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<div class="subTitle">org.apache.beam.sdk.transforms.splittabledofn</div>
<h2 title="Class ByteKeyRangeTracker" class="title">Class ByteKeyRangeTracker</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a>,<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html" title="class in org.apache.beam.sdk.io.range">ByteKey</a>&gt;</li>
<li>
<ul class="inheritance">
<li>org.apache.beam.sdk.transforms.splittabledofn.ByteKeyRangeTracker</li>
</ul>
</li>
</ul>
</li>
</ul>
<div class="description">
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/Sizes.HasSize.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">Sizes.HasSize</a></dd>
</dl>
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<br>
<pre>public class <span class="typeNameLabel">ByteKeyRangeTracker</span>
extends <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a>,<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html" title="class in org.apache.beam.sdk.io.range">ByteKey</a>&gt;
implements <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/Sizes.HasSize.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">Sizes.HasSize</a></pre>
<div class="block">A <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn"><code>RestrictionTracker</code></a> for claiming <a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html" title="class in org.apache.beam.sdk.io.range"><code>ByteKey</code></a>s in a <a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range"><code>ByteKeyRange</code></a> in a
monotonically increasing fashion. The range is a semi-open bounded interval [startKey, endKey)
where the limits are both represented by <a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html#EMPTY"><code>ByteKey.EMPTY</code></a>.
<p>Note, one can complete a range by claiming the <a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html#EMPTY"><code>ByteKey.EMPTY</code></a> once one runs out of keys
to process.</div>
</li>
</ul>
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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">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></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>
<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ByteKeyRangeTracker.html#checkDone--">checkDone</a></span>()</code>
<div class="block">Called by the runner after <code>DoFn.ProcessElement</code> returns.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ByteKeyRangeTracker.html#checkpoint--">checkpoint</a></span>()</code>
<div class="block">Signals that the current <code>DoFn.ProcessElement</code> call should terminate as soon as possible:
after this method returns, the tracker MUST refuse all future claim calls, and <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkDone--"><code>RestrictionTracker.checkDone()</code></a> MUST succeed.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ByteKeyRangeTracker.html#currentRestriction--">currentRestriction</a></span>()</code>
<div class="block">Returns a restriction accurately describing the full range of work the current <code>DoFn.ProcessElement</code> call will do, including already completed work.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ByteKeyRangeTracker.html#getSize--">getSize</a></span>()</code>
<div class="block">A representation for the amount of known work represented as a size.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ByteKeyRangeTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">ByteKeyRangeTracker</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ByteKeyRangeTracker.html#of-org.apache.beam.sdk.io.range.ByteKeyRange-">of</a></span>(<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a>&nbsp;range)</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ByteKeyRangeTracker.html#toString--">toString</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ByteKeyRangeTracker.html#tryClaim-org.apache.beam.sdk.io.range.ByteKey-">tryClaim</a></span>(<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html" title="class in org.apache.beam.sdk.io.range">ByteKey</a>&nbsp;key)</code>
<div class="block">Attempts to claim the given key.</div>
</td>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h4>of</h4>
<pre>public static&nbsp;<a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ByteKeyRangeTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">ByteKeyRangeTracker</a>&nbsp;of(<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a>&nbsp;range)</pre>
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<h4>currentRestriction</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a>&nbsp;currentRestriction()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#currentRestriction--">RestrictionTracker</a></code></span></div>
<div class="block">Returns a restriction accurately describing the full range of work the current <code>DoFn.ProcessElement</code> call will do, including already completed work.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#currentRestriction--">currentRestriction</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a>,<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html" title="class in org.apache.beam.sdk.io.range">ByteKey</a>&gt;</code></dd>
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<h4>checkpoint</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a>&nbsp;checkpoint()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkpoint--">RestrictionTracker</a></code></span></div>
<div class="block">Signals that the current <code>DoFn.ProcessElement</code> call should terminate as soon as possible:
after this method returns, the tracker MUST refuse all future claim calls, and <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkDone--"><code>RestrictionTracker.checkDone()</code></a> MUST succeed.
