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+<div class="subTitle">org.apache.kafka.clients.producer</div>
+<h2 title="Class KafkaProducer" class="title">Class
KafkaProducer<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>org.apache.kafka.clients.producer.KafkaProducer<K,V></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/Closeable.html?is-external=true";
title="class or interface in java.io">Closeable</a>, <a
href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true";
title="class or interface in java.lang">AutoCloseable</a>, <a
href="../../../../../org/apache/kafka/clients/producer/Producer.html"
title="interface in
org.apache.kafka.clients.producer">Producer</a><K,V></dd>
+</dl>
+<hr>
+<br>
+<pre>public class <span class="strong">KafkaProducer<K,V></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/kafka/clients/producer/Producer.html"
title="interface in
org.apache.kafka.clients.producer">Producer</a><K,V></pre>
+<div class="block">A Kafka client that publishes records to the Kafka cluster.
+ <P>
+ The producer is <i>thread safe</i> and sharing a single producer instance
across threads will generally be faster than
+ having multiple instances.
+ <p>
+ Here is a simple example of using the producer to send records with strings
containing sequential numbers as the key/value
+ pairs.
+ <pre>
+ <code>Properties props = new Properties();
+ props.put("bootstrap.servers", "localhost:9092");
+ props.put("acks", "all");
+ props.put("retries", 0);
+ props.put("batch.size", 16384);
+ props.put("linger.ms", 1);
+ props.put("buffer.memory", 33554432);
+ props.put("key.serializer",
"org.apache.kafka.common.serialization.StringSerializer");
+ props.put("value.serializer",
"org.apache.kafka.common.serialization.StringSerializer");
+
+ Producer<String, String> producer = new KafkaProducer<>(props);
+ for(int i = 0; i < 100; i++)
+ producer.send(new ProducerRecord<String, String>("my-topic",
Integer.toString(i), Integer.toString(i)));
+
+ producer.close();
+ </code></pre>
+ <p>
+ The producer consists of a pool of buffer space that holds records that
haven't yet been transmitted to the server
+ as well as a background I/O thread that is responsible for turning these
records into requests and transmitting them
+ to the cluster. Failure to close the producer after use will leak these
resources.
+ <p>
+ The <a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#send(org.apache.kafka.clients.producer.ProducerRecord)"><code>send()</code></a>
method is asynchronous. When called it adds the record to a buffer of pending
record sends
+ and immediately returns. This allows the producer to batch together
individual records for efficiency.
+ <p>
+ The <code>acks</code> config controls the criteria under which requests are
considered complete. The "all" setting
+ we have specified will result in blocking on the full commit of the record,
the slowest but most durable setting.
+ <p>
+ If the request fails, the producer can automatically retry, though since we
have specified <code>retries</code>
+ as 0 it won't. Enabling retries also opens up the possibility of duplicates
(see the documentation on
+ <a href="http://kafka.apache.org/documentation.html#semantics";>message
delivery semantics</a> for details).
+ <p>
+ The producer maintains buffers of unsent records for each partition. These
buffers are of a size specified by
+ the <code>batch.size</code> config. Making this larger can result in more
batching, but requires more memory (since we will
+ generally have one of these buffers for each active partition).
+ <p>
+ By default a buffer is available to send immediately even if there is
additional unused space in the buffer. However if you
+ want to reduce the number of requests you can set <code>linger.ms</code> to
something greater than 0. This will
+ instruct the producer to wait up to that number of milliseconds before
sending a request in hope that more records will
+ arrive to fill up the same batch. This is analogous to Nagle's algorithm in
TCP. For example, in the code snippet above,
+ likely all 100 records would be sent in a single request since we set our
linger time to 1 millisecond. However this setting
+ would add 1 millisecond of latency to our request waiting for more records to
arrive if we didn't fill up the buffer. Note that
+ records that arrive close together in time will generally batch together even
with <code>linger.ms=0</code> so under heavy load
+ batching will occur regardless of the linger configuration; however setting
this to something larger than 0 can lead to fewer, more
+ efficient requests when not under maximal load at the cost of a small amount
of latency.
