Github user steveloughran commented on the pull request:
https://github.com/apache/spark/pull/12004#issuecomment-217536672
For anyone trying to run these tests, they'll need a test xml file and
refer to it
```
mvn test -Phadoop-2.6 -Dcloud.test.configuration.file=../cloud.xml
```
The referenced file uses XInclude to input the AWS credentials which I keep
a long way away from SCM-managed directories.
```xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
~ Licensed to the Apache Software Foundation (ASF) under one
~ or more contributor license agreements. See the NOTICE file
~ distributed with this work for additional information
~ regarding copyright ownership. The ASF licenses this file
~ to you under the Apache License, Version 2.0 (the
~ "License"); you may not use this file except in compliance
~ with the License. You may obtain a copy of the License at
~
~ http://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
-->
<configuration>
<include xmlns="http://www.w3.org/2001/XInclude";
href="file:///home/stevel/.aws/keys.xml"/>
<property>
<name>aws.tests.enabled</name>
<value>true</value>
</property>
<property>
<name>s3a.test.uri</name>
<value>s3a://test-eu1</value>
</property>
</configuration>
```
All the test suites will be designed to run iff the relevant enabled.flag
is set; this is why there's a new method to declare tests, `ctest(key: String,
summary: String, detail: String)(testFun: => Unit): Unit`
these tests are not only conditional on the suite being enabled, they each
have a key which can be explicitly named from the build in the
`test.method.keys` attr. This allows explicit methods to be named the way the
current maven surefire runner doesn't; the time it can take to run individual
tests makes this feature invaluable during iterative development.
```scala
ctest("CSVgz", "Read compressed CSV",
"Read compressed CSV files through the spark context") {
val source = SceneList
sc = new SparkContext("local", "test", newSparkConf(source))
val sceneInfo = getFS(source).getFileStatus(source)
logInfo(s"Compressed size = ${sceneInfo.getLen}")
validateCSV(sc, source)
logInfo(s"Filesystem statistics ${getFS(source)}")
}
```
For best performance, you need a build of hadoop which has as much of
[HADOOP-11694](https://issues.apache.org/jira/browse/HADOOP-11694) applied,
especially HADOOP-12444, lazy seek (in branch-2.8 already), and
[HADOOP-13028](https://issues.apache.org/jira/browse/HADOOP-13028)
```
mvn test -Phadoop-2.7 -DwildcardSuites=org.apache.spark.cloud.s3.S3aIOSuite
\
-Dcloud.test.configuration.file=../cloud.xml \
-Dhadoop.version=2.9.0-SNAPSHOT \
-Dtest.method.keys=CSVgz
```
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