jira: https://issues.apache.org/jira/browse/SPARK-10249

update user guide since python support added.

Author: Yuhao Yang <hhbyyh@gmail.com>

Closes #8620 from hhbyyh/swPyDocExample.

Adds IndexToString to PySpark.

Author: Holden Karau <holden@pigscanfly.ca>

Closes #7976 from holdenk/SPARK-9654-add-string-indexer-inverse-in-pyspark.

Modified class-level docstrings to mark all feature transformers in pyspark.ml as experimental.

Author: noelsmith <mail@noelsmith.com>

Closes #8623 from noel-smith/SPARK-10094-mark-pyspark-ml-trans-exp.

cc mengxr

Author: Davies Liu <davies@databricks.com>

Closes #8657 from davies/move_since.

Add WeibullGenerator for RandomDataGenerator.
#8611 need use WeibullGenerator to generate random data based on Weibull distribution.

Author: Yanbo Liang <ybliang8@gmail.com>

Closes #8622 from yanboliang/spark-10464.

The goal of this PR is to have a weighted least squares implementation that takes the normal equation approach, and hence to be able to provide R-like summary statistics and support IRLS (used by GLMs). The tests match R's lm and glmnet.

There are couple TODOs that can be addressed in future PRs:
* consolidate summary statistics aggregators
* move `dspr` to `BLAS`
* etc

It would be nice to have this merged first because it blocks couple other features.

dbtsai

Author: Xiangrui Meng <meng@databricks.com>

Closes #8588 from mengxr/SPARK-9834.

[SPARK-10071] [STREAMING] Output a warning when writing QueueInputDStream and throw a better exception when reading QueueInputDStream

Output a warning when serializing QueueInputDStream rather than throwing an exception to allow unit tests use it. Moreover, this PR also throws an better exception when deserializing QueueInputDStream to make the user find out the problem easily. The previous exception is hard to understand: https://issues.apache.org/jira/browse/SPARK-8553

Author: zsxwing <zsxwing@gmail.com>

Closes #8624 from zsxwing/SPARK-10071 and squashes the following commits:

847cfa8 [zsxwing] Output a warning when writing QueueInputDStream and throw a better exception when reading QueueInputDStream

Author: Reynold Xin <rxin@databricks.com>

Closes #8660 from rxin/contrib.

Author: Michael Armbrust <michael@databricks.com>

Closes #8659 from marmbrus/testBuildBreak.

```scala
    import org.apache.spark.sql.hive.execution.HiveTableScan
    sql("select key, value, key + 1 from src").registerTempTable("abc")
    cacheTable("abc")

    val sparkPlan = sql(
      """select a.key, b.key, c.key from
        |abc a join abc b on a.key=b.key
        |join abc c on a.key=c.key""".stripMargin).queryExecution.sparkPlan

    assert(sparkPlan.collect { case e: InMemoryColumnarTableScan => e }.size === 3) // failed
    assert(sparkPlan.collect { case e: HiveTableScan => e }.size === 0) // failed
```

The actual plan is:

```
== Parsed Logical Plan ==
'Project [unresolvedalias('a.key),unresolvedalias('b.key),unresolvedalias('c.key)]
 'Join Inner, Some(('a.key = 'c.key))
  'Join Inner, Some(('a.key = 'b.key))
   'UnresolvedRelation [abc], Some(a)
   'UnresolvedRelation [abc], Some(b)
  'UnresolvedRelation [abc], Some(c)

== Analyzed Logical Plan ==
key: int, key: int, key: int
Project [key#14,key#61,key#66]
 Join Inner, Some((key#14 = key#66))
  Join Inner, Some((key#14 = key#61))
   Subquery a
    Subquery abc
     Project [key#14,value#15,(key#14 + 1) AS _c2#16]
      MetastoreRelation default, src, None
   Subquery b
    Subquery abc
     Project [key#61,value#62,(key#61 + 1) AS _c2#58]
      MetastoreRelation default, src, None
  Subquery c
   Subquery abc
    Project [key#66,value#67,(key#66 + 1) AS _c2#63]
     MetastoreRelation default, src, None

== Optimized Logical Plan ==
Project [key#14,key#61,key#66]
 Join Inner, Some((key#14 = key#66))
  Project [key#14,key#61]
   Join Inner, Some((key#14 = key#61))
    Project [key#14]
     InMemoryRelation [key#14,value#15,_c2#16], true, 10000, StorageLevel(true, true, false, true, 1), (Project [key#14,value#15,(key#14 + 1) AS _c2#16]), Some(abc)
    Project [key#61]
     MetastoreRelation default, src, None
  Project [key#66]
   MetastoreRelation default, src, None

== Physical Plan ==
TungstenProject [key#14,key#61,key#66]
 BroadcastHashJoin [key#14], [key#66], BuildRight
  TungstenProject [key#14,key#61]
   BroadcastHashJoin [key#14], [key#61], BuildRight
    ConvertToUnsafe
     InMemoryColumnarTableScan [key#14], (InMemoryRelation [key#14,value#15,_c2#16], true, 10000, StorageLevel(true, true, false, true, 1), (Project [key#14,value#15,(key#14 + 1) AS _c2#16]), Some(abc))
    ConvertToUnsafe
     HiveTableScan [key#61], (MetastoreRelation default, src, None)
  ConvertToUnsafe
   HiveTableScan [key#66], (MetastoreRelation default, src, None)
```

Author: Cheng Hao <hao.cheng@intel.com>

Closes #8494 from chenghao-intel/weird_cache.