+ <p>
+ The <code>buffer.memory</code> controls the total amount of memory available
to the producer for buffering. If records
+ are sent faster than they can be transmitted to the server then this buffer
space will be exhausted. When the buffer space is
+ exhausted additional send calls will block. The threshold for time to block
is determined by <code>max.block.ms</code> after which it throws
+ a TimeoutException.
+ <p>
+ The <code>key.serializer</code> and <code>value.serializer</code> instruct
how to turn the key and value objects the user provides with
+ their <code>ProducerRecord</code> into bytes. You can use the included <a
href="../../../../../org/apache/kafka/common/serialization/ByteArraySerializer.html"
title="class in
org.apache.kafka.common.serialization"><code>ByteArraySerializer</code></a> or
+ <a
href="../../../../../org/apache/kafka/common/serialization/StringSerializer.html"
title="class in
org.apache.kafka.common.serialization"><code>StringSerializer</code></a> for
simple string or byte types.</div>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ======== CONSTRUCTOR SUMMARY ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor_summary">
+<!-- -->
+</a>
+<h3>Constructor Summary</h3>
+<table class="overviewSummary" 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><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#KafkaProducer(java.util.Map)">KafkaProducer</a></strong>(<a
href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true";
title="class or interface in java.util">Map</a><<a
href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true";
title="class or interface in java.lang">String</a>,<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>> configs)</code>
+<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colOne"><code><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#KafkaProducer(java.util.Map,%20org.apache.kafka.common.serialization.Serializer,%20org.apache.kafka.common.serialization.Serializer)">KafkaProducer</a></strong>(<a
href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true";
title="class or interface in java.util">Map</a><<a
href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true";
title="class or interface in java.lang">String</a>,<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>> configs,
+ <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>> keySerializer,
+ <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>> valueSerializer)</code>
+<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration, a key and a value <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#KafkaProducer(java.util.Properties)">KafkaProducer</a></strong>(<a
href="http://docs.oracle.com/javase/7/docs/api/java/util/Properties.html?is-external=true";
title="class or interface in java.util">Properties</a> properties)</code>
+<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colOne"><code><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#KafkaProducer(java.util.Properties,%20org.apache.kafka.common.serialization.Serializer,%20org.apache.kafka.common.serialization.Serializer)">KafkaProducer</a></strong>(<a
href="http://docs.oracle.com/javase/7/docs/api/java/util/Properties.html?is-external=true";
title="class or interface in java.util">Properties</a> properties,
+ <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>> keySerializer,
+ <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>> valueSerializer)</code>
+<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration, a key and a value <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+<!-- ========== METHOD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method_summary">
+<!-- -->
+</a>
+<h3>Method Summary</h3>
+<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0"
summary="Method Summary table, listing methods, and an explanation">
+<caption><span>Methods</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#close()">close</a></strong>()</code>
+<div class="block">Close this producer.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#close(long,%20java.util.concurrent.TimeUnit)">close</a></strong>(long timeout,
+ <a
href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/TimeUnit.html?is-external=true";
title="class or interface in
java.util.concurrent">TimeUnit</a> timeUnit)</code>
+<div class="block">This method waits up to <code>timeout</code> for the
producer to complete the sending of all incomplete requests.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#flush()">flush</a></strong>()</code>
+<div class="block">Invoking this method makes all buffered records immediately
available to send (even if <code>linger.ms</code> is
+ greater than 0) and blocks on the completion of the requests associated with
these records.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code><a
href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true";
title="class or interface in java.util">Map</a><<a
href="../../../../../org/apache/kafka/common/MetricName.html" title="class in
org.apache.kafka.common">MetricName</a>,? extends <a
href="../../../../../org/apache/kafka/common/Metric.html" title="interface in
org.apache.kafka.common">Metric</a>></code></td>
+<td class="colLast"><code><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#metrics()">metrics</a></strong>()</code>
+<div class="block">Get the full set of internal metrics maintained by the
producer.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code><a
