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From jbono...@apache.org
Subject [37/52] [partial] beam-site git commit: Add 0.4.0 release
Date Wed, 04 Jan 2017 09:57:25 GMT
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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+<div class="header">
+<div class="subTitle">org.apache.beam.runners.core</div>
+<h2 title="Class GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly" class="title">Class GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly&lt;K,V&gt;</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>
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+<pre>public static class <span class="typeNameLabel">GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly&lt;K,V&gt;</span>
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+<div class="block">Runner-specific primitive that groups by key only, ignoring any window assignments. A
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+<div class="header">
+<div class="subTitle">org.apache.beam.runners.core</div>
+<h2 title="Class GroupByKeyViaGroupByKeyOnly" class="title">Class GroupByKeyViaGroupByKeyOnly&lt;K,V&gt;</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>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;K,V&gt;&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;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>&lt;V&gt;&gt;&gt;&gt;</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.beam.runners.core.GroupByKeyViaGroupByKeyOnly&lt;K,V&gt;</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&lt;K,V&gt;</span>
+extends <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;K,V&gt;&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;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>&lt;V&gt;&gt;&gt;&gt;</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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+<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</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&nbsp;</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>&lt;<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>&gt;</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&nbsp;</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>&lt;<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>&gt;</span></code>
+<div class="block">Runner-specific primitive that groups by key only, ignoring any window assignments.</div>
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+</ul>
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+<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#name">name</a></code></li>
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+<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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+<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>&lt;<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>&gt;&nbsp;originalTransform)</code>&nbsp;</td>
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+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a 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>
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+<h2 title="Interface KeyedWorkItem" class="title">Interface KeyedWorkItem&lt;K,ElemT&gt;</h2>
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