[SPARK-3747] TaskResultGetter could incorrectly abort a stage if it cannot get result for a specific task

Author: Reynold Xin <rxin@apache.org>

Closes #2599 from rxin/SPARK-3747 and squashes the following commits:

a74c04d [Reynold Xin] Added a line of comment explaining NonFatal
0e8d44c [Reynold Xin] [SPARK-3747] TaskResultGetter could incorrectly abort a stage if it cannot get result for a specific task
[SPARK-3751] [mllib] DecisionTree: example update + print options

DecisionTreeRunner functionality additions:
* Allow user to pass in a test dataset
* Do not print full model if the model is too large.

As part of this, modify DecisionTreeModel and RandomForestModel to allow printing less info.  Proposed updates:
* toString: prints model summary
* toDebugString: prints full model (named after RDD.toDebugString)

Similar update to Python API:
* __repr__() now prints a model summary
* toDebugString() now prints the full model

CC: mengxr  chouqin manishamde codedeft  Small update (whomever can take a look).  Thanks!

Author: Joseph K. Bradley <joseph.kurata.bradley@gmail.com>

Closes #2604 from jkbradley/dtrunner-update and squashes the following commits:

b2b3c60 [Joseph K. Bradley] re-added python sql doc test, temporarily removed before
07b1fae [Joseph K. Bradley] repr() now prints a model summary toDebugString() now prints the full model
1d0d93d [Joseph K. Bradley] Updated DT and RF to print less when toString is called. Added toDebugString for verbose printing.
22eac8c [Joseph K. Bradley] Merge remote-tracking branch 'upstream/master' into dtrunner-update
e007a95 [Joseph K. Bradley] Updated DecisionTreeRunner to accept a test dataset.
[SPARK-3748] Log thread name in unit test logs

Thread names are useful for correlating failures.

Author: Reynold Xin <rxin@apache.org>

Closes #2600 from rxin/log4j and squashes the following commits:

83ffe88 [Reynold Xin] [SPARK-3748] Log thread name in unit test logs
[SPARK-3757] mvn clean doesn't delete some files

Added directory to be deleted into maven-clean-plugin in pom.xml.

Author: Masayoshi TSUZUKI <tsudukim@oss.nttdata.co.jp>

Closes #2613 from tsudukim/feature/SPARK-3757 and squashes the following commits:

8804bfc [Masayoshi TSUZUKI] Modified indent.
67c7171 [Masayoshi TSUZUKI] [SPARK-3757] mvn clean doesn't delete some files
[SPARK-3749] [PySpark] fix bugs in broadcast large closure of RDD

1. broadcast is triggle unexpected
2. fd is leaked in JVM (also leak in parallelize())
3. broadcast is not unpersisted in JVM after RDD is not be used any more.

cc JoshRosen , sorry for these stupid bugs.

Author: Davies Liu <davies.liu@gmail.com>

Closes #2603 from davies/fix_broadcast and squashes the following commits:

080a743 [Davies Liu] fix bugs in broadcast large closure of RDD
SPARK-2626 [DOCS] Stop SparkContext in all examples

Call SparkContext.stop() in all examples (and touch up minor nearby code style issues while at it)

Author: Sean Owen <sowen@cloudera.com>

Closes #2575 from srowen/SPARK-2626 and squashes the following commits:

5b2baae [Sean Owen] Call SparkContext.stop() in all examples (and touch up minor nearby code style issues while at it)
[SPARK-3755][Core] Do not bind port 1 - 1024 to server in spark

Non-root user use port 1- 1024 to start jetty server will get the exception " java.net.SocketException: Permission denied", so not use these ports

Author: scwf <wangfei1@huawei.com>

Closes #2610 from scwf/1-1024 and squashes the following commits:

cb8cc76 [scwf] do not use port 1 - 1024
[SPARK-3756] [Core]check exception is caused by an address-port collision properly

Jetty server use MultiException to handle exceptions when start server
refer https://github.com/eclipse/jetty.project/blob/jetty-8.1.14.v20131031/jetty-server/src/main/java/org/eclipse/jetty/server/Server.java

So in ```isBindCollision``` add the logical to cover MultiException

Author: scwf <wangfei1@huawei.com>

Closes #2611 from scwf/fix-isBindCollision and squashes the following commits:

984cb12 [scwf] optimize the fix
3a6c849 [scwf] fix bug in isBindCollision
[SQL] Kill dangerous trailing space in query string

MD5 of query strings in `createQueryTest` calls are used to generate golden files, leaving trailing spaces there can be really dangerous. Got bitten by this while working on #2616: my "smart" IDE automatically removed a trailing space and makes Jenkins fail.

(Really should add "no trailing space" to our coding style guidelines!)

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

Closes #2619 from liancheng/kill-trailing-space and squashes the following commits:

034f119 [Cheng Lian] Kill dangerous trailing space in query string
Typo error in KafkaWordCount example

topicpMap to topicMap

Author: Gaspar Munoz <munozs.88@gmail.com>

Closes #2614 from gasparms/patch-1 and squashes the following commits:

00aab2c [Gaspar Munoz] Typo error in KafkaWordCount example
Python SQL Example Code

SQL example code for Python, as shown on [SQL Programming Guide](https://spark.apache.org/docs/1.0.2/sql-programming-guide.html)

Author: jyotiska <jyotiska123@gmail.com>

Closes #2521 from jyotiska/sql_example and squashes the following commits:

1471dcb [jyotiska] added imports for sql
b25e436 [jyotiska] pep 8 compliance
43fd10a [jyotiska] lines broken to maintain 80 char limit
b4fdf4e [jyotiska] removed blank lines
83d5ab7 [jyotiska] added inferschema and applyschema to the demo
306667e [jyotiska] replaced blank line with end line
c90502a [jyotiska] fixed new line
4939a70 [jyotiska] added new line at end for python style
0b46148 [jyotiska] fixed appname for python sql example
8f67b5b [jyotiska] added python sql example
[SPARK-3746][SQL] Lock hive client when creating tables

Author: Michael Armbrust <michael@databricks.com>

Closes #2598 from marmbrus/hiveClientLock and squashes the following commits:

ca89fe8 [Michael Armbrust] Lock hive client when creating tables
[SPARK-3658][SQL] Start thrift server as a daemon

https://issues.apache.org/jira/browse/SPARK-3658

And keep the `CLASS_NOT_FOUND_EXIT_STATUS` and exit message in `SparkSubmit.scala`.

Author: WangTaoTheTonic <barneystinson@aliyun.com>
Author: WangTao <barneystinson@aliyun.com>

Closes #2509 from WangTaoTheTonic/thriftserver and squashes the following commits:

5dcaab2 [WangTaoTheTonic] issue about coupling
8ad9f95 [WangTaoTheTonic] generalization
598e21e [WangTao] take thrift server as a daemon
Merge branch 'master' of https://github.com/apache/spark