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Posted to commits@spark.apache.org by sr...@apache.org on 2018/02/28 18:49:12 UTC

[06/51] [partial] spark-website git commit: Apache Spark 2.3.0 Release: Generated Docs

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+<div class="subTitle">org.apache.spark.api.java</div>
+<h2 title="Class JavaSparkStatusTracker" class="title">Class JavaSparkStatusTracker</h2>
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+<div class="contentContainer">
+<ul class="inheritance">
+<li>Object</li>
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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
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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>
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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#getJobIdsForGroup-java.lang.String-">getJobIdsForGroup</a></span>(String&nbsp;jobGroup)</code>
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+ <p>
+ The returned list may contain running, failed, and completed jobs, and may vary across
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+ its result.</div>
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+<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>
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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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+<div class="block">Returns job information, or <code>null</code> if the job 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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+<h2 title="Class JavaUtils.SerializableMapWrapper" class="title">Class JavaUtils.SerializableMapWrapper&lt;A,B&gt;</h2>
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+<li>Object</li>
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+<dd><a href="../../../../../org/apache/spark/api/java/JavaUtils.html" title="class in org.apache.spark.api.java">JavaUtils</a></dd>
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+<hr>
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+<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>
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+<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>
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+<title>Optional (Spark 2.3.0 JavaDoc)</title>
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+var tabs = {65535:["t0","All Methods"],1:["t1","Static Methods"],2:["t2","Instance Methods"],8:["t4","Concrete Methods"]};
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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 links">Skip navigation links</a></div>
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+</ul>
+</div>
+<div class="subNav">
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+<li><a href="../../../../../org/apache/spark/api/java/JavaUtils.SerializableMapWrapper.html" title="class in org.apache.spark.api.java"><span class="typeNameLink">Prev&nbsp;Class</span></a></li>
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+<ul class="subNavList">
+<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>
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+<!-- ======== 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>
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+</ul>
+<div class="description">
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+<dd><code>T</code> - type of value held inside</dd>
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+<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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+ <p>From <code>com.google.common.base.Optional</code> it implements:</p>
+
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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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+<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>
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+<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>
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+<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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+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/spark/api/java/Optional.html#isPresent--">isPresent</a></span>()</code>&nbsp;</td>
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+<tr id="i7" class="rowColor">
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+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/spark/api/java/Optional.html#of-T-">of</a></span>(T&nbsp;value)</code>&nbsp;</td>
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+<tr id="i8" class="altColor">
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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>
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+<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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+<li class="blockList">
+<h4>empty</h4>
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+<dl>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>an empty <code>Optional</code></dd>
+</dl>
+</li>
+</ul>
+<a name="of-java.lang.Object-">
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+</a><a name="of-T-">
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+<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>
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+</li>
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+<a name="ofNullable-java.lang.Object-">
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+<h4>ofNullable</h4>
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+<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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+<a name="get--">
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+<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>
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+</li>
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+<a name="orElse-java.lang.Object-">
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+<dd><code>other</code> - value to return if this is empty</dd>
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+</li>
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+<dl>
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+</dl>
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+</ul>
+<a name="fromNullable-java.lang.Object-">
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+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>value</code> - value to wrap, which may be null</dd>
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+</li>
+</ul>
+<a name="or-java.lang.Object-">
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+<li class="blockList">
+<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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