## What changes were proposed in this pull request?

- Remove Scala 2.10 build profiles and support
- Replace some 2.10 support in scripts with commented placeholders for 2.12 later
- Remove deprecated API calls from 2.10 support
- Remove usages of deprecated context bounds where possible
- Remove Scala 2.10 workarounds like ScalaReflectionLock
- Other minor Scala warning fixes

## How was this patch tested?

Existing tests

Author: Sean Owen <sowen@cloudera.com>

Closes #17150 from srowen/SPARK-19810.

- Move external/java8-tests tests into core, streaming, sql and remove
- Remove MaxPermGen and related options
- Fix some reflection / TODOs around Java 8+ methods
- Update doc references to 1.7/1.8 differences
- Remove Java 7/8 related build profiles
- Update some plugins for better Java 8 compatibility
- Fix a few Java-related warnings

For the future:

- Update Java 8 examples to fully use Java 8
- Update Java tests to use lambdas for simplicity
- Update Java internal implementations to use lambdas

## How was this patch tested?

Existing tests

Author: Sean Owen <sowen@cloudera.com>

Closes #16871 from srowen/SPARK-19493.

## What changes were proposed in this pull request?
This PR is to upgrade:
```
   sbt: 0.13.11 -> 0.13.13,
   zinc: 0.3.9 -> 0.3.11,
   maven-assembly-plugin: 2.6 -> 3.0.0
   maven-compiler-plugin: 3.5.1 -> 3.6.
   maven-jar-plugin: 2.6 -> 3.0.2
   maven-javadoc-plugin: 2.10.3 -> 2.10.4
   maven-source-plugin: 2.4 -> 3.0.1
   org.codehaus.mojo:build-helper-maven-plugin: 1.10 -> 1.12
   org.codehaus.mojo:exec-maven-plugin: 1.4.0 -> 1.5.0
```

The sbt release notes since the last version we used are: [v0.13.12](https://github.com/sbt/sbt/releases/tag/v0.13.12)  and [v0.13.13 ](https://github.com/sbt/sbt/releases/tag/v0.13.13).

## How was this patch tested?
Pass build and the existing tests.

Author: Weiqing Yang <yangweiqing001@gmail.com>

Closes #16069 from weiqingy/SPARK-18638.

## What changes were proposed in this pull request?
Change the way spark picks up version information. Also embed the build information to better identify the spark version running.

More context can be found here : https://github.com/apache/spark/pull/12152

## How was this patch tested?
Ran the mvn and sbt builds to verify the version information was being displayed correctly on executing <code>spark-submit --version </code>

![image](https://cloud.githubusercontent.com/assets/7732317/15197251/f7c673a2-1795-11e6-8b2f-88f2a70cf1c1.png)

Author: Dhruve Ashar <dhruveashar@gmail.com>

Closes #13061 from dhruve/impr/SPARK-14279.

This helps with preventing jdk8-specific calls being checked in,
because PR builders are running the compiler with the wrong settings.

If the JAVA_7_HOME env variable is set, assume it points at
a jdk7 and use its rt.jar when invoking javac. For zinc, just run
it with jdk7, and disable it when building jdk8-specific code.

A big note for sbt usage: adding the bootstrap options forces sbt
to fork the compiler, and that disables incremental compilation.
That means that it's really not convenient to use for normal
development, but should be ok for automated builds.

Tested with JAVA_HOME=jdk8 and JAVA_7_HOME=jdk7:
- mvn + zinc
- mvn sans zinc
- sbt

Verified that in all cases, jdk8-specific library calls fail to
compile.

Author: Marcelo Vanzin <vanzin@cloudera.com>

Closes #13272 from vanzin/SPARK-15451.

## What changes were proposed in this pull request?

Currently, `build/mvn` provides a convenient option, `--force`, in order to use the recommended version of maven without changing PATH environment variable. However, there were two problems.