href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true";
title="class or interface in java.util">List</a><<a
href="../../../../../org/apache/kafka/common/PartitionInfo.html" title="class
in org.apache.kafka.common">PartitionInfo</a>></code></td>
+<td class="colLast"><code><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#partitionsFor(java.lang.String)">partitionsFor</a></strong>(<a
href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true";
title="class or interface in java.lang">String</a> topic)</code>
+<div class="block">Get the partition metadata for the give topic.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code><a
href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html?is-external=true";
title="class or interface in java.util.concurrent">Future</a><<a
href="../../../../../org/apache/kafka/clients/producer/RecordMetadata.html"
title="class in
org.apache.kafka.clients.producer">RecordMetadata</a>></code></td>
+<td class="colLast"><code><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#send(org.apache.kafka.clients.producer.ProducerRecord)">send</a></strong>(<a
href="../../../../../org/apache/kafka/clients/producer/ProducerRecord.html"
title="class in org.apache.kafka.clients.producer">ProducerRecord</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>> record)</code>
+<div class="block">Asynchronously send a record to a topic.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code><a
href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html?is-external=true";
title="class or interface in java.util.concurrent">Future</a><<a
href="../../../../../org/apache/kafka/clients/producer/RecordMetadata.html"
title="class in
org.apache.kafka.clients.producer">RecordMetadata</a>></code></td>
+<td class="colLast"><code><strong><a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#send(org.apache.kafka.clients.producer.ProducerRecord,%20org.apache.kafka.clients.producer.Callback)">send</a></strong>(<a
href="../../../../../org/apache/kafka/clients/producer/ProducerRecord.html"
title="class in org.apache.kafka.clients.producer">ProducerRecord</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>> record,
+ <a href="../../../../../org/apache/kafka/clients/producer/Callback.html"
title="interface in
org.apache.kafka.clients.producer">Callback</a> callback)</code>
+<div class="block">Asynchronously send a record to a topic and invoke the
provided callback when the send has been acknowledged.</div>
+</td>
+</tr>
+</table>
+<ul class="blockList">
+<li class="blockList"><a name="methods_inherited_from_class_java.lang.Object">
+<!-- -->
+</a>
+<h3>Methods inherited from class java.lang.<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></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
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title="class or interface in java.lang">getClass</a>, <a
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/Object.html?is-external=true#notifyAll()" title="class or interface in
java.lang">notifyAll</a>, <a
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title="class or interface in java.lang">toString</a>, <a
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title="class or interface in java.lang">wait</a>, <a
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title="class or interface in java.lang">wait</a>, <a
href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)"
title="class or interface in java.lang">wait</a></code></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="details">
+<ul class="blockList">
+<li class="blockList">
+<!-- ========= CONSTRUCTOR DETAIL ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor_detail">
+<!-- -->
+</a>
+<h3>Constructor Detail</h3>
+<a name="KafkaProducer(java.util.Map)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>KafkaProducer</h4>
+<pre>public KafkaProducer(<a
href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true";
title="class or interface in java.util">Map</a><<a
href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true";
title="class or interface in java.lang">String</a>,<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>> configs)</pre>
+<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration. Valid configuration strings
+ are documented <a
href="http://kafka.apache.org/documentation.html#producerconfigs";>here</a>.
Values can be
+ either strings or Objects of the appropriate type (for example a numeric
configuration would accept either the
+ string "42" or the integer 42).</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>configs</code> -
The producer configs</dd></dl>
+</li>
+</ul>
+<a name="KafkaProducer(java.util.Map,
org.apache.kafka.common.serialization.Serializer,
org.apache.kafka.common.serialization.Serializer)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>KafkaProducer</h4>
+<pre>public KafkaProducer(<a
href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true";
title="class or interface in java.util">Map</a><<a
href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true";
title="class or interface in java.lang">String</a>,<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>> configs,
+ <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>> keySerializer,
+ <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>> valueSerializer)</pre>
+<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration, a key and a value <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>.
