Repository: spark
Updated Branches:
  refs/heads/master 7ca7a6352 -> c528812ce


[SPARK-3359][BUILD][DOCS] Print examples and disable group and tparam tags in 
javadoc

## What changes were proposed in this pull request?

This PR proposes/fixes two things.

- Remove many errors to generate javadoc with Java8 from unrecognisable tags, 
`tparam` and `group`.

  ```
  [error] 
.../spark/mllib/target/java/org/apache/spark/ml/classification/Classifier.java:18:
 error: unknown tag: group
  [error]   /** group setParam */
  [error]       ^
  [error] 
.../spark/mllib/target/java/org/apache/spark/ml/classification/Classifier.java:8:
 error: unknown tag: tparam
  [error]  * tparam FeaturesType  Type of input features.  E.g., 
<code>Vector</code>
  [error]    ^
  ...
  ```

  It does not fully resolve the problem but remove many errors. It seems both 
`group` and `tparam` are unrecognisable in javadoc. It seems we can't print 
them pretty in javadoc in a way of `example` here because they appear 
differently (both examples can be found in 
http://spark.apache.org/docs/2.0.2/api/scala/index.html#org.apache.spark.ml.classification.Classifier).

- Print `example` in javadoc.
  Currently, there are few `example` tag in several places.

  ```
  ./graphx/src/main/scala/org/apache/spark/graphx/Graph.scala:   * example This 
operation might be used to evaluate a graph
  ./graphx/src/main/scala/org/apache/spark/graphx/Graph.scala:   * example We 
might use this operation to change the vertex values
  ./graphx/src/main/scala/org/apache/spark/graphx/Graph.scala:   * example This 
function might be used to initialize edge
  ./graphx/src/main/scala/org/apache/spark/graphx/Graph.scala:   * example This 
function might be used to initialize edge
  ./graphx/src/main/scala/org/apache/spark/graphx/Graph.scala:   * example This 
function might be used to initialize edge
  ./graphx/src/main/scala/org/apache/spark/graphx/Graph.scala:   * example We 
can use this function to compute the in-degree of each
  ./graphx/src/main/scala/org/apache/spark/graphx/Graph.scala:   * example This 
function is used to update the vertices with new values based on external data.
  ./graphx/src/main/scala/org/apache/spark/graphx/GraphLoader.scala:   * 
example Loads a file in the following format:
  ./graphx/src/main/scala/org/apache/spark/graphx/GraphOps.scala:   * example 
This function is used to update the vertices with new
  ./graphx/src/main/scala/org/apache/spark/graphx/GraphOps.scala:   * example 
This function can be used to filter the graph based on some property, without
  ./graphx/src/main/scala/org/apache/spark/graphx/Pregel.scala: * example We 
can use the Pregel abstraction to implement PageRank:
  ./graphx/src/main/scala/org/apache/spark/graphx/VertexRDD.scala: * example 
Construct a `VertexRDD` from a plain RDD:
  
./repl/scala-2.10/src/main/scala/org/apache/spark/repl/SparkCommandLine.scala: 
* example new SparkCommandLine(Nil).settings
  ./repl/scala-2.10/src/main/scala/org/apache/spark/repl/SparkIMain.scala:   * 
example addImports("org.apache.spark.SparkContext")
  
./sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/LiteralGenerator.scala:
 * example {{{
  ```

**Before**

  <img width="505" alt="2016-11-20 2 43 23" 
src="https://cloud.githubusercontent.com/assets/6477701/20457285/26f07e1c-aecb-11e6-9ae9-d9dee66845f4.png";>

**After**
  <img width="499" alt="2016-11-20 1 27 17" 
src="https://cloud.githubusercontent.com/assets/6477701/20457240/409124e4-aeca-11e6-9a91-0ba514148b52.png";>

## How was this patch tested?

Maunally tested by `jekyll build` with Java 7 and 8

```
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)
```

```
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
```

Note: this does not make sbt unidoc suceed with Java 8 yet but it reduces the 
number of errors with Java 8.

Author: hyukjinkwon <gurwls...@gmail.com>

Closes #15939 from HyukjinKwon/SPARK-3359-javadoc.


Project: http://git-wip-us.apache.org/repos/asf/spark/repo
Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/c528812c
Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/c528812c
Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/c528812c

Branch: refs/heads/master
Commit: c528812ce770fd8a6626e7f9d2f8ca9d1e84642b
Parents: 7ca7a63
Author: hyukjinkwon <gurwls...@gmail.com>
Authored: Sun Nov 20 09:52:03 2016 +0000
Committer: Sean Owen <so...@cloudera.com>
Committed: Sun Nov 20 09:52:03 2016 +0000

----------------------------------------------------------------------
 pom.xml                  | 13 +++++++++++++
 project/SparkBuild.scala |  5 ++++-
 2 files changed, 17 insertions(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/spark/blob/c528812c/pom.xml
----------------------------------------------------------------------
diff --git a/pom.xml b/pom.xml
index 024b285..7c0b0b5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2478,10 +2478,23 @@
               <additionalparam>-Xdoclint:all 
-Xdoclint:-missing</additionalparam>
               <tags>
                 <tag>
+                  <name>example</name>
+                  <placement>a</placement>
+                  <head>Example:</head>
+                </tag>
+                <tag>
                   <name>note</name>
                   <placement>a</placement>
                   <head>Note:</head>
                 </tag>
+                <tag>
+                  <name>group</name>
+                  <placement>X</placement>
+                </tag>
+                <tag>
+                  <name>tparam</name>
+                  <placement>X</placement>
+                </tag>
               </tags>
             </configuration>
           </plugin>

http://git-wip-us.apache.org/repos/asf/spark/blob/c528812c/project/SparkBuild.scala
----------------------------------------------------------------------
diff --git a/project/SparkBuild.scala b/project/SparkBuild.scala
index 92b4565..429a163 100644
--- a/project/SparkBuild.scala
+++ b/project/SparkBuild.scala
@@ -742,7 +742,10 @@ object Unidoc {
       "-windowtitle", "Spark " + version.value.replaceAll("-SNAPSHOT", "") + " 
JavaDoc",
       "-public",
       "-noqualifier", "java.lang",
-      "-tag", """note:a:Note\:"""
+      "-tag", """example:a:Example\:""",
+      "-tag", """note:a:Note\:""",
+      "-tag", "group:X",
+      "-tag", "tparam:X"
     ),
 
     // Use GitHub repository for Scaladoc source links


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