- `dev/lint-java` does not use the newly installed maven.

  ```bash
$ ./build/mvn --force clean
$ ./dev/lint-java
Using `mvn` from path: /usr/local/bin/mvn
```
- It's not easy to type `--force` option always.

If '--force' option is used once, we had better prefer the installed maven recommended by Spark.
This PR makes `build/mvn` check the existence of maven installed by `--force` option first.

According to the comments, this PR aims to the followings:
- Detect the maven version from `pom.xml`.
- Install maven if there is no or old maven.
- Remove `--force` option.

## How was this patch tested?

Manual.

```bash
$ ./build/mvn --force clean
$ ./dev/lint-java
Using `mvn` from path: /Users/dongjoon/spark/build/apache-maven-3.3.9/bin/mvn
...
$ rm -rf ./build/apache-maven-3.3.9/
$ ./dev/lint-java
Using `mvn` from path: /usr/local/bin/mvn
```

Author: Dongjoon Hyun <dongjoon@apache.org>

Closes #12631 from dongjoon-hyun/SPARK-14867.

[archive.apache.org](https://archive.apache.org/) is undergoing maintenance, breaking our `build/mvn` script:

> We are in the process of relocating this service. To save on the immense bandwidth that this service outputs, we have put it in maintenance mode, disabling all downloads for the next few days. We expect the maintenance to be complete no later than the morning of Monday the 11th of April, 2016.

This patch fixes this issue by updating the script to use the regular mirror network to download Maven.

Author: Josh Rosen <joshrosen@databricks.com>

Closes #12262 from JoshRosen/fix-mvn-download.

## What changes were proposed in this pull request?

Allows to override locations for downloading Apache and Typesafe artifacts in build/mvn script.

## How was this patch tested?
By running script like
````
# Remove all previously downloaded artifacts
rm -rf build/apache-maven*
rm -rf build/zinc-*
rm -rf build/scala-*

# Make sure path is clean and doesn't contain mvn, for example.
...

# Run a command without setting anything and make sure it succeeds
build/mvn -Pyarn -Phadoop-2.4 -Dhadoop.version=2.6.0 package

# Run a command setting the default location as mirror and make sure it succeeds
APACHE_MIRROR=http://mirror.infra.cloudera.com/apache/ build/mvn -Pyarn -Phadoop-2.4 -Dhadoop.version=2.6.0 package

# Do the same without the trailing slash this time and make sure it succeeds
APACHE_MIRROR=http://mirror.infra.cloudera.com/apache build/mvn -Pyarn -Phadoop-2.4 -Dhadoop.version=2.6.0 package

# Do it with a bad URL and make sure it fails
APACHE_MIRROR=xyz build/mvn -Pyarn -Phadoop-2.4 -Dhadoop.version=2.6.0 package
````

Author: Mark Grover <mark@apache.org>

Closes #12250 from markgrover/spark-14477.

## What changes were proposed in this pull request?

`./build/mvn` file was downloading binaries in non HTTPS mode. This PR tends to fix it.

## How was this patch tested?

By running `./build/mvn clean package` locally

Author: Prajwal Tuladhar <praj@infynyxx.com>

Closes #12182 from infynyxx/mvn_use_https.

Phase 1: update plugin versions, test dependencies, some example and third-party versions

Author: Sean Owen <sowen@cloudera.com>

Closes #11206 from srowen/SPARK-13324.

We should update to the latest version of Zinc in order to match our SBT version.

Author: Josh Rosen <joshrosen@databricks.com>

Closes #10426 from JoshRosen/update-zinc.

…n script

Author: trystanleftwich <trystan@atscale.com>

Closes #9065 from trystanleftwich/SPARK-11052.

Currently if it isn't set it scans `/lib/*` and adds every dir to the
classpath which makes the env too large and every command called
afterwords fails.

Author: Kevin Cox <kevincox@kevincox.ca>

Closes #8994 from kevincox/kevincox-only-add-hive-to-classpath-if-var-is-set.