+ Valid configuration strings are documented <a
href="http://kafka.apache.org/documentation.html#producerconfigs";>here</a>.
+ Values can be either strings or Objects of the appropriate type (for example
a numeric configuration would accept
+ either the string "42" or the integer 42).</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>configs</code> -
The producer configs</dd><dd><code>keySerializer</code> - The serializer for
key that implements <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>. The
configure() method won't be
+ called in the producer when the serializer is passed in
directly.</dd><dd><code>valueSerializer</code> - The serializer for value that
implements <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>. The
configure() method won't
+ be called in the producer when the serializer is
passed in directly.</dd></dl>
+</li>
+</ul>
+<a name="KafkaProducer(java.util.Properties)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>KafkaProducer</h4>
+<pre>public KafkaProducer(<a
href="http://docs.oracle.com/javase/7/docs/api/java/util/Properties.html?is-external=true";
title="class or interface in java.util">Properties</a> properties)</pre>
+<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration. Valid configuration strings
+ are documented <a
href="http://kafka.apache.org/documentation.html#producerconfigs";>here</a>.</div>
+<dl><dt><span
class="strong">Parameters:</span></dt><dd><code>properties</code> - The
producer configs</dd></dl>
+</li>
+</ul>
+<a name="KafkaProducer(java.util.Properties,
org.apache.kafka.common.serialization.Serializer,
org.apache.kafka.common.serialization.Serializer)">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>KafkaProducer</h4>
+<pre>public KafkaProducer(<a
href="http://docs.oracle.com/javase/7/docs/api/java/util/Properties.html?is-external=true";
title="class or interface in java.util">Properties</a> properties,
+ <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>> keySerializer,
+ <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>> valueSerializer)</pre>
+<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration, a key and a value <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>.
+ Valid configuration strings are documented <a
href="http://kafka.apache.org/documentation.html#producerconfigs";>here</a>.</div>
+<dl><dt><span
class="strong">Parameters:</span></dt><dd><code>properties</code> - The
producer configs</dd><dd><code>keySerializer</code> - The serializer for key
that implements <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>. The
configure() method won't be
+ called in the producer when the serializer is passed in
directly.</dd><dd><code>valueSerializer</code> - The serializer for value that
implements <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>. The
configure() method won't
+ be called in the producer when the serializer is
passed in directly.</dd></dl>
+</li>
+</ul>
+</li>
+</ul>
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method_detail">
+<!-- -->
+</a>
+<h3>Method Detail</h3>
+<a name="send(org.apache.kafka.clients.producer.ProducerRecord)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>send</h4>
+<pre>public <a
href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html?is-external=true";
title="class or interface in java.util.concurrent">Future</a><<a
href="../../../../../org/apache/kafka/clients/producer/RecordMetadata.html"
title="class in
org.apache.kafka.clients.producer">RecordMetadata</a>> send(<a
href="../../../../../org/apache/kafka/clients/producer/ProducerRecord.html"
title="class in org.apache.kafka.clients.producer">ProducerRecord</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>> record)</pre>
+<div class="block">Asynchronously send a record to a topic. Equivalent to
<code>send(record, null)</code>.
