[SPARK-3597][Mesos] Implement `killTask`.

The MesosSchedulerBackend did not previously implement `killTask`,
resulting in an exception.

Author: Brenden Matthews <brenden@diddyinc.com>

Closes #2453 from brndnmtthws/implement-killtask and squashes the following commits:

23ddcdc [Brenden Matthews] [SPARK-3597][Mesos] Implement `killTask`.
SPARK-1656: Fix potential resource leaks

JIRA: https://issues.apache.org/jira/browse/SPARK-1656

Author: zsxwing <zsxwing@gmail.com>

Closes #577 from zsxwing/SPARK-1656 and squashes the following commits:

c431095 [zsxwing] Add a comment and fix the code style
2de96e5 [zsxwing] Make sure file will be deleted if exception happens
28b90dc [zsxwing] Update to follow the code style
4521d6e [zsxwing] Merge branch 'master' into SPARK-1656
afc3383 [zsxwing] Update to follow the code style
071fdd1 [zsxwing] SPARK-1656: Fix potential resource leaks
[SPARK-3007][SQL] Fixes dynamic partitioning support for lower Hadoop versions

This is a follow up of #2226 and #2616 to fix Jenkins master SBT build failures for lower Hadoop versions (1.0.x and 2.0.x).

The root cause is the semantics difference of `FileSystem.globStatus()` between different versions of Hadoop, as illustrated by the following test code:

```scala
object GlobExperiments extends App {
  val conf = new Configuration()
  val fs = FileSystem.getLocal(conf)
  fs.globStatus(new Path("/tmp/wh/*/*/*")).foreach { status =>
    println(status.getPath)
  }
}
```

Target directory structure:

```
/tmp/wh
├── dir0
│   ├── dir1
│   │   └── level2
│   └── level1
└── level0
```

Hadoop 2.4.1 result:

```
file:/tmp/wh/dir0/dir1/level2
```

Hadoop 1.0.4 resuet:

```
file:/tmp/wh/dir0/dir1/level2
file:/tmp/wh/dir0/level1
file:/tmp/wh/level0
```

In #2226 and #2616, we call `FileOutputCommitter.commitJob()` at the end of the job, and the `_SUCCESS` mark file is written. When working with lower Hadoop versions, due to the `globStatus()` semantics issue, `_SUCCESS` is included as a separate partition data file by `Hive.loadDynamicPartitions()`, and fails partition spec checking.  The fix introduced in this PR is kind of a hack: when inserting data with dynamic partitioning, we intentionally avoid writing the `_SUCCESS` marker to workaround this issue.

Hive doesn't suffer this issue because `FileSinkOperator` doesn't call `FileOutputCommitter.commitJob()`, instead, it calls `Utilities.mvFileToFinalPath()` to cleanup the output directory and then loads it into Hive warehouse by with `loadDynamicPartitions()`/`loadPartition()`/`loadTable()`. This approach is better because it handles failed job and speculative tasks properly. We should add this step to `InsertIntoHiveTable` in another PR.

Author: Cheng Lian <lian.cs.zju@gmail.com>

Closes #2663 from liancheng/dp-hadoop-1-fix and squashes the following commits:

0177dae [Cheng Lian] Fixes dynamic partitioning support for lower Hadoop versions
HOTFIX: Fix unicode error in merge script.

The merge script builds up a big command array and sometimes
this contains both unicode and ascii strings. This doesn't work
if you try to join them into a single string. Longer term a solution
is to go and make sure the source of all strings is unicode.

This patch provides a simpler solution... just print the array
rather than joining. I actually prefer printing an array here
anyways since joining on spaces is lossy in the case of arguments
that themselves contain spaces.

Author: Patrick Wendell <pwendell@gmail.com>

Closes #2645 from pwendell/merge-script and squashes the following commits:

167b792 [Patrick Wendell] HOTFIX: Fix unicode error in merge script.
[Minor] Trivial fix to make codes more readable

It should just use `maxResults` there.

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

Closes #2654 from viirya/trivial_fix and squashes the following commits:

1362289 [Liang-Chi Hsieh] Trivial fix to make codes more readable.
[SPARK-3792][SQL] Enable JavaHiveQLSuite

Do not use TestSQLContext in JavaHiveQLSuite, that may lead to two SparkContexts in one jvm and enable JavaHiveQLSuite

Author: scwf <wangfei1@huawei.com>

Closes #2652 from scwf/fix-JavaHiveQLSuite and squashes the following commits:

be35c91 [scwf] enable JavaHiveQLSuite
[SPARK-3645][SQL] Makes table caching eager by default and adds syntax for lazy caching

Although lazy caching for in-memory table seems consistent with the `RDD.cache()` API, it's relatively confusing for users who mainly work with SQL and not familiar with Spark internals. The `CACHE TABLE t; SELECT COUNT(*) FROM t;` pattern is also commonly seen just to ensure predictable performance.

This PR makes both the `CACHE TABLE t [AS SELECT ...]` statement and the `SQLContext.cacheTable()` API eager by default, and adds a new `CACHE LAZY TABLE t [AS SELECT ...]` syntax to provide lazy in-memory table caching.

Also, took the chance to make some refactoring: `CacheCommand` and `CacheTableAsSelectCommand` are now merged and renamed to `CacheTableCommand` since the former is strictly a special case of the latter. A new `UncacheTableCommand` is added for the `UNCACHE TABLE t` statement.

Author: Cheng Lian <lian.cs.zju@gmail.com>

Closes #2513 from liancheng/eager-caching and squashes the following commits:

fe92287 [Cheng Lian] Makes table caching eager by default and adds syntax for lazy caching
[SPARK-3776][SQL] Wrong conversion to Catalyst for Option[Product]

Author: Renat Yusupov <re.yusupov@2gis.ru>

Closes #2641 from r3natko/feature/catalyst_option and squashes the following commits:

55d0c06 [Renat Yusupov] [SQL] SPARK-3776: Wrong conversion to Catalyst for Option[Product]
SPARK-3794 [CORE] Building spark core fails due to inadvertent dependency on Commons IO

Remove references to Commons IO FileUtils and replace with pure Java version, which doesn't need to traverse the whole directory tree first.

I think this method could be refined further if it would be alright to rename it and its args and break it down into two methods. I'm starting with a simple recursive rendition.

Author: Sean Owen <sowen@cloudera.com>

Closes #2662 from srowen/SPARK-3794 and squashes the following commits:

4cd172f [Sean Owen] Remove references to Commons IO FileUtils and replace with pure Java version, which doesn't need to traverse the whole directory tree first
Rectify gereneric parameter names between SparkContext and AccumulablePa...

AccumulableParam gave its generic parameters as 'R, T', whereas SparkContext labeled them 'T, R'.

Trivial, but really confusing.

I resolved this in favor of AccumulableParam, because it seemed to have some logic for its names.  I also extended this minimal, but at least present, justification into the SparkContext comments.

Author: Nathan Kronenfeld <nkronenfeld@oculusinfo.com>

Closes #2637 from nkronenfeld/accumulators and squashes the following commits:

98d6b74 [Nathan Kronenfeld] Rectify gereneric parameter names between SparkContext and AccumulableParam
[SPARK-3765][Doc] Add test information to sbt build docs

Add testing with sbt to doc ```building-spark.md```

Author: scwf <wangfei1@huawei.com>

Closes #2629 from scwf/sbt-doc and squashes the following commits:

fd9cf29 [scwf] add testing with sbt to docs
Merge branch 'master' of git://git.apache.org/spark into fix-assembly-jarname