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[Apache Spark](http://spark.apache.org) is the default processing engine for
PredictionIO. Download and extract it.
```
$ wget https://archive.apache.org/dist/spark/spark-<%= data.versions.spark %>/<%= data.versions.spark_download_filename %>.tgz
$ tar zxvfC <%= data.versions.spark_download_filename %>.tgz PredictionIO-<%= data.versions.pio %>/vendors
```
INFO: If you decide to install Apache Spark to another location, you must edit
`PredictionIO-<%= data.versions.pio %>/conf/pio-env.sh` and change the
`SPARK_HOME` variable to point to your own Apache Spark installation.