+ See <a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#send(org.apache.kafka.clients.producer.ProducerRecord,%20org.apache.kafka.clients.producer.Callback)"><code>send(ProducerRecord,
Callback)</code></a> for details.</div>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html#send(org.apache.kafka.clients.producer.ProducerRecord)">send</a></code> in
interface <code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html"
title="interface in org.apache.kafka.clients.producer">Producer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>></code></dd>
+<dt><span class="strong">Parameters:</span></dt><dd><code>record</code> - The
record to send</dd>
+<dt><span class="strong">Returns:</span></dt><dd>A future which will
eventually contain the response information</dd></dl>
+</li>
+</ul>
+<a name="send(org.apache.kafka.clients.producer.ProducerRecord,
org.apache.kafka.clients.producer.Callback)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>send</h4>
+<pre>public <a
href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html?is-external=true";
title="class or interface in java.util.concurrent">Future</a><<a
href="../../../../../org/apache/kafka/clients/producer/RecordMetadata.html"
title="class in
org.apache.kafka.clients.producer">RecordMetadata</a>> send(<a
href="../../../../../org/apache/kafka/clients/producer/ProducerRecord.html"
title="class in org.apache.kafka.clients.producer">ProducerRecord</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>> record,
+ <a
href="../../../../../org/apache/kafka/clients/producer/Callback.html"
title="interface in
org.apache.kafka.clients.producer">Callback</a> callback)</pre>
+<div class="block">Asynchronously send a record to a topic and invoke the
provided callback when the send has been acknowledged.
+ <p>
+ The send is asynchronous and this method will return immediately once the
record has been stored in the buffer of
+ records waiting to be sent. This allows sending many records in parallel
without blocking to wait for the
+ response after each one.
+ <p>
+ The result of the send is a <a
href="../../../../../org/apache/kafka/clients/producer/RecordMetadata.html"
title="class in
org.apache.kafka.clients.producer"><code>RecordMetadata</code></a> specifying
the partition the record was sent to, the offset
+ it was assigned and the timestamp of the record. If
+ <code>CreateTime</code> is used by the topic, the timestamp
+ will be the user provided timestamp or the record send time if the user did
not specify a timestamp for the
+ record. If <code>LogAppendTime</code> is used for the
+ topic, the timestamp will be the Kafka broker local time when the message is
appended.
+ <p>
+ Since the send call is asynchronous it returns a <a
href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html?is-external=true";
title="class or interface in java.util.concurrent"><code>Future</code></a> for
the
+ <a
href="../../../../../org/apache/kafka/clients/producer/RecordMetadata.html"
title="class in
org.apache.kafka.clients.producer"><code>RecordMetadata</code></a> that will be
assigned to this record. Invoking <a
href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html?is-external=true#get()"
title="class or interface in java.util.concurrent"><code>get()</code></a> on
this future will block until the associated request completes and then return
the metadata for the record
+ or throw any exception that occurred while sending the record.
+ <p>
+ If you want to simulate a simple blocking call you can call the
<code>get()</code> method immediately:
+
+ <pre>
+ <code>byte[] key = "key".getBytes();
+ byte[] value = "value".getBytes();
+ ProducerRecord<byte[],byte[]> record = new
ProducerRecord<byte[],byte[]>("my-topic", key, value)
+ producer.send(record).get();
+ </code></pre>
+ <p>
+ Fully non-blocking usage can make use of the <a
href="../../../../../org/apache/kafka/clients/producer/Callback.html"
title="interface in
org.apache.kafka.clients.producer"><code>Callback</code></a> parameter to
provide a callback that
+ will be invoked when the request is complete.
