[SPARK-2875] [PySpark] [SQL] handle null in schemaRDD()

Handle null in schemaRDD during converting them into Python.

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

Closes #1802 from davies/json and squashes the following commits:

88e6b1f [Davies Liu] handle null in schemaRDD()

(cherry picked from commit 48789117c2dd6d38e0bd8d21cdbcb989913205a6)
Signed-off-by: Michael Armbrust <michael@databricks.com>
[SPARK-2678][Core][SQL] A workaround for SPARK-2678

JIRA issues:

- Main: [SPARK-2678](https://issues.apache.org/jira/browse/SPARK-2678)
- Related: [SPARK-2874](https://issues.apache.org/jira/browse/SPARK-2874)

Related PR:

- #1715

This PR is both a fix for SPARK-2874 and a workaround for SPARK-2678. Fixing SPARK-2678 completely requires some API level changes that need further discussion, and we decided not to include it in Spark 1.1 release. As currently SPARK-2678 only affects Spark SQL scripts, this workaround is enough for Spark 1.1. Command line option handling logic in bash scripts looks somewhat dirty and duplicated, but it helps to provide a cleaner user interface as well as retain full downward compatibility for now.

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

Closes #1801 from liancheng/spark-2874 and squashes the following commits:

8045d7a [Cheng Lian] Make sure test suites pass
8493a9e [Cheng Lian] Using eval to retain quoted arguments
aed523f [Cheng Lian] Fixed typo in bin/spark-sql
f12a0b1 [Cheng Lian] Worked arount SPARK-2678
daee105 [Cheng Lian] Fixed usage messages of all Spark SQL related scripts
(cherry picked from commit a6cd31108f0d73ce6823daafe8447677e03cfd13)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
[SPARK-2627] [PySpark] have the build enforce PEP 8 automatically

As described in [SPARK-2627](https://issues.apache.org/jira/browse/SPARK-2627), we'd like Python code to automatically be checked for PEP 8 compliance by Jenkins. This pull request aims to do that.

Notes:
* We may need to install [`pep8`](https://pypi.python.org/pypi/pep8) on the build server.
* I'm expecting tests to fail now that PEP 8 compliance is being checked as part of the build. I'm fine with cleaning up any remaining PEP 8 violations as part of this pull request.
* I did not understand why the RAT and scalastyle reports are saved to text files. I did the same for the PEP 8 check, but only so that the console output style can match those for the RAT and scalastyle checks. The PEP 8 report is removed right after the check is complete.
* Updates to the ["Contributing to Spark"](https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark) guide will be submitted elsewhere, as I don't believe that text is part of the Spark repo.

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

Closes #1744 from nchammas/master and squashes the following commits:

274b238 [Nicholas Chammas] [SPARK-2627] [PySpark] minor indentation changes
983d963 [nchammas] Merge pull request #5 from apache/master
1db5314 [nchammas] Merge pull request #4 from apache/master
0e0245f [Nicholas Chammas] [SPARK-2627] undo erroneous whitespace fixes
bf30942 [Nicholas Chammas] [SPARK-2627] PEP8: comment spacing
6db9a44 [nchammas] Merge pull request #3 from apache/master
7b4750e [Nicholas Chammas] merge upstream changes
91b7584 [Nicholas Chammas] [SPARK-2627] undo unnecessary line breaks
44e3e56 [Nicholas Chammas] [SPARK-2627] use tox.ini to exclude files
b09fae2 [Nicholas Chammas] don't wrap comments unnecessarily
bfb9f9f [Nicholas Chammas] [SPARK-2627] keep up with the PEP 8 fixes
9da347f [nchammas] Merge pull request #2 from apache/master
aa5b4b5 [Nicholas Chammas] [SPARK-2627] follow Spark bash style for if blocks
d0a83b9 [Nicholas Chammas] [SPARK-2627] check that pep8 downloaded fine
dffb5dd [Nicholas Chammas] [SPARK-2627] download pep8 at runtime
a1ce7ae [Nicholas Chammas] [SPARK-2627] space out test report sections
21da538 [Nicholas Chammas] [SPARK-2627] it's PEP 8, not PEP8
6f4900b [Nicholas Chammas] [SPARK-2627] more misc PEP 8 fixes
fe57ed0 [Nicholas Chammas] removing merge conflict backups
9c01d4c [nchammas] Merge pull request #1 from apache/master
9a66cb0 [Nicholas Chammas] resolving merge conflicts
a31ccc4 [Nicholas Chammas] [SPARK-2627] miscellaneous PEP 8 fixes
beaa9ac [Nicholas Chammas] [SPARK-2627] fail check on non-zero status
723ed39 [Nicholas Chammas] always delete the report file
0541ebb [Nicholas Chammas] [SPARK-2627] call Python linter from run-tests
12440fa [Nicholas Chammas] [SPARK-2627] add Scala linter
61c07b9 [Nicholas Chammas] [SPARK-2627] add Python linter
75ad552 [Nicholas Chammas] make check output style consistent

