.
## Dependencies
Locally, you need to have the JVM (eg, OpenJDK 1.8), `sbt` build tool, and
might need (exactly) Scala version 2.11.8.
On a debian/ubuntu machine:
echo "deb https://dl.bintray.com/sbt/debian /" | sudo tee -a /etc/apt/sources.list.d/sbt.list
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 2EE0EA64E40A89B84B2DF73499E82A75642AC823
sudo apt-get update
sudo apt install scala sbt
## Building and Running
Run tests:
sbt test
Build a jar and upload to a cluster machine (from which to run in production):
sbt assembly
scp target/scala-2.11/sandcrawler-assembly-0.2.0-SNAPSHOT.jar devbox:
Run on cluster:
devbox$ touch thing.conf
devbox$ hadoop jar sandcrawler-assembly-0.2.0-SNAPSHOT.jar \
com.twitter.scalding.Tool sandcrawler.HBaseRowCountJob --hdfs \
--app.conf.path thing.conf \
--output hdfs:///user/bnewbold/spyglass_out_test
## Troubleshooting
If your `sbt` task fails with this error:
java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: Metaspace
try restarting `sbt` with more memory (e.g., `sbt -mem 2048`).
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