+
+ <pre>
+ <code>ProducerRecord<byte[],byte[]> record = new
ProducerRecord<byte[],byte[]>("the-topic", key, value);
+ producer.send(myRecord,
+ new Callback() {
+ public void onCompletion(RecordMetadata metadata, Exception
e) {
+ if(e != null) {
+ e.printStackTrace();
+ } else {
+ System.out.println("The offset of the record we just
sent is: " + metadata.offset());
+ }
+ }
+ });
+ </code>
+ </pre>
+
+ Callbacks for records being sent to the same partition are guaranteed to
execute in order. That is, in the
+ following example <code>callback1</code> is guaranteed to execute before
<code>callback2</code>:
+
+ <pre>
+ <code>producer.send(new ProducerRecord<byte[],byte[]>(topic, partition,
key1, value1), callback1);
+ producer.send(new ProducerRecord<byte[],byte[]>(topic, partition, key2,
value2), callback2);
+ </code>
+ </pre>
+ <p>
+ Note that callbacks will generally execute in the I/O thread of the producer
and so should be reasonably fast or
+ they will delay the sending of messages from other threads. If you want to
execute blocking or computationally
+ expensive callbacks it is recommended to use your own <a
href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Executor.html?is-external=true";
title="class or interface in java.util.concurrent"><code>Executor</code></a>
in the callback body
+ to parallelize processing.</div>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html#send(org.apache.kafka.clients.producer.ProducerRecord,%20org.apache.kafka.clients.producer.Callback)">send</a></code> in
interface <code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html"
title="interface in org.apache.kafka.clients.producer">Producer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>></code></dd>
+<dt><span class="strong">Parameters:</span></dt><dd><code>record</code> - The
record to send</dd><dd><code>callback</code> - A user-supplied callback to
execute when the record has been acknowledged by the server (null
+ indicates no callback)</dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/common/errors/InterruptException.html"
title="class in org.apache.kafka.common.errors">InterruptException</a></code> -
If the thread is interrupted while blocked</dd>
+<dd><code><a
href="../../../../../org/apache/kafka/common/errors/SerializationException.html"
title="class in
org.apache.kafka.common.errors">SerializationException</a></code> - If the key
or value are not valid objects given the configured serializers</dd>
+<dd><code><a
href="../../../../../org/apache/kafka/common/errors/TimeoutException.html"
title="class in org.apache.kafka.common.errors">TimeoutException</a></code> -
if the time taken for fetching metadata or allocating memory for the record has
surpassed <code>max.block.ms</code>.</dd></dl>
+</li>
+</ul>
+<a name="flush()">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>flush</h4>
+<pre>public void flush()</pre>
+<div class="block">Invoking this method makes all buffered records immediately
available to send (even if <code>linger.ms</code> is
+ greater than 0) and blocks on the completion of the requests associated with
these records. The post-condition
+ of <code>flush()</code> is that any previously sent record will have
completed (e.g. <code>Future.isDone() == true</code>).
+ A request is considered completed when it is successfully acknowledged
+ according to the <code>acks</code> configuration you have specified or else
it results in an error.
+ <p>
+ Other threads can continue sending records while one thread is blocked
waiting for a flush call to complete,
+ however no guarantee is made about the completion of records sent after the
flush call begins.
+ <p>
+ This method can be useful when consuming from some input system and producing
into Kafka. The <code>flush()</code> call
+ gives a convenient way to ensure all previously sent messages have actually
completed.
+ <p>
+ This example shows how to consume from one Kafka topic and produce to another
Kafka topic:
+ <pre>
+ <code>for(ConsumerRecord<String, String> record: consumer.poll(100))
+ producer.send(new ProducerRecord("my-topic", record.key(),
record.value());
+ producer.flush();
+ consumer.commit();
+ </code>
+ </pre>
+
+ Note that the above example may drop records if the produce request fails. If
we want to ensure that this does not occur
+ we need to set <code>retries=<large_number></code> in our config.</div>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html#flush()">flush</a></code> in
interface <code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html"
title="interface in org.apache.kafka.clients.producer">Producer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>></code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/common/errors/InterruptException.html"
title="class in org.apache.kafka.common.errors">InterruptException</a></code> -
If the thread is interrupted while blocked</dd></dl>
+</li>
+</ul>
+<a name="partitionsFor(java.lang.String)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>partitionsFor</h4>
+<pre>public <a
href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true";
title="class or interface in java.util">List</a><<a
href="../../../../../org/apache/kafka/common/PartitionInfo.html" title="class
in org.apache.kafka.common">PartitionInfo</a>> partitionsFor(<a
href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true";