(cherry picked from commit d614967b0bad1e6c5277d612602ec0a653a00258)
Signed-off-by: Reynold Xin <rxin@apache.org>
SPARK-2566. Update ShuffleWriteMetrics incrementally

I haven't tested this out on a cluster yet, but wanted to make sure the approach (passing ShuffleWriteMetrics down to DiskBlockObjectWriter) was ok

Author: Sandy Ryza <sandy@cloudera.com>

Closes #1481 from sryza/sandy-spark-2566 and squashes the following commits:

8090d88 [Sandy Ryza] Fix ExternalSorter
b2a62ed [Sandy Ryza] Fix more test failures
8be6218 [Sandy Ryza] Fix test failures and mark a couple variables private
c5e68e5 [Sandy Ryza] SPARK-2566. Update ShuffleWriteMetrics incrementally
(cherry picked from commit 4e982364426c7d65032e8006c63ca4f9a0d40470)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
[SPARK-2852][MLLIB] API consistency for `mllib.feature`

This is part of SPARK-2828:

1. added a Java-friendly fit method to Word2Vec with tests
2. change DeveloperApi to Experimental for Normalizer & StandardScaler
3. change default feature dimension to 2^20 in HashingTF

Author: Xiangrui Meng <meng@databricks.com>

Closes #1807 from mengxr/feature-api-check and squashes the following commits:

773c1a9 [Xiangrui Meng] change default numFeatures to 2^20 in HashingTF change annotation from DeveloperApi to Experimental in Normalizer and StandardScaler
883e122 [Xiangrui Meng] add @Experimental to Word2VecModel add a Java-friendly method to Word2Vec.fit with tests

(cherry picked from commit 25cff1019da9d6cfc486a31d035b372ea5fbdfd2)
Signed-off-by: Xiangrui Meng <meng@databricks.com>
[PySpark] Add blanklines to Python docstrings so example code renders correctly

Author: RJ Nowling <rnowling@gmail.com>

Closes #1808 from rnowling/pyspark_docs and squashes the following commits:

c06d774 [RJ Nowling] Add blanklines to Python docstrings so example code renders correctly

(cherry picked from commit e537b33c63d3fb373fe41deaa607d72e76e3906b)
Signed-off-by: Xiangrui Meng <meng@databricks.com>
SPARK-2882: Spark build now checks local maven cache for dependencies

Fixes [SPARK-2882](https://issues.apache.org/jira/browse/SPARK-2882)

Author: Gregory Owen <greowen@gmail.com>

Closes #1818 from GregOwen/spark-2882 and squashes the following commits:

294446d [Gregory Owen] SPARK-2882: Spark build now checks local maven cache for dependencies
(cherry picked from commit 4e008334ee0fb60f9fe8820afa06f7b7f0fa7a6c)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
[SPARK-2583] ConnectionManager error reporting

This patch modifies the ConnectionManager so that error messages are sent in reply when uncaught exceptions occur during message processing.  This prevents message senders from hanging while waiting for an acknowledgment if the remote message processing failed.

This is an updated version of sarutak's PR, #1490.  The main change is to use Futures / Promises to signal errors.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>
Author: Josh Rosen <joshrosen@apache.org>

Closes #1758 from JoshRosen/connection-manager-fixes and squashes the following commits:

68620cb [Josh Rosen] Fix test in BlockFetcherIteratorSuite:
83673de [Josh Rosen] Error ACKs should trigger IOExceptions, so catch only those exceptions in the test.
b8bb4d4 [Josh Rosen] Fix manager.id vs managerServer.id typo that broke security tests.
659521f [Josh Rosen] Include previous exception when throwing new one
a2f745c [Josh Rosen] Remove sendMessageReliablySync; callers can wait themselves.
c01c450 [Josh Rosen] Return Try[Message] from sendMessageReliablySync.
f1cd1bb [Josh Rosen] Clean up @sarutak's PR #1490 for [SPARK-2583]: ConnectionManager error reporting
7399c6b [Josh Rosen] Merge remote-tracking branch 'origin/pr/1490' into connection-manager-fixes
ee91bb7 [Kousuke Saruta] Modified BufferMessage.scala to keep the spark code style
9dfd0d8 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-2583
e7d9aa6 [Kousuke Saruta] rebase to master
326a17f [Kousuke Saruta] Add test cases to ConnectionManagerSuite.scala for SPARK-2583
2a18d6b [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-2583
22d7ebd [Kousuke Saruta] Add test cases to BlockManagerSuite for SPARK-2583
e579302 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-2583
281589c [Kousuke Saruta] Add a test case to BlockFetcherIteratorSuite.scala for fetching block from remote from successfully
0654128 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-2583
ffaa83d [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-2583
12d3de8 [Kousuke Saruta] Added BlockFetcherIteratorSuite.scala
4117b8f [Kousuke Saruta] Modified ConnectionManager to be alble to handle error during processing message
717c9c3 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-2583
6635467 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-2583
e2b8c4a [Kousuke Saruta] Modify to propagete error using ConnectionManager
(cherry picked from commit 17caae48b3608552dd6e3ae652043831f932ce95)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
SPARK-2879 [BUILD] Use HTTPS to access Maven Central and other repos