<p>Modifies <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#currentRestriction--"><code>RestrictionTracker.currentRestriction()</code></a>. Returns a restriction representing the rest of the
work: the old value of <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#currentRestriction--"><code>RestrictionTracker.currentRestriction()</code></a> is equivalent to the new value and the
return value of this method combined.
<p>Must be called at most once on a given object.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkpoint--">checkpoint</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a>,<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html" title="class in org.apache.beam.sdk.io.range">ByteKey</a>&gt;</code></dd>
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<a name="tryClaim-org.apache.beam.sdk.io.range.ByteKey-">
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<h4>tryClaim</h4>
<pre>public&nbsp;boolean&nbsp;tryClaim(<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html" title="class in org.apache.beam.sdk.io.range">ByteKey</a>&nbsp;key)</pre>
<div class="block">Attempts to claim the given key.
<p>Must be larger than the last attempted key. Since this restriction tracker represents a
range over a semi-open bounded interval <code>[start, end)</code>, the last key that was attempted
may have failed but still have consumed the interval <code>[lastAttemptedKey, end)</code> since this
range tracker processes keys in a monotonically increasing order. Note that passing in <a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html#EMPTY"><code>ByteKey.EMPTY</code></a> claims all keys to the end of range and can only be claimed once.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#tryClaim-PositionT-">tryClaim</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a>,<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html" title="class in org.apache.beam.sdk.io.range">ByteKey</a>&gt;</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if the key was successfully claimed, <code>false</code> if it is outside the
current <a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range"><code>ByteKeyRange</code></a> of this tracker.</dd>
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<h4>checkDone</h4>
<pre>public&nbsp;void&nbsp;checkDone()
throws java.lang.IllegalStateException</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkDone--">RestrictionTracker</a></code></span></div>
<div class="block">Called by the runner after <code>DoFn.ProcessElement</code> returns.
<p>Must throw an exception with an informative error message, if there is still any unclaimed
work remaining in the restriction.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkDone--">checkDone</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKeyRange.html" title="class in org.apache.beam.sdk.io.range">ByteKeyRange</a>,<a href="../../../../../../org/apache/beam/sdk/io/range/ByteKey.html" title="class in org.apache.beam.sdk.io.range">ByteKey</a>&gt;</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code></dd>
</dl>
</li>
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<a name="toString--">
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<h4>toString</h4>
<pre>public&nbsp;java.lang.String&nbsp;toString()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>toString</code>&nbsp;in class&nbsp;<code>java.lang.Object</code></dd>
</dl>
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<h4>getSize</h4>
<pre>public&nbsp;double&nbsp;getSize()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/Sizes.HasSize.html#getSize--">Sizes.HasSize</a></code></span></div>
<div class="block">A representation for the amount of known work represented as a size. Size <code>double</code>
representations should preferably represent a linear space and be comparable within the same
partition.
<p>It is up to each restriction tracker to convert between their natural representation of
outstanding work and this representation. For example:
<ul>
<li>Block based file source (e.g. Avro): From the end of the current block, the remaining
number of bytes to the end of the restriction.
<li>Pull based queue based source (e.g. Pubsub): The local/global size available in number
of messages or number of <code>message bytes</code> that have not been processed.
<li>Key range based source (e.g. Shuffle, Bigtable, ...): Scale the start key to be one and
end key to be zero and interpolate the position of the next splittable key as the size.
If information about the probability density function or cumulative distribution
function is available, size interpolation can be improved. Alternatively, if the number
of encoded bytes for the keys and values is known for the key range, the number of
remaining bytes can be used.
</ul>
<p><a href="../../../../../../org/apache/beam/sdk/transforms/DoFn.html" title="class in org.apache.beam.sdk.transforms"><code>DoFn</code></a>s should provide a method annotated with <code>DoFn.GetPartition</code> to report a
partition identifier if the element and restriction represent the size for a shared resource
such as a message queue topic. See <code>DoFn.GetPartition</code> for additional details.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/Sizes.HasSize.html#getSize--">getSize</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/Sizes.HasSize.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">Sizes.HasSize</a></code></dd>
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