title="class or interface in java.lang">String</a> topic)</pre>
+<div class="block">Get the partition metadata for the give topic. This can be
used for custom partitioning.</div>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html#partitionsFor(java.lang.String)">partitionsFor</a></code> in
interface <code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html"
title="interface in org.apache.kafka.clients.producer">Producer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>></code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/common/errors/InterruptException.html"
title="class in org.apache.kafka.common.errors">InterruptException</a></code> -
If the thread is interrupted while blocked</dd></dl>
+</li>
+</ul>
+<a name="metrics()">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>metrics</h4>
+<pre>public <a
href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true";
title="class or interface in java.util">Map</a><<a
href="../../../../../org/apache/kafka/common/MetricName.html" title="class in
org.apache.kafka.common">MetricName</a>,? extends <a
href="../../../../../org/apache/kafka/common/Metric.html" title="interface in
org.apache.kafka.common">Metric</a>> metrics()</pre>
+<div class="block">Get the full set of internal metrics maintained by the
producer.</div>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html#metrics()">metrics</a></code> in
interface <code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html"
title="interface in org.apache.kafka.clients.producer">Producer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>></code></dd>
+</dl>
+</li>
+</ul>
+<a name="close()">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>close</h4>
+<pre>public void close()</pre>
+<div class="block">Close this producer. This method blocks until all
previously sent requests complete.
+ This method is equivalent to <code>close(Long.MAX_VALUE,
TimeUnit.MILLISECONDS)</code>.
+ <p>
+ <strong>If close() is called from <a
href="../../../../../org/apache/kafka/clients/producer/Callback.html"
title="interface in
org.apache.kafka.clients.producer"><code>Callback</code></a>, a warning message
will be logged and close(0, TimeUnit.MILLISECONDS)
+ will be called instead. We do this because the sender thread would otherwise
try to join itself and
+ block forever.</strong>
+ <p></div>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a
href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true#close()"
title="class or interface in java.io">close</a></code> in
interface <code><a
href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true";
title="class or interface in java.io">Closeable</a></code></dd>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a
href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true#close()"
title="class or interface in java.lang">close</a></code> in
interface <code><a
href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true";
title="class or interface in java.lang">AutoCloseable</a></code></dd>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html#close()">close</a></code> in
interface <code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html"
title="interface in org.apache.kafka.clients.producer">Producer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>></code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/common/errors/InterruptException.html"
title="class in org.apache.kafka.common.errors">InterruptException</a></code> -
If the thread is interrupted while blocked</dd></dl>
+</li>
+</ul>
+<a name="close(long, java.util.concurrent.TimeUnit)">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>close</h4>
+<pre>public void close(long timeout,
+ <a
href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/TimeUnit.html?is-external=true";
title="class or interface in
java.util.concurrent">TimeUnit</a> timeUnit)</pre>
+<div class="block">This method waits up to <code>timeout</code> for the
producer to complete the sending of all incomplete requests.
+ <p>
+ If the producer is unable to complete all requests before the timeout
expires, this method will fail
+ any unsent and unacknowledged records immediately.
+ <p>
+ If invoked from within a <a
href="../../../../../org/apache/kafka/clients/producer/Callback.html"
title="interface in
org.apache.kafka.clients.producer"><code>Callback</code></a> this method will
not block and will be equivalent to
+ <code>close(0, TimeUnit.MILLISECONDS)</code>. This is done since no further
sending will happen while
+ blocking the I/O thread of the producer.</div>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html#close(long,%20java.util.concurrent.TimeUnit)">close</a></code> in
interface <code><a
href="../../../../../org/apache/kafka/clients/producer/Producer.html"
title="interface in org.apache.kafka.clients.producer">Producer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>></code></dd>
+<dt><span class="strong">Parameters:</span></dt><dd><code>timeout</code> - The
maximum time to wait for producer to complete any pending requests. The value
should be
+ non-negative. Specifying a timeout of zero means do not wait
for pending send requests to complete.</dd><dd><code>timeUnit</code> - The time
unit for the <code>timeout</code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a
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