Maven Central has just now enabled HTTPS access for everyone to Maven Central (http://central.sonatype.org/articles/2014/Aug/03/https-support-launching-now/) This is timely, as a reminder of how easily an attacker can slip malicious code into a build that's downloading artifacts over HTTP (http://blog.ontoillogical.com/blog/2014/07/28/how-to-take-over-any-java-developer/).

In the meantime, it looks like the Spring repo also now supports HTTPS, so can be used this way too.

I propose to use HTTPS to access these repos.

Author: Sean Owen <srowen@gmail.com>

Closes #1805 from srowen/SPARK-2879 and squashes the following commits:

7043a8e [Sean Owen] Use HTTPS for Maven Central libs and plugins; use id 'central' to override parent properly; use HTTPS for Spring repo
(cherry picked from commit 4201d2711cd20a2892c40eb11102f73c2f826b2e)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
HOTFIX: Support custom Java 7 location
Updating versions for Spark 1.1.0
[maven-release-plugin] prepare release v1.1.0-snapshot1
[maven-release-plugin] prepare for next development iteration
[SPARK-2887] fix bug of countApproxDistinct() when have more than one partition

fix bug of countApproxDistinct() when have more than one partition

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

Closes #1812 from davies/approx and squashes the following commits:

bf757ce [Davies Liu] fix bug of countApproxDistinct() when have more than one partition
(cherry picked from commit ffd1f59a62a9dd9a4d5a7b09490b9d01ff1cd42d)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
[SPARK-2851] [mllib] DecisionTree Python consistency update

Added 6 static train methods to match Python API, but without default arguments (but with Python default args noted in docs).

Added factory classes for Algo and Impurity, but made private[mllib].

CC: mengxr dorx  Please let me know if there are other changes which would help with API consistency---thanks!

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

Closes #1798 from jkbradley/dt-python-consistency and squashes the following commits:

6f7edf8 [Joseph K. Bradley] Merge remote-tracking branch 'upstream/master' into dt-python-consistency
a0d7dbe [Joseph K. Bradley] DecisionTree: In Java-friendly train* methods, changed to use JavaRDD instead of RDD.
ee1d236 [Joseph K. Bradley] DecisionTree API updates: * Removed train() function in Python API (tree.py) ** Removed corresponding function in Scala/Java API (the ones taking basic types)
00f820e [Joseph K. Bradley] Merge remote-tracking branch 'upstream/master' into dt-python-consistency
fe6dbfa [Joseph K. Bradley] removed unnecessary imports
e358661 [Joseph K. Bradley] DecisionTree API change: * Added 6 static train methods to match Python API, but without default arguments (but with Python default args noted in docs).
c699850 [Joseph K. Bradley] a few doc comments
eaf84c0 [Joseph K. Bradley] Added DecisionTree static train() methods API to match Python, but without default parameters

(cherry picked from commit 47ccd5e71be49b723476f3ff8d5768f0f45c2ea6)
Signed-off-by: Xiangrui Meng <meng@databricks.com>
SPARK-2879 part 2 [BUILD] Use HTTPS to access Maven Central and other repos

.. and use canonical repo1.maven.org Maven Central repo. (And make sure snapshots are disabled for plugins from Maven Central.)

Author: Sean Owen <srowen@gmail.com>

Closes #1828 from srowen/SPARK-2879.2 and squashes the following commits:

639f495 [Sean Owen] .. and use canonical repo1.maven.org Maven Central repo. (And make sure snapshots are disabled for plugins from Maven Central.)
(cherry picked from commit 75993a65173172da32bbe98751e8c0f55c17a52e)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
[mllib] DecisionTree Strategy parameter checks

Added some checks to Strategy to print out meaningful error messages when given invalid DecisionTree parameters.
CC mengxr

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

Closes #1821 from jkbradley/dt-robustness and squashes the following commits:

4dc449a [Joseph K. Bradley] Merge remote-tracking branch 'upstream/master' into dt-robustness
7a61f7b [Joseph K. Bradley] Added some checks to Strategy to print out meaningful error messages when given invalid DecisionTree parameters

(cherry picked from commit 8d1dec4fa4798bb48b8947446d306ec9ba6bddb5)
Signed-off-by: Xiangrui Meng <meng@databricks.com>