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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.nemo.runtime.executor.data.block</a></div>
<h2 title="Interface Block" class="title">Interface Block&lt;K extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Serializable.html?is-external=true" title="class or interface in java.io" class="externalLink">Serializable</a>&gt;</h2>
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<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>K</code> - the key type of its partitions.</dd>
</dl>
<dl>
<dt>All Known Implementing Classes:</dt>
<dd><code><a href="FileBlock.html" title="class in org.apache.nemo.runtime.executor.data.block">FileBlock</a></code>, <code><a href="NonSerializedMemoryBlock.html" title="class in org.apache.nemo.runtime.executor.data.block">NonSerializedMemoryBlock</a></code>, <code><a href="SerializedMemoryBlock.html" title="class in org.apache.nemo.runtime.executor.data.block">SerializedMemoryBlock</a></code></dd>
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<pre>public interface <span class="typeNameLabel">Block&lt;K extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Serializable.html?is-external=true" title="class or interface in java.io" class="externalLink">Serializable</a>&gt;</span></pre>
<div class="block">This interface represents a block, which is the output of a specific task.</div>
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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="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Optional.html?is-external=true" title="class or interface in java.util" class="externalLink">Optional</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html?is-external=true" title="class or interface in java.util" class="externalLink">Map</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>,&#8203;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Long.html?is-external=true" title="class or interface in java.lang" class="externalLink">Long</a>&gt;&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#commit()">commit</a></span>()</code></th>
<td class="colLast">
<div class="block">Commits this block to prevent further write.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#commitPartitions()">commitPartitions</a></span>()</code></th>
<td class="colLast">
<div class="block">Commits all un-committed partitions.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getId()">getId</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isCommitted()">isCommitted</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Iterable</a>&lt;<a href="../partition/NonSerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition">NonSerializedPartition</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#readPartitions(org.apache.nemo.common.KeyRange)">readPartitions</a></span>&#8203;(<a href="../../../../common/KeyRange.html" title="interface in org.apache.nemo.common">KeyRange</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&nbsp;keyRange)</code></th>
<td class="colLast">
<div class="block">Retrieves the <a href="../partition/NonSerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>NonSerializedPartition</code></a>s in a specific key range from this block.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Iterable</a>&lt;<a href="../partition/SerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition">SerializedPartition</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#readSerializedPartitions(org.apache.nemo.common.KeyRange)">readSerializedPartitions</a></span>&#8203;(<a href="../../../../common/KeyRange.html" title="interface in org.apache.nemo.common">KeyRange</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&nbsp;keyRange)</code></th>
<td class="colLast">
<div class="block">Retrieves the <a href="../partition/SerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>SerializedPartition</code></a>s in a specific key range.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#write(K,java.lang.Object)">write</a></span>&#8203;(<a href="Block.html" title="type parameter in Block">K</a>&nbsp;key,
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;element)</code></th>
<td class="colLast">
<div class="block">Writes an element to non-committed block.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#writePartitions(java.lang.Iterable)">writePartitions</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Iterable</a>&lt;<a href="../partition/NonSerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition">NonSerializedPartition</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&gt;&nbsp;partitions)</code></th>
<td class="colLast">
<div class="block">Stores <a href="../partition/NonSerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>NonSerializedPartition</code></a>s to this block.</div>
</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#writeSerializedPartitions(java.lang.Iterable)">writeSerializedPartitions</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Iterable</a>&lt;<a href="../partition/SerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition">SerializedPartition</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&gt;&nbsp;partitions)</code></th>
<td class="colLast">
<div class="block">Stores <a href="../partition/SerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>SerializedPartition</code></a>s to this block.</div>
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<h4>write</h4>
<pre class="methodSignature">void&nbsp;write&#8203;(<a href="Block.html" title="type parameter in Block">K</a>&nbsp;key,
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;element)</pre>
<div class="block">Writes an element to non-committed block.
Invariant: This should not be invoked after this block is committed.
Invariant: This method does not support concurrent write.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - the key.</dd>
<dd><code>element</code> - the element to write.
Classes implementing this interface may throw
org.apache.nemo.common.exception.BlockWriteException for any error occurred while trying to write a block.
(This exception will be thrown to the scheduler
through <a href="../../Executor.html" title="class in org.apache.nemo.runtime.executor"><code>Executor</code></a> and
have to be handled by the scheduler with fault tolerance mechanism.)</dd>
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<h4>writePartitions</h4>
<pre class="methodSignature">void&nbsp;writePartitions&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Iterable</a>&lt;<a href="../partition/NonSerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition">NonSerializedPartition</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&gt;&nbsp;partitions)</pre>
<div class="block">Stores <a href="../partition/NonSerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>NonSerializedPartition</code></a>s to this block.
Invariant: This should not be invoked after this block is committed.
Invariant: This method does not support concurrent write.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>partitions</code> - the <a href="../partition/NonSerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>NonSerializedPartition</code></a>s to store.
Classes implementing this interface may throw
org.apache.nemo.common.exception.BlockWriteException for any error occurred while trying to write a block.
