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[39/51] [abbrv] [partial] incubator-beam-site git commit: Rebuild site
http://git-wip-us.apache.org/repos/asf/incubator-beam-site/blob/141627ec/content/learn/sdks/javadoc/0.3.0-incubating/org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html
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+<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">
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+<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>
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+<th class="colLast" scope="col">Class and Description</th>
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+<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>
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+</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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+<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
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+<th class="colOne" scope="col">Constructor and Description</th>
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+<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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+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
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+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.html#apply-org.apache.beam.sdk.values.PCollection-">apply</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
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+<h4>GroupByKeyViaGroupByKeyOnly</h4>
+<pre>public GroupByKeyViaGroupByKeyOnly(<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)</pre>
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+<h4>apply</h4>
+<pre>public <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>>>> apply(<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="../../../../..
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+<div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#apply-InputT-">PTransform</a></code></span></div>
+<div class="block">Applies this <code>PTransform</code> on the given <code>InputT</code>, and returns its
+ <code>Output</code>.
+
+ <p>Composite transforms, which are defined in terms of other transforms,
+ should return the output of one of the composed transforms. 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>
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+<div class="subTitle">org.apache.beam.runners.core</div>
+<h2 title="Class LateDataDroppingDoFnRunner" class="title">Class LateDataDroppingDoFnRunner<K,InputT,OutputT,W extends <a href="../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a>></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>org.apache.beam.runners.core.LateDataDroppingDoFnRunner<K,InputT,OutputT,W></li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt><span class="paramLabel">Type Parameters:</span></dt>
+<dd><code>K</code> - key type</dd>
+<dd><code>InputT</code> - input value element type</dd>
+<dd><code>OutputT</code> - output value element type</dd>
+<dd><code>W</code> - window type</dd>
+</dl>
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd><a href="../../../../../org/apache/beam/runners/core/DoFnRunner.html" title="interface in org.apache.beam.runners.core">DoFnRunner</a><<a href="../../../../../org/apache/beam/sdk/util/KeyedWorkItem.html" title="interface in org.apache.beam.sdk.util">KeyedWorkItem</a><K,InputT>,<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><K,OutputT>></dd>
+</dl>
+<hr>
+<br>
+<pre>public class <span class="typeNameLabel">LateDataDroppingDoFnRunner<K,InputT,OutputT,W extends <a href="../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a>></span>
+extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
+implements <a href="../../../../../org/apache/beam/runners/core/DoFnRunner.html" title="interface in org.apache.beam.runners.core">DoFnRunner</a><<a href="../../../../../org/apache/beam/sdk/util/KeyedWorkItem.html" title="interface in org.apache.beam.sdk.util">KeyedWorkItem</a><K,InputT>,<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><K,OutputT>></pre>
+<div class="block">A customized <a href="../../../../../org/apache/beam/runners/core/DoFnRunner.html" title="interface in org.apache.beam.runners.core"><code>DoFnRunner</code></a> that handles late data dropping for
+ a <a href="../../../../../org/apache/beam/sdk/util/KeyedWorkItem.html" title="interface in org.apache.beam.sdk.util"><code>KeyedWorkItem</code></a> input <a href="../../../../../org/apache/beam/sdk/transforms/OldDoFn.html" title="class in org.apache.beam.sdk.transforms"><code>OldDoFn</code></a>.
+
+ <p>It expands windows before checking data lateness.
+
+ <p><a href="../../../../../org/apache/beam/sdk/util/KeyedWorkItem.html" title="interface in org.apache.beam.sdk.util"><code>KeyedWorkItems</code></a> are always in empty windows.</div>
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+</a>
+<h3>Nested classes/interfaces inherited from interface org.apache.beam.runners.core.<a href="../../../../../org/apache/beam/runners/core/DoFnRunner.html" title="interface in org.apache.beam.runners.core">DoFnRunner</a></h3>
