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+<h2 title="Class JavaSparkStatusTracker" class="title">Class 
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+<div class="contentContainer">
+<ul class="inheritance">
+<li>Object</li>
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+<pre>public class <span class="typeNameLabel">JavaSparkStatusTracker</span>
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+<div class="block">Low-level status reporting APIs for monitoring job and 
stage progress.
+ <p>
+ These APIs intentionally provide very weak consistency semantics; consumers 
of these APIs should
+ be prepared to handle empty / missing information.  For example, a job's 
stage ids may be known
+ but the status API may not have any information about the details of those 
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+ <code>getStageInfo</code> could potentially return <code>null</code> for a 
valid stage id.
+ <p>
+ To limit memory usage, these APIs only provide information on recent jobs / 
stages.  These APIs
+ will provide information for the last <code>spark.ui.retainedStages</code> 
stages and
+ <code>spark.ui.retainedJobs</code> jobs.
+ <p></div>
+<dl>
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+<td class="colFirst"><code>int[]</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/JavaSparkStatusTracker.html#getActiveJobIds--">getActiveJobIds</a></span>()</code>
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jobs.</div>
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+<td class="colFirst"><code>int[]</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/JavaSparkStatusTracker.html#getActiveStageIds--">getActiveStageIds</a></span>()</code>
+<div class="block">Returns an array containing the ids of all active 
stages.</div>
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+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code>int[]</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/JavaSparkStatusTracker.html#getJobIdsForGroup-java.lang.String-">getJobIdsForGroup</a></span>(String&nbsp;jobGroup)</code>
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group.</div>
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+<td class="colFirst"><code><a 
href="../../../../../org/apache/spark/SparkJobInfo.html" title="interface in 
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+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/JavaSparkStatusTracker.html#getJobInfo-int-">getJobInfo</a></span>(int&nbsp;jobId)</code>
+<div class="block">Returns job information, or <code>null</code> if the job 
info could not be found or was garbage collected.</div>
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+</tr>
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href="../../../../../org/apache/spark/api/java/JavaSparkStatusTracker.html#getStageInfo-int-">getStageInfo</a></span>(int&nbsp;stageId)</code>
+<div class="block">Returns stage information, or <code>null</code> if the 
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If <code>jobGroup</code> is <code>null</code>, then
+ returns all known jobs that are not associated with a job group.
+ <p>
+ The returned list may contain running, failed, and completed jobs, and may 
vary across
+ invocations of this method.  This method does not guarantee the order of the 
elements in
+ its result.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>jobGroup</code> - (undocumented)</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
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+ This method does not guarantee the order of the elements in its result.</div>
+<dl>
+<dt><span class="returnLabel">Returns:</span></dt>
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+ This method does not guarantee the order of the elements in its result.</div>
+<dl>
+<dt><span class="returnLabel">Returns:</span></dt>
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info could not be found or was garbage collected.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>jobId</code> - (undocumented)</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
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+ garbage collected.</div>
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+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>stageId</code> - (undocumented)</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
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http://git-wip-us.apache.org/repos/asf/spark-website/blob/26c57a24/site/docs/2.3.0/api/java/org/apache/spark/api/java/JavaUtils.SerializableMapWrapper.html
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+<div class="subTitle">org.apache.spark.api.java</div>
+<h2 title="Class JavaUtils.SerializableMapWrapper" class="title">Class 
JavaUtils.SerializableMapWrapper&lt;A,B&gt;</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>Object</li>
+<li>
+<ul class="inheritance">
+<li>java.util.AbstractMap&lt;A,B&gt;</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.spark.api.java.JavaUtils.SerializableMapWrapper&lt;A,B&gt;</li>
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+<dl>
+<dt>Enclosing class:</dt>
+<dd><a href="../../../../../org/apache/spark/api/java/JavaUtils.html" 
title="class in org.apache.spark.api.java">JavaUtils</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public static class <span 
class="typeNameLabel">JavaUtils.SerializableMapWrapper&lt;A,B&gt;</span>
+extends java.util.AbstractMap&lt;A,B&gt;
+implements java.io.Serializable</pre>
+<dl>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a 
href="../../../../../serialized-form.html#org.apache.spark.api.java.JavaUtils.SerializableMapWrapper">Serialized
 Form</a></dd>
+</dl>
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org.apache.spark.api.java">JavaUtils.SerializableMapWrapper</a>&lt;A,B&gt;&nbsp;mapAsSerializableJavaMap(scala.collection.Map&lt;A,B&gt;&nbsp;underlying)</pre>
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+var rowColor = "rowColor";
+var tableTab = "tableTab";
+var activeTableTab = "activeTableTab";
+</script>
+<noscript>
+<div>JavaScript is disabled on your browser.</div>
+</noscript>