(This exception will be thrown to the scheduler
through <a href="../../Executor.html" title="class in org.apache.nemo.runtime.executor"><code>Executor</code></a> and
have to be handled by the scheduler with fault tolerance mechanism.)</dd>
</dl>
</li>
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<h4>writeSerializedPartitions</h4>
<pre class="methodSignature">void&nbsp;writeSerializedPartitions&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Iterable</a>&lt;<a href="../partition/SerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition">SerializedPartition</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&gt;&nbsp;partitions)</pre>
<div class="block">Stores <a href="../partition/SerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>SerializedPartition</code></a>s to this block.
Invariant: This should not be invoked after this block is committed.
Invariant: This method does not support concurrent write.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>partitions</code> - the <a href="../partition/SerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>SerializedPartition</code></a>s to store.
Classes implementing this interface may throw
org.apache.nemo.common.exception.BlockWriteException for any error occurred while trying to write a block.
(This exception will be thrown to the scheduler
through <a href="../../Executor.html" title="class in org.apache.nemo.runtime.executor"><code>Executor</code></a> and
have to be handled by the scheduler with fault tolerance mechanism.)</dd>
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<h4>readPartitions</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Iterable</a>&lt;<a href="../partition/NonSerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition">NonSerializedPartition</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&gt;&nbsp;readPartitions&#8203;(<a href="../../../../common/KeyRange.html" title="interface in org.apache.nemo.common">KeyRange</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&nbsp;keyRange)</pre>
<div class="block">Retrieves the <a href="../partition/NonSerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>NonSerializedPartition</code></a>s in a specific key range from this block.
If the data is serialized, deserializes it.
Invariant: This should not be invoked before this block is committed.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>keyRange</code> - the key range to retrieve.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an iterable of <a href="../partition/NonSerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>NonSerializedPartition</code></a>s.
Classes implementing this interface may throw
org.apache.nemo.common.exception.BlockFetchException for any error occurred while trying to fetch a block.
(This exception will be thrown to the scheduler
through <a href="../../Executor.html" title="class in org.apache.nemo.runtime.executor"><code>Executor</code></a> and
have to be handled by the scheduler with fault tolerance mechanism.)</dd>
</dl>
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<h4>readSerializedPartitions</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Iterable</a>&lt;<a href="../partition/SerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition">SerializedPartition</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&gt;&nbsp;readSerializedPartitions&#8203;(<a href="../../../../common/KeyRange.html" title="interface in org.apache.nemo.common">KeyRange</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>&gt;&nbsp;keyRange)</pre>
<div class="block">Retrieves the <a href="../partition/SerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>SerializedPartition</code></a>s in a specific key range.
Invariant: This should not be invoked before this block is committed.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>keyRange</code> - the hash range to retrieve.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an iterable of <a href="../partition/SerializedPartition.html" title="class in org.apache.nemo.runtime.executor.data.partition"><code>SerializedPartition</code></a>s.
Classes implementing this interface may throw
org.apache.nemo.common.exception.BlockFetchException for any error occurred while trying to fetch a block.
(This exception will be thrown to the scheduler
through <a href="../../Executor.html" title="class in org.apache.nemo.runtime.executor"><code>Executor</code></a> and
have to be handled by the scheduler with fault tolerance mechanism.)</dd>
</dl>
</li>
</ul>
<a id="commit()">
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<h4>commit</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Optional.html?is-external=true" title="class or interface in java.util" class="externalLink">Optional</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html?is-external=true" title="class or interface in java.util" class="externalLink">Map</a>&lt;<a href="Block.html" title="type parameter in Block">K</a>,&#8203;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Long.html?is-external=true" title="class or interface in java.lang" class="externalLink">Long</a>&gt;&gt;&nbsp;commit()</pre>
<div class="block">Commits this block to prevent further write.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the size of each partition if the data in the block is serialized.
Classes implementing this interface may throw
org.apache.nemo.common.exception.BlockWriteException for any error occurred while trying to commit a block.
(This exception will be thrown to the scheduler
through <a href="../../Executor.html" title="class in org.apache.nemo.runtime.executor"><code>Executor</code></a> and
have to be handled by the scheduler with fault tolerance mechanism.)</dd>
</dl>
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<h4>commitPartitions</h4>
<pre class="methodSignature">void&nbsp;commitPartitions()</pre>
<div class="block">Commits all un-committed partitions.
This method can be useful if partitions in a block should be committed before the block is committed totally.
For example, non-committed partitions in a file block can be flushed to storage from memory.
If another element is written after this method is called, a new non-committed partition should be created
for the element even if a partition with the same key is committed already.
Classes implementing this interface may throw
org.apache.nemo.common.exception.BlockWriteException for any error occurred
while trying to commit partitions.
(This exception will be thrown to the scheduler
through <a href="../../Executor.html" title="class in org.apache.nemo.runtime.executor"><code>Executor</code></a> and
have to be handled by the scheduler with fault tolerance mechanism.)</div>
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<a id="getId()">
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<h4>getId</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;getId()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the ID of this block.</dd>
</dl>
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<h4>isCommitted</h4>
<pre class="methodSignature">boolean&nbsp;isCommitted()</pre>
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<dt><span class="returnLabel">Returns:</span></dt>
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