[SPARK-10492] [STREAMING] [DOCUMENTATION] Update Streaming documentation about rate limiting and backpressure

Author: Tathagata Das <tathagata.das1565@gmail.com>

Closes #8656 from tdas/SPARK-10492 and squashes the following commits:

986cdd6 [Tathagata Das] Added information on backpressure

Loader.checkSchema was called to verify the schema after dataframe.select(...).
Schema verification should be done before dataframe.select(...)

Author: Vinod K C <vinod.kc@huawei.com>

Closes #8636 from vinodkc/fix_GaussianMixtureModel_load_verification.

https://issues.apache.org/jira/browse/SPARK-10441

Author: Yin Huai <yhuai@databricks.com>

Closes #8597 from yhuai/timestampJson.

Copied model must have the same parent, but ml.IsotonicRegressionModel.copy did not set parent.
Here fix it and add test case.

Author: Yanbo Liang <ybliang8@gmail.com>

Closes #8637 from yanboliang/spark-10470.

We did a lot of special handling for non-deterministic expressions in `Optimizer`. However, `PhysicalOperation` just collects all Projects and Filters and mess it up. We should respect the operators order caused by non-deterministic expressions in `PhysicalOperation`.

Author: Wenchen Fan <cloud0fan@outlook.com>

Closes #8486 from cloud-fan/fix.

This PR fix two model ```copy()``` related issues:
[SPARK-10480](https://issues.apache.org/jira/browse/SPARK-10480)
```ML.LinearRegressionModel.copy()``` ignored argument ```extra```, it will not take effect when users setting this parameter.
[SPARK-10479](https://issues.apache.org/jira/browse/SPARK-10479)
```ML.LogisticRegressionModel.copy()``` should copy model summary if available.

Author: Yanbo Liang <ybliang8@gmail.com>

Closes #8641 from yanboliang/linear-regression-copy.

JIRA: https://issues.apache.org/jira/browse/SPARK-9170

`StandardStructObjectInspector` will implicitly lowercase column names. But I think Orc format doesn't have such requirement. In fact, there is a `OrcStructInspector` specified for Orc format. We should use it when serialize rows to Orc file. It can be case preserving when writing ORC files.

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

Closes #7520 from viirya/use_orcstruct.

Author: Jacek Laskowski <jacek@japila.pl>

Closes #8629 from jaceklaskowski/docs-fixes.

… main README.

Author: Stephen Hopper <shopper@shopper-osx.local>

Closes #8646 from enragedginger/master.

We introduced the Netty network module for shuffle in Spark 1.2, and has turned it on by default for 3 releases. The old ConnectionManager is difficult to maintain. If we merge the patch now, by the time it is released, it would be 1 yr for which ConnectionManager is off by default. It's time to remove it.

Author: Reynold Xin <rxin@databricks.com>

Closes #8161 from rxin/SPARK-9767.

From Jira: We should use assertTrue, etc. instead to make sure the asserts are not ignored in tests.

Author: Holden Karau <holden@pigscanfly.ca>

Closes #8607 from holdenk/SPARK-10013-remove-java-assert-from-java-unit-tests.

To keep full compatibility of Parquet write path with Spark 1.4, we should rename the innermost field name of arrays that may contain null from "array_element" to "array".

Please refer to [SPARK-10434] [1] for more details.

[1]: https://issues.apache.org/jira/browse/SPARK-10434

Author: Cheng Lian <lian@databricks.com>

Closes #8586 from liancheng/spark-10434/fix-parquet-array-type.

- Fixed information around Python API tags in streaming programming guides
- Added missing stuff in python docs

Author: Tathagata Das <tathagata.das1565@gmail.com>

Closes #8595 from tdas/SPARK-10440.

Jenkins master builders are currently broken by a merge conflict between PR #8584 and PR #8155.

Author: Cheng Lian <lian@databricks.com>

Closes #8614 from liancheng/hotfix/fix-pr-8155-8584-conflict.

This PR fix the failed test and conflict for #8155

https://issues.apache.org/jira/browse/SPARK-9925

Closes #8155

Author: Yin Huai <yhuai@databricks.com>
Author: Davies Liu <davies@databricks.com>

Closes #8602 from davies/shuffle_partitions.

We should make sure the scaladoc for params includes their default values through the models in ml/

Author: Holden Karau <holden@pigscanfly.ca>

Closes #8591 from holdenk/SPARK-10402-add-scaladoc-for-default-values-of-params-in-ml.

[SPARK-10311] [STREAMING] Reload appId and attemptId when app starts with checkpoint file in cluster mode

Author: xutingjun <xutingjun@huawei.com>

Closes #8477 from XuTingjun/streaming-attempt.

Author: robbins <robbins@uk.ibm.com>

Closes #8605 from robbinspg/DAGSchedulerSuite-fix.