+<!-- ========= START OF TOP NAVBAR ======= -->
+<div class="topNav"><a name="navbar.top">
+<!--   -->
+</a>
+<div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation 
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+</div>
+<div class="subNav">
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+<li>Summary:&nbsp;</li>
+<li>Nested&nbsp;|&nbsp;</li>
+<li>Field&nbsp;|&nbsp;</li>
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+<li><a href="#method.summary">Method</a></li>
+</ul>
+<ul class="subNavList">
+<li>Detail:&nbsp;</li>
+<li>Field&nbsp;|&nbsp;</li>
+<li>Constr&nbsp;|&nbsp;</li>
+<li><a href="#method.detail">Method</a></li>
+</ul>
+</div>
+<a name="skip.navbar.top">
+<!--   -->
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+<!-- ========= END OF TOP NAVBAR ========= -->
+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.spark.api.java</div>
+<h2 title="Class Optional" class="title">Class Optional&lt;T&gt;</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>Object</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.spark.api.java.Optional&lt;T&gt;</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt><span class="paramLabel">Type Parameters:</span></dt>
+<dd><code>T</code> - type of value held inside</dd>
+</dl>
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd>java.io.Serializable</dd>
+</dl>
+<hr>
+<br>
+<pre>public final class <span class="typeNameLabel">Optional&lt;T&gt;</span>
+extends Object
+implements java.io.Serializable</pre>
+<div class="block"><p>Like <code>java.util.Optional</code> in Java 8, 
<code>scala.Option</code> in Scala, and
+ <code>com.google.common.base.Optional</code> in Google Guava, this class 
represents a
+ value of a given type that may or may not exist. It is used in methods that 
wish
+ to optionally return a value, in preference to returning 
<code>null</code>.</p>
+
+ <p>In fact, the class here is a reimplementation of the essential API of both
+ <code>java.util.Optional</code> and 
<code>com.google.common.base.Optional</code>. From
+ <code>java.util.Optional</code>, it implements:</p>
+
+ <ul>
+   <li><a 
href="../../../../../org/apache/spark/api/java/Optional.html#empty--"><code>empty()</code></a></li>
+   <li><a 
href="../../../../../org/apache/spark/api/java/Optional.html#of-T-"><code>of(Object)</code></a></li>
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+   <li><a 
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+   <li><a 
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+   <li><a 
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+ <p>From <code>com.google.common.base.Optional</code> it implements:</p>
+
+ <ul>
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+ <p><code>java.util.Optional</code> itself was not used because at the time, 
the
+ project did not require Java 8. Using 
<code>com.google.common.base.Optional</code>
+ has in the past caused serious library version conflicts with Guava that can't
+ be resolved by shading. Hence this work-alike clone.</p></div>
+<dl>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a 
href="../../../../../serialized-form.html#org.apache.spark.api.java.Optional">Serialized
 Form</a></dd>
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summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span 
class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a 
href="javascript:show(1);">Static Methods</a></span><span 
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href="javascript:show(8);">Concrete Methods</a></span><span 
class="tabEnd">&nbsp;</span></span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="class in 
org.apache.spark.api.java">Optional</a>&lt;T&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/Optional.html#absent--">absent</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="class in 
org.apache.spark.api.java">Optional</a>&lt;T&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/Optional.html#empty--">empty</a></span>()</code>&nbsp;</td>
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+<tr id="i2" class="altColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/Optional.html#equals-java.lang.Object-">equals</a></span>(Object&nbsp;obj)</code>&nbsp;</td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="class in 
org.apache.spark.api.java">Optional</a>&lt;T&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/Optional.html#fromNullable-T-">fromNullable</a></span>(T&nbsp;value)</code>&nbsp;</td>
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parameter in Optional">T</a></code></td>
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href="../../../../../org/apache/spark/api/java/Optional.html#get--">get</a></span>()</code>&nbsp;</td>
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href="../../../../../org/apache/spark/api/java/Optional.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
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+<tr id="i6" class="altColor">
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+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/Optional.html#isPresent--">isPresent</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i7" class="rowColor">
+<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="class in 
org.apache.spark.api.java">Optional</a>&lt;T&gt;</code></td>
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href="../../../../../org/apache/spark/api/java/Optional.html#of-T-">of</a></span>(T&nbsp;value)</code>&nbsp;</td>
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+<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="class in 
org.apache.spark.api.java">Optional</a>&lt;T&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/Optional.html#ofNullable-T-">ofNullable</a></span>(T&nbsp;value)</code>&nbsp;</td>
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+<tr id="i9" class="rowColor">
+<td class="colFirst"><code><a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="type 
parameter in Optional">T</a></code></td>
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href="../../../../../org/apache/spark/api/java/Optional.html#or-T-">or</a></span>(<a
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parameter in Optional">T</a>&nbsp;other)</code>&nbsp;</td>