Remove 2 defunct SBT download URLs and replace with the 1 known download URL. Also, use https.
Follow up on https://github.com/apache/spark/pull/7792

Author: Sean Owen <sowen@cloudera.com>

Closes #7956 from srowen/SPARK-9633 and squashes the following commits:

caa40bd [Sean Owen] Remove 2 defunct SBT download URLs and replace with the 1 known download URL. Also, use https.

- pass `$ZINC_PORT` to zinc status/shutdown commands
- fix path check that sets `$ZINC_INSTALL_FLAG`, which was incorrectly
  causing zinc to be shutdown and restarted every time (with mismatched
  ports on those commands to boot)
- pass `-DzincPort=${ZINC_PORT}` to maven, to use the correct zinc port
  when building

Author: Ryan Williams <ryan.blake.williams@gmail.com>

Closes #7944 from ryan-williams/zinc-status and squashes the following commits:

619c520 [Ryan Williams] fix zinc status/shutdown commands

This allows build/mvn to be used by make-distribution.sh.

Author: Marcelo Vanzin <vanzin@cloudera.com>

Closes #7915 from vanzin/SPARK-9583 and squashes the following commits:

6469e60 [Marcelo Vanzin] [SPARK-9583] [build] Do not print mvn debug messages to stdout.

Target file(s) can be hosted on CDN nodes. HTTP/HTTPS redirection must be supported to download these files.

Author: Cheng Lian <lian@databricks.com>

Closes #7597 from liancheng/spark-9254 and squashes the following commits:

fd266ca [Cheng Lian] Uses `--fail' to make curl return non-zero value and remove garbage output when the download fails
a7cbfb3 [Cheng Lian] Supports HTTP/HTTPS redirection

added --force flag to manually download, if necessary, and use a built-in version of maven best for spark

Author: Brennon York <brennon.york@capitalone.com>

Closes #7374 from brennonyork/SPARK-8933 and squashes the following commits:

d673127 [Brennon York] added --force flag to manually download, if necessary, and use a built-in version of maven best for spark

Versions of Maven older than 3.3.0 apparently have [a bug in how they handle transitive dependencies](https://github.com/apache/spark/pull/6492#issuecomment-111001101).

I confirmed that upgrading to Maven 3.3.3 resolves at least the particular manifestation of this bug that I ran into.

Author: Nicholas Chammas <nicholas.chammas@gmail.com>

Closes #6770 from nchammas/maven-333 and squashes the following commits:

6bed2d9 [Nicholas Chammas] upgrade to Maven 3.3.3

I've seen out of memory exceptions when trying
to run many parallel builds against the same Zinc
server during packaging. We should use the same
increased memory settings we use for Maven itself.

I tested this and confirmed that the Nailgun JVM
launched with higher memory.

Author: Patrick Wendell <patrick@databricks.com>

Closes #4643 from pwendell/zinc-memory and squashes the following commits:

717cfb0 [Patrick Wendell] SPARK-5856: Launch Zinc with larger memory options.

For launching spark-shell from SBT.

Author: Liang-Chi Hsieh <viirya@gmail.com>

Closes #4451 from viirya/restore_stty and squashes the following commits:

fdfc480 [Liang-Chi Hsieh] Restore stty settings when exit (for launching spark-shell from SBT).

Author: GuoQiang Li <witgo@qq.com>

Closes #4263 from witgo/SPARK-5474 and squashes the following commits:

ef397ff [GuoQiang Li] review commits
a398324 [GuoQiang Li] curl should support URL redirection in build/mvn

When we use `make-distribution.sh` with `--with-tachyon` option, Tachyon will be downloaded by `wget` command but some systems don't have `wget` by default (MacOS X doesn't have).
Other scripts like build/mvn, build/sbt support not only `wget` but also `curl` so `make-distribution.sh` should support `curl` too.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #3988 from sarutak/SPARK-5188 and squashes the following commits:

