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Posted to commits@beam.apache.org by jb...@apache.org on 2017/01/04 09:57:25 UTC
[37/52] [partial] beam-site git commit: Add 0.4.0 release
http://git-wip-us.apache.org/repos/asf/beam-site/blob/0c7c6b2a/src/documentation/sdks/javadoc/0.4.0/org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly.html
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+<h2 title="Class GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly" class="title">Class GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly<K,V></h2>
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+<div class="block">Runner-specific primitive that groups by key only, ignoring any window assignments. A
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+ single-output <code>PTransform</code> when applied to the given input.
+
+ <p>By default, always throws.</div>
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+<div class="header">
+<div class="subTitle">org.apache.beam.runners.core</div>
+<h2 title="Class GroupByKeyViaGroupByKeyOnly" class="title">Class GroupByKeyViaGroupByKeyOnly<K,V></h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
+<li>
+<ul class="inheritance">
+<li><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">org.apache.beam.sdk.transforms.PTransform</a><<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><K,V>>,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><K,<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><V>>>></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.beam.runners.core.GroupByKeyViaGroupByKeyOnly<K,V></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public class <span class="typeNameLabel">GroupByKeyViaGroupByKeyOnly<K,V></span>
+extends <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a><<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><K,V>>,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><K,<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><V>>>></pre>
+<div class="block">An implementation of <a href="../../../../../org/apache/beam/sdk/transforms/GroupByKey.html" title="class in org.apache.beam.sdk.transforms"><code>GroupByKey</code></a> built on top of a lower-level <a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly.html" title="class in org.apache.beam.runners.core"><code>GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly</code></a>
+ primitive.
+
+ <p>This implementation of <a href="../../../../../org/apache/beam/sdk/transforms/GroupByKey.html" title="class in org.apache.beam.sdk.transforms"><code>GroupByKey</code></a> proceeds via the following steps:
+ <ol>
+ <li><code>ReifyTimestampsAndWindowsDoFn ParDo(ReifyTimestampsAndWindows)</code>: This embeds
+ the previously-implicit timestamp and window into the elements themselves, so a
+ window-and-timestamp-unaware transform can operate on them.</li>
+ <li><code>GroupByKeyOnly</code>: This lower-level primitive groups by keys, ignoring windows
+ and timestamps. Many window-unaware runners have such a primitive already.</li>
+ <li><code>SortValuesByTimestamp ParDo(SortValuesByTimestamp)</code>: The values in the iterables
+ output by <a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly.html" title="class in org.apache.beam.runners.core"><code>GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly</code></a> are sorted by timestamp.</li>
+ <li><code>GroupAlsoByWindow</code>: This primitive processes the sorted values. Today it is
+ implemented as a <a href="../../../../../org/apache/beam/sdk/transforms/ParDo.html" title="class in org.apache.beam.sdk.transforms"><code>ParDo</code></a> that calls reserved internal methods.</li>
+ </ol>
+
+ <p>This implementation of <a href="../../../../../org/apache/beam/sdk/transforms/GroupByKey.html" title="class in org.apache.beam.sdk.transforms"><code>GroupByKey</code></a> has severe limitations unless its component
+ transforms are replaced. As-is, it is only applicable for in-memory runners using a batch-style
+ execution strategy. Specifically:
+
+ <ul>
+ <li>Every iterable output by <a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly.html" title="class in org.apache.beam.runners.core"><code>GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly</code></a> must contain all elements for that key.
+ A streaming-style partition, with multiple elements for the same key, will not yield
+ correct results.</li>
+ <li>Sorting of values by timestamp is performed on an in-memory list. It will not succeed
+ for large iterables.</li>
+ <li>The implementation of <code>GroupAlsoByWindow</code> does not support timers. This is only
+ appropriate for runners which also do not support timers.</li>
+ </ul></div>
+<dl>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../../serialized-form.html#org.apache.beam.runners.core.GroupByKeyViaGroupByKeyOnly">Serialized Form</a></dd>
+</dl>
+</li>
+</ul>
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+<li class="blockList">
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+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Nested Class Summary table, listing nested classes, and an explanation">
+<caption><span>Nested Classes</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Class and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static class </code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupAlsoByWindow.html" title="class in org.apache.beam.runners.core">GroupByKeyViaGroupByKeyOnly.GroupAlsoByWindow</a><<a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupAlsoByWindow.html" title="type parameter in GroupByKeyViaGroupByKeyOnly.GroupAlsoByWindow">K</a>,<a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupAlsoByWindow.html" title="type parameter in GroupByKeyViaGroupByKeyOnly.GroupAlsoByWindow">V</a>></span></code>
+<div class="block">Runner-specific primitive that takes a collection of timestamp-ordered values associated with
+ each key, groups the values by window, merges windows as needed, and for each window in each
+ key, outputs a collection of key/value-list pairs implicitly assigned to the window and with
+ the timestamp derived from that window.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static class </code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly.html" title="class in org.apache.beam.runners.core">GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly</a><<a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly.html" title="type parameter in GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly">K</a>,<a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly.html" title="type parameter in GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly">V</a>></span></code>
+<div class="block">Runner-specific primitive that groups by key only, ignoring any window assignments.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
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+<ul class="blockList">
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+<h3>Fields inherited from class org.apache.beam.sdk.transforms.<a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a></h3>
+<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#name">name</a></code></li>
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+<h3>Constructor Summary</h3>
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+<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html#GroupByKeyViaGroupByKeyOnly-org.apache.beam.sdk.transforms.GroupByKey-">GroupByKeyViaGroupByKeyOnly</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/GroupByKey.html" title="class in org.apache.beam.sdk.transforms">GroupByKey</a><<a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html" title="type parameter in GroupByKeyViaGroupByKeyOnly">K</a>,<a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html" title="type parameter in GroupByKeyViaGroupByKeyOnly">V</a>> originalTransform)</code> </td>
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+<h3>Method Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </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><a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><<a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html" title="type parameter in GroupByKeyViaGroupByKeyOnly">K</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><<a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html" title="type parameter in GroupByKeyViaGroupByKeyOnly">V</a>>>></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html#expand-org.apache.beam.sdk.values.PCollection-">expand</a></span>(<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><<a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html" title="type parameter in GroupByKeyViaGroupByKeyOnly">K</a>,<a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html" title="type parameter in GroupByKeyViaGroupByKeyOnly">V</a>>> input)</code>
+<div class="block">Applies this <code>PTransform</code> on the given <code>InputT</code>, and returns its
+ <code>Output</code>.</div>
+</td>
+</tr>
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+<div class="subTitle">org.apache.beam.runners.core</div>
+<h2 title="Interface KeyedWorkItem" class="title">Interface KeyedWorkItem<K,ElemT></h2>
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+<pre>public interface <span class="typeNameLabel">KeyedWorkItem<K,ElemT></span></pre>
+<div class="block">Interface that contains all the timers and elements associated with a specific work item.</div>
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