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+<tr id="i10" class="altColor">
+<td class="colFirst"><code><a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="type 
parameter in Optional">T</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/Optional.html#orElse-T-">orElse</a></span>(<a
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parameter in Optional">T</a>&nbsp;other)</code>&nbsp;</td>
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+<tr id="i11" class="rowColor">
+<td class="colFirst"><code><a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="type 
parameter in Optional">T</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/Optional.html#orNull--">orNull</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i12" class="altColor">
+<td class="colFirst"><code>String</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/spark/api/java/Optional.html#toString--">toString</a></span>()</code>&nbsp;</td>
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+<!--   -->
+</a>
+<h3>Methods inherited from class&nbsp;Object</h3>
+<code>getClass, notify, notifyAll, wait, wait, wait</code></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
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+<ul class="blockList">
+<li class="blockList">
+<!-- ============ METHOD DETAIL ========== -->
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+<li class="blockList"><a name="method.detail">
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+<h3>Method Detail</h3>
+<a name="empty--">
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+<ul class="blockList">
+<li class="blockList">
+<h4>empty</h4>
+<pre>public static&nbsp;&lt;T&gt;&nbsp;<a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="class in 
org.apache.spark.api.java">Optional</a>&lt;T&gt;&nbsp;empty()</pre>
+<dl>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>an empty <code>Optional</code></dd>
+</dl>
+</li>
+</ul>
+<a name="of-java.lang.Object-">
+<!--   -->
+</a><a name="of-T-">
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+<pre>public static&nbsp;&lt;T&gt;&nbsp;<a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="class in 
org.apache.spark.api.java">Optional</a>&lt;T&gt;&nbsp;of(T&nbsp;value)</pre>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>value</code> - non-null value to wrap</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd><code>Optional</code> wrapping this value</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code>NullPointerException</code> - if value is null</dd>
+</dl>
+</li>
+</ul>
+<a name="ofNullable-java.lang.Object-">
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+<pre>public static&nbsp;&lt;T&gt;&nbsp;<a 
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org.apache.spark.api.java">Optional</a>&lt;T&gt;&nbsp;ofNullable(T&nbsp;value)</pre>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>value</code> - value to wrap, which may be null</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd><code>Optional</code> wrapping this value, which may be empty</dd>
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+</li>
+</ul>
+<a name="get--">
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+<pre>public&nbsp;<a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="type 
parameter in Optional">T</a>&nbsp;get()</pre>
+<dl>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>the value wrapped by this <code>Optional</code></dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code>NullPointerException</code> - if this is empty (contains no 
value)</dd>
+</dl>
+</li>
+</ul>
+<a name="orElse-java.lang.Object-">
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+</a><a name="orElse-T-">
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+<h4>orElse</h4>
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parameter in Optional">T</a>&nbsp;orElse(<a 
href="../../../../../org/apache/spark/api/java/Optional.html" title="type 
parameter in Optional">T</a>&nbsp;other)</pre>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>other</code> - value to return if this is empty</dd>
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+</ul>
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+</dl>
+</li>
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+<pre>public static final&nbsp;<a 
href="../../../../../org/apache/spark/storage/StorageLevel.html" title="class 
in org.apache.spark.storage">StorageLevel</a> MEMORY_AND_DISK_SER</pre>
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+<h4>MEMORY_AND_DISK_SER_2</h4>
+<pre>public static final&nbsp;<a 
href="../../../../../org/apache/spark/storage/StorageLevel.html" title="class 
in org.apache.spark.storage">StorageLevel</a> MEMORY_AND_DISK_SER_2</pre>
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+<pre>public static final&nbsp;<a 
href="../../../../../org/apache/spark/storage/StorageLevel.html" title="class 
in org.apache.spark.storage">StorageLevel</a> OFF_HEAP</pre>
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+<a name="StorageLevels--">
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+<li class="blockList">
+<h4>StorageLevels</h4>
+<pre>public&nbsp;StorageLevels()</pre>
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+<h4>create</h4>
+<pre>public static&nbsp;<a 
href="../../../../../org/apache/spark/storage/StorageLevel.html" title="class 
in org.apache.spark.storage">StorageLevel</a>&nbsp;create(boolean&nbsp;useDisk,
+                                  boolean&nbsp;useMemory,
+                                  boolean&nbsp;useOffHeap,
+                                  boolean&nbsp;deserialized,
+                                  int&nbsp;replication)</pre>
+<div class="block">Create a new StorageLevel object.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>useDisk</code> - saved to disk, if true</dd>
+<dd><code>useMemory</code> - saved to on-heap memory, if true</dd>
+<dd><code>useOffHeap</code> - saved to off-heap memory, if true</dd>
+<dd><code>deserialized</code> - saved as deserialized objects, if true</dd>
+<dd><code>replication</code> - replication factor</dd>
+</dl>
+</li>
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