Merge branch 'master' into fix-pyspark

docs/contributing/features.md

@@ -26,7 +26,7 @@ If there's agreement that the feature belongs in one or more of the core stacks:
 1. Implement the feature in a local clone of the `jupyter/docker-stacks` project.
 2. Please build the image locally before submitting a pull request. Building the image locally shortens the debugging cycle by taking some load off [Travis CI](http://travis-ci.org/), which graciously provides free build services for open source projects like this one.  If you use `make`, call:
 ```
-make image/somestack-notebook
+make build/somestack-notebook
 ```
 3. [Submit a pull request](https://github.com/PointCloudLibrary/pcl/wiki/A-step-by-step-guide-on-preparing-and-submitting-a-pull-request) (PR) with your changes.
 4. Watch for Travis to report a build success or failure for your PR on GitHub.

docs/contributing/packages.md

@@ -8,7 +8,7 @@ Please follow the process below to update a package version:
 2. Adjust the version number for the package. We prefer to pin the major and minor version number of packages so as to minimize rebuild side-effects when users submit pull requests (PRs). For example, you'll find the Jupyter Notebook package, `notebook`, installed using conda with `notebook=5.4.*`.
 3. Please build the image locally before submitting a pull request. Building the image locally shortens the debugging cycle by taking some load off [Travis CI](http://travis-ci.org/), which graciously provides free build services for open source projects like this one. If you use `make`, call:
 ```
-make image/somestack-notebook
+make build/somestack-notebook
 ```
 4. [Submit a pull request](https://github.com/PointCloudLibrary/pcl/wiki/A-step-by-step-guide-on-preparing-and-submitting-a-pull-request) (PR) with your changes.
 5. Watch for Travis to report a build success or failure for your PR on GitHub.

docs/contributing/tests.md

@@ -14,7 +14,7 @@ Please follow the process below to add new tests:
 2. If your test should run against a single image, add your test code to one of the modules in `some-notebook/test/` or create a new module.
 3. Build one or more images you intend to test and run the tests locally. If you use `make`, call:
 ```
-make image/somestack-notebook
+make build/somestack-notebook
 make test/somestack-notebook
 ```
 4. [Submit a pull request](https://github.com/PointCloudLibrary/pcl/wiki/A-step-by-step-guide-on-preparing-and-submitting-a-pull-request) (PR) with your changes.

pyspark-notebook/Dockerfile

@@ -15,8 +15,10 @@ RUN apt-get -y update && \
     apt-get install --no-install-recommends -y openjdk-8-jre-headless ca-certificates-java && \
     rm -rf /var/lib/apt/lists/*
 
+# Using the preferred mirror to download the file
 RUN cd /tmp && \
-    wget -q http://mirrors.ukfast.co.uk/sites/ftp.apache.org/spark/spark-${APACHE_SPARK_VERSION}/spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}.tgz && \
+    wget -q $(wget -qO- https://www.apache.org/dyn/closer.lua/spark/spark-${APACHE_SPARK_VERSION}/spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}.tgz\?as_json | \
+    python -c "import sys, json; content=json.load(sys.stdin); print(content['preferred']+content['path_info'])") && \
     echo "2426a20c548bdfc07df288cd1d18d1da6b3189d0b78dee76fa034c52a4e02895f0ad460720c526f163ba63a17efae4764c46a1cd8f9b04c60f9937a554db85d2 *spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}.tgz" | sha512sum -c - && \
     tar xzf spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}.tgz -C /usr/local --owner root --group root --no-same-owner && \
     rm spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}.tgz