Support running pyspark with cluster mode on Mesos!
This doesn't upload any scripts, so if running in a remote Mesos requires the user to specify the script from a available URI.

Author: Timothy Chen <tnachen@gmail.com>

Closes #8349 from tnachen/mesos_python.

Author: Andrew Or <andrew@databricks.com>

Closes #8603 from andrewor14/minor-sql-changes.

This PR takes over https://github.com/apache/spark/pull/8389.

This PR improves `checkAnswer` to print the partially analyzed plan in addition to the user friendly error message, in order to aid debugging failing tests.

In doing so, I ran into a conflict with the various ways that we bring a SQLContext into the tests. Depending on the trait we refer to the current context as `sqlContext`, `_sqlContext`, `ctx` or `hiveContext` with access modifiers `public`, `protected` and `private` depending on the defining class.

I propose we refactor as follows:

1. All tests should only refer to a `protected sqlContext` when testing general features, and `protected hiveContext` when it is a method that only exists on a `HiveContext`.
2. All tests should only import `testImplicits._` (i.e., don't import `TestHive.implicits._`)

Author: Wenchen Fan <cloud0fan@outlook.com>

Closes #8584 from cloud-fan/cleanupTests.

This commit exists to close the following pull requests on Github:

Closes #1890 (requested by andrewor14, JoshRosen)
Closes #3558 (requested by JoshRosen, marmbrus)
Closes #3890 (requested by marmbrus)
Closes #3895 (requested by andrewor14, marmbrus)
Closes #4055 (requested by andrewor14)
Closes #4105 (requested by andrewor14)
Closes #4812 (requested by marmbrus)
Closes #5109 (requested by andrewor14)
Closes #5178 (requested by andrewor14)
Closes #5298 (requested by marmbrus)
Closes #5393 (requested by marmbrus)
Closes #5449 (requested by andrewor14)
Closes #5468 (requested by marmbrus)
Closes #5715 (requested by marmbrus)
Closes #6192 (requested by marmbrus)
Closes #6319 (requested by marmbrus)
Closes #6326 (requested by marmbrus)
Closes #6349 (requested by marmbrus)
Closes #6380 (requested by andrewor14)
Closes #6554 (requested by marmbrus)
Closes #6696 (requested by marmbrus)
Closes #6868 (requested by marmbrus)
Closes #6951 (requested by marmbrus)
Closes #7129 (requested by marmbrus)
Closes #7188 (requested by marmbrus)
Closes #7358 (requested by marmbrus)
Closes #7379 (requested by marmbrus)
Closes #7628 (requested by marmbrus)
Closes #7715 (requested by marmbrus)
Closes #7782 (requested by marmbrus)
Closes #7914 (requested by andrewor14)
Closes #8051 (requested by andrewor14)
Closes #8269 (requested by andrewor14)
Closes #8448 (requested by andrewor14)
Closes #8576 (requested by andrewor14)

`dev/lintr-r` passes on my machine now

Author: Shivaram Venkataraman <shivaram@cs.berkeley.edu>

Closes #8601 from shivaram/sparkr-style-fix.

Note: this is not intended to be in Spark 1.5!

This patch rewrites some code in the `DAGScheduler` to make it more readable. In particular
- there were blocks of code that are unnecessary and removed for simplicity
- there were abstractions that are unnecessary and made the code hard to navigate
- other minor changes

Author: Andrew Or <andrew@databricks.com>

Closes #8217 from andrewor14/dag-scheduler-readability and squashes the following commits:

57abca3 [Andrew Or] Move comment back into if case
574fb1e [Andrew Or] Merge branch 'master' of github.com:apache/spark into dag-scheduler-readability
64a9ed2 [Andrew Or] Remove unnecessary code + minor code rewrites

This avoids them being mistakenly pulled instead of the newer ones that
Spark actually uses. Spark only depends on these artifacts transitively,
so sometimes maven just decides to pick tachyon's version of the
dependency for whatever reason.

Author: Marcelo Vanzin <vanzin@cloudera.com>

Closes #8577 from vanzin/SPARK-10421.

It's not supported yet so we should error with a clear message.

Author: Andrew Or <andrew@databricks.com>

Closes #8590 from andrewor14/mesos-cluster-r-guard.

[SPARK-9591](https://issues.apache.org/jira/browse/SPARK-9591)
When we getting the broadcast variable, we can fetch the block form several location,but now when connecting the lost blockmanager(idle for enough time removed by driver when using dynamic resource allocate and so on) will cause task fail,and the worse case will cause the job fail.

Author: jeanlyn <jeanlyn92@gmail.com>

Closes #7927 from jeanlyn/catch_exception.

Author: Vinod K C <vinod.kc@huawei.com>

Closes #8581 from vinodkc/fix_RDDOperationScope_Hashcode.

This contribution is my original work and I license the work to the project under the project's open source license.

Author: Pat Shields <yeoldefortran@gmail.com>

Closes #7979 from pashields/env-loading-on-driver.

Author: robbins <robbins@uk.ibm.com>

Closes #8589 from robbinspg/InputStreamSuite-fix.