0f546e0 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5188
010e884 [Kousuke Saruta] Merge branch 'SPARK-5188' of github.com:sarutak/spark into SPARK-5188
163687e [Kousuke Saruta] Fixed a merge conflict
e24e01b [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5188
3daf1f1 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5188
3caa4cb [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5188
7cc8255 [Kousuke Saruta] Fix to use \$MVN instead of mvn
a3e908b [Kousuke Saruta] Fixed style
2db9fbf [Kousuke Saruta] Removed redirection from the logic which checks the existence of commands
1e4c7e0 [Kousuke Saruta] Used "command" command instead of "type" command
83b49b5 [Kousuke Saruta] Modified make-distribution.sh so that we use curl, not only wget to get tachyon

build/mvn will automatically download tarball of maven. But currently, the URL is invalid.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #4124 from sarutak/SPARK-5339 and squashes the following commits:

6e96121 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5339
0e012d1 [Kousuke Saruta] Updated Maven version to 3.2.5
ca26499 [Kousuke Saruta] Fixed URL of the tarball of Maven

Recently, build/mvn and build/sbt are added, and sbt/sbt is changed but there are no license headers. Should we add license headers to the scripts right?
If it's not right, please let me correct.

This PR doesn't affect behavior of Spark, I don't file in JIRA.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #3817 from sarutak/add-license-header and squashes the following commits:

1abc972 [Kousuke Saruta] Added LICENSE Header

Creates a top level directory script (as `build/mvn`) to automatically download zinc and the specific version of scala used to easily build spark. This will also download and install maven if the user doesn't already have it and all packages are hosted under the `build/` directory. Tested on both Linux and OSX OS's and both work. All commands pass through to the maven binary so it acts exactly as a traditional maven call would.

Author: Brennon York <brennon.york@capitalone.com>

Closes #3707 from brennonyork/SPARK-4501 and squashes the following commits:

0e5a0e4 [Brennon York] minor incorrect doc verbage (with -> this)
9b79e38 [Brennon York] fixed merge conflicts with dev/run-tests, properly quoted args in sbt/sbt, fixed bug where relative paths would fail if passed in from build/mvn
d2d41b6 [Brennon York] added blurb about leverging zinc with build/mvn
b979c58 [Brennon York] updated the merge conflict
c5634de [Brennon York] updated documentation to overview build/mvn, updated all points where sbt/sbt was referenced with build/sbt
b8437ba [Brennon York] set progress bars for curl and wget when not run on jenkins, no progress bar when run on jenkins, moved sbt script to build/sbt, wrote stub and warning under sbt/sbt which calls build/sbt, modified build/sbt to use the correct directory, fixed bug in build/sbt-launch-lib.bash to correctly pull the sbt version
be11317 [Brennon York] added switch to silence download progress only if AMPLAB_JENKINS is set
28d0a99 [Brennon York] updated to remove the python dependency, uses grep instead
7e785a6 [Brennon York] added silent and quiet flags to curl and wget respectively, added single echo output to denote start of a download if download is needed
14a5da0 [Brennon York] removed unnecessary zinc output on startup
1af4a94 [Brennon York] fixed bug with uppercase vs lowercase variable
3e8b9b3 [Brennon York] updated to properly only restart zinc if it was freshly installed
a680d12 [Brennon York] Added comments to functions and tested various mvn calls
bb8cc9d [Brennon York] removed package files
ef017e6 [Brennon York] removed OS complexities, setup generic install_app call, removed extra file complexities, removed help, removed forced install (defaults now), removed double-dash from cli
07bf018 [Brennon York] Updated to specifically handle pulling down the correct scala version
f914dea [Brennon York] Beginning final portions of localized scala home
69c4e44 [Brennon York] working linux and osx installers for purely local mvn build
4a1609c [Brennon York] finalizing working linux install for maven to local ./build/apache-maven folder
cbfcc68 [Brennon York] Changed the default sbt/sbt to build/sbt and added a build/mvn which will automatically download, install, and execute maven with zinc for easier build capability