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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><<a href="../../../../../org/apache/beam/sdk/util/WindowedValue.html" title="class in org.apache.beam.sdk.util">WindowedValue</a><V>>>>></li> +<li> +<ul class="inheritance"> +<li>org.apache.beam.runners.core.GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly<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> +<dl> +<dt>Enclosing class:</dt> +<dd><a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html" title="class in org.apache.beam.runners.core">GroupByKeyViaGroupByKeyOnly</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>></dd> +</dl> +<hr> +<br> +<pre>public static class <span class="typeNameLabel">GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly<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"; 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title="class or interface in java.lang">Object</a></h3> +<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--"; title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-"; title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--"; title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--"; title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--"; title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--"; title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang /Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--"; 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Non-composite + transforms, which do not apply any transforms internally, should return + a new unbound output and register evaluators (via backend-specific + registration methods).</div> +<dl> +<dt><span class="overrideSpecifyLabel">Specified by:</span></dt> +<dd><code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">expand</a></code> in class <code><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><<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>>>,<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.GroupByKeyOnly.html" title="type parameter in GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly">K</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true"; 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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> +</div> +<div class="summary"> +<ul class="blockList"> +<li class="blockList"> +<!-- ======== NESTED CLASS SUMMARY ======== --> +<ul class="blockList"> +<li class="blockList"><a name="nested.class.summary"> +<!-- --> +</a> +<h3>Nested Class Summary</h3> +<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> +<!-- =========== FIELD SUMMARY =========== --> +<ul class="blockList"> +<li class="blockList"><a name="field.summary"> +<!-- --> +</a> +<h3>Field Summary</h3> +<ul class="blockList"> +<li class="blockList"><a name="fields.inherited.from.class.org.apache.beam.sdk.transforms.PTransform"> +<!-- --> +</a> +<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> +</ul> +</li> +</ul> +<!-- ======== CONSTRUCTOR SUMMARY ======== --> +<ul class="blockList"> +<li class="blockList"><a name="constructor.summary"> +<!-- --> +</a> +<h3>Constructor Summary</h3> +<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> +<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> +</tr> +</table> +</li> +</ul> +<!-- ========== METHOD SUMMARY =========== --> +<ul class="blockList"> +<li class="blockList"><a name="method.summary"> +<!-- --> +</a> +<h3>Method Summary</h3> +<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary 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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> +</table> +<ul class="blockList"> +<li class="blockList"><a name="methods.inherited.from.class.org.apache.beam.sdk.transforms.PTransform"> +<!-- --> +</a> +<h3>Methods 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#getDefaultOutputCoder--">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-">getDefaultOutputCoder</a>, <a 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title="class or interface in java.lang">Iterable</a><<a href="../../../../../org/apache/beam/sdk/util/TimerInternals.TimerData.html" title="class in org.apache.beam.sdk.util">TimerInternals.TimerData</a>></code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/KeyedWorkItem.html#timersIterable--">timersIterable</a></span>()</code> +<div class="block">Returns an iterable containing the timers.</div> +</td> +</tr> +</table> +</li> +</ul> +</li> +</ul> +</div> +<div class="details"> +<ul class="blockList"> +<li class="blockList"> +<!-- ============ METHOD DETAIL ========== --> +<ul class="blockList"> +<li class="blockList"><a name="method.detail"> +<!-- --> +</a> +<h3>Method Detail</h3> +<a name="key--"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>key</h4> +<pre><a href="../../../../../org/apache/beam/runners/core/KeyedWorkItem.html" title="type parameter in KeyedWorkItem">K</a> key()</pre> +<div class="block">Returns the key.</div> +</li> +</ul> +<a name="timersIterable--"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>timersIterable</h4> +<pre><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/sdk/util/TimerInternals.TimerData.html" title="class in org.apache.beam.sdk.util">TimerInternals.TimerData</a>> timersIterable()</pre> +<div class="block">Returns an iterable containing the timers.</div> +</li> +</ul> +<a name="elementsIterable--"> +<!-- --> +</a> +<ul class="blockListLast"> +<li class="blockList"> +<h4>elementsIterable</h4> +<pre><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/sdk/util/WindowedValue.html" title="class in org.apache.beam.sdk.util">WindowedValue</a><<a href="../../../../../org/apache/beam/runners/core/KeyedWorkItem.html" title="type parameter in KeyedWorkItem">ElemT</a>>> elementsIterable()</pre> +<div class="block">Returns an iterable containing the elements.</div> +</li> +</ul> +</li> +</ul> +</li> +</ul> +</div> +</div> +<!-- ========= END OF CLASS DATA ========= --> +<!-- ======= START OF BOTTOM NAVBAR ====== --> +<div class="bottomNav"><a name="navbar.bottom"> +<!-- --> +</a> +<div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> +<a name="navbar.bottom.firstrow"> +<!-- --> +</a> +<ul class="navList" title="Navigation"> +<li><a href="../../../../../overview-summary.html">Overview</a></li> +<li><a href="package-summary.html">Package</a></li> +<li class="navBarCell1Rev">Class</li> +<li><a href="class-use/KeyedWorkItem.html">Use</a></li> +<li><a href="package-tree.html">Tree</a></li> +<li><a href="../../../../../deprecated-list.html">Deprecated</a></li> +<li><a href="../../../../../index-all.html">Index</a></li> +<li><a href="../../../../../help-doc.html">Help</a></li> +</ul> +</div> +<div class="subNav"> +<ul class="navList"> +<li><a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly.html" title="class in org.apache.beam.runners.core"><span class="typeNameLink">Prev Class</span></a></li> +<li><a href="../../../../../org/apache/beam/runners/core/KeyedWorkItemCoder.html" title="class in org.apache.beam.runners.core"><span class="typeNameLink">Next Class</span></a></li> +</ul> +<ul class="navList"> +<li><a href="../../../../../index.html?org/apache/beam/runners/core/KeyedWorkItem.html" target="_top">Frames</a></li> +<li><a href="KeyedWorkItem.html" target="_top">No Frames</a></li> +</ul> +<ul class="navList" id="allclasses_navbar_bottom"> +<li><a href="../../../../../allclasses-noframe.html">All Classes</a></li> +</ul> +<div> +<script type="text/javascript"><!-- + allClassesLink = document.getElementById("allclasses_navbar_bottom"); 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