+<code><a href="../../../../../org/apache/beam/runners/core/DoFnRunner.ReduceFnExecutor.html" title="interface in org.apache.beam.runners.core">DoFnRunner.ReduceFnExecutor</a><<a href="../../../../../org/apache/beam/runners/core/DoFnRunner.ReduceFnExecutor.html" title="type parameter in DoFnRunner.ReduceFnExecutor">K</a>,<a href="../../../../../org/apache/beam/runners/core/DoFnRunner.ReduceFnExecutor.html" title="type parameter in DoFnRunner.ReduceFnExecutor">InputT</a>,<a href="../../../../../org/apache/beam/runners/core/DoFnRunner.ReduceFnExecutor.html" title="type parameter in DoFnRunner.ReduceFnExecutor">OutputT</a>,<a href="../../../../../org/apache/beam/runners/core/DoFnRunner.ReduceFnExecutor.html" title="type parameter in DoFnRunner.ReduceFnExecutor">W</a>></code></li>
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+<tr class="altColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/LateDataDroppingDoFnRunner.html#LateDataDroppingDoFnRunner-org.apache.beam.runners.core.DoFnRunner-org.apache.beam.sdk.util.WindowingStrategy-org.apache.beam.sdk.util.TimerInternals-org.apache.beam.sdk.transforms.Aggregator-">LateDataDroppingDoFnRunner</a></span>(<a href="../../../../../org/apache/beam/runners/core/DoFnRunner.html" title="interface in org.apache.beam.runners.core">DoFnRunner</a><<a href="../../../../../org/apache/beam/sdk/util/KeyedWorkItem.html" title="interface in org.apache.beam.sdk.util">KeyedWorkItem</a><<a href="../../../../../org/apache/beam/runners/core/LateDataDroppingDoFnRunner.html" title="type parameter in LateDataDroppingDoFnRunner">K</a>,<a href="../../../../../org/apache/beam/runners/core/LateDataDroppingDoFnRunner.html" title="type parameter in LateDataDroppingDoFnRunner">InputT</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/LateDataDroppingDoFnRunner.html" title="type parameter in LateDataDroppingDoFnRunner">K</a>,<a href="../../../../../org/apache/beam/runners/core/LateDataDroppingDoFnRunner.html" title="type parameter in LateDataDroppingDoFnRunner">OutputT</a>>> doFnRunner,
+ <a href="../../../../../org/apache/beam/sdk/util/WindowingStrategy.html" title="class in org.apache.beam.sdk.util">WindowingStrategy</a><?,?> windowingStrategy,
+ <a href="../../../../../org/apache/beam/sdk/util/TimerInternals.html" title="interface in org.apache.beam.sdk.util">TimerInternals</a> timerInternals,
+ <a href="../../../../../org/apache/beam/sdk/transforms/Aggregator.html" title="interface in org.apache.beam.sdk.transforms">Aggregator</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>> droppedDueToLateness)</code> </td>
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+<tr>
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+<th class="colLast" scope="col">Method and Description</th>
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+<tr id="i0" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/LateDataDroppingDoFnRunner.html#finishBundle--">finishBundle</a></span>()</code>
+<div class="block">Calls <a href="../../../../../org/apache/beam/sdk/transforms/OldDoFn.html#finishBundle-org.apache.beam.sdk.transforms.OldDoFn.Context-"><code>OldDoFn.finishBundle(org.apache.beam.sdk.transforms.OldDoFn<InputT, OutputT>.Context)</code></a> and performs additional tasks, such as
+ flushing in-memory states.</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/LateDataDroppingDoFnRunner.html#processElement-org.apache.beam.sdk.util.WindowedValue-">processElement</a></span>(<a href="../../../../../org/apache/beam/sdk/util/WindowedValue.html" title="class in org.apache.beam.sdk.util">WindowedValue</a><<a href="../../../../../org/apache/beam/sdk/util/KeyedWorkItem.html" title="interface in org.apache.beam.sdk.util">KeyedWorkItem</a><<a href="../../../../../org/apache/beam/runners/core/LateDataDroppingDoFnRunner.html" title="type parameter in LateDataDroppingDoFnRunner">K</a>,<a href="../../../../../org/apache/beam/runners/core/LateDataDroppingDoFnRunner.html" title="type parameter in LateDataDroppingDoFnRunner">InputT</a>>> elem)</code>
+<div class="block">Calls <a href="../../../../../org/apache/beam/sdk/transforms/OldDoFn.html#processElement-org.apache.beam.sdk.transforms.OldDoFn.ProcessContext-"><code>OldDoFn.processElement(org.apache.beam.sdk.transforms.OldDoFn<InputT, OutputT>.ProcessContext)</code></a> with a <a href="../../../../../org/apache/beam/sdk/transforms/OldDoFn.ProcessContext.html" title="class in org.apache.beam.sdk.transforms"><code>OldDoFn.ProcessContext</code></a> containing the current
+ element.</div>
+</td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/LateDataDroppingDoFnRunner.html#startBundle--">startBundle</a></span>()</code>
+<div class="block">Prepares and calls <a href="../../../../../org/apache/beam/sdk/transforms/OldDoFn.html#startBundle-org.apache.beam.sdk.transforms.OldDoFn.Context-"><code>OldDoFn.startBundle(org.apache.beam.sdk.transforms.OldDoFn<InputT, OutputT>.Context)</code></a>.</div>
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+<a name="LateDataDroppingDoFnRunner-org.apache.beam.runners.core.DoFnRunner-org.apache.beam.sdk.util.WindowingStrategy-org.apache.beam.sdk.util.TimerInternals-org.apache.beam.sdk.transforms.Aggregator-">
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+<h4>LateDataDroppingDoFnRunner</h4>
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+<div class="subTitle">org.apache.beam.runners.core</div>
+<h2 title="Class NonEmptyPanes" class="title">Class NonEmptyPanes<K,W extends <a href="../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a>></h2>
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+<li>
+<ul class="inheritance">
+<li>org.apache.beam.runners.core.NonEmptyPanes<K,W></li>
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