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From gwens...@apache.org
Subject [43/51] [partial] kafka-site git commit: KAFKA-2425: Initial upload of Kafka documentation to git repository with intent to replace SVN
Date Fri, 02 Oct 2015 19:19:41 GMT
http://git-wip-us.apache.org/repos/asf/kafka-site/blob/ba6c994c/082/implementation.html
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+<h3><a id="apidesign">5.1 API Design</a></h3>
+
+<h4>Producer APIs</h4>
+
+<p>
+The Producer API that wraps the 2 low-level producers - <code>kafka.producer.SyncProducer</code> and <code>kafka.producer.async.AsyncProducer</code>. 
+<pre>
+class Producer<T> {
+	
+  /* Sends the data, partitioned by key to the topic using either the */
+  /* synchronous or the asynchronous producer */
+  public void send(kafka.javaapi.producer.ProducerData&lt;K,V&gt; producerData);
+
+  /* Sends a list of data, partitioned by key to the topic using either */
+  /* the synchronous or the asynchronous producer */
+  public void send(java.util.List&lt;kafka.javaapi.producer.ProducerData&lt;K,V&gt;&gt; producerData);
+
+  /* Closes the producer and cleans up */	
+  public void close();
+
+}
+</pre>
+
+The goal is to expose all the producer functionality through a single API to the client.  
+
+The new producer -
+<ul>
+<li>can handle queueing/buffering of multiple producer requests and asynchronous dispatch of the batched data - 	
+<p><code>kafka.producer.Producer</code> provides the ability to batch multiple produce requests (<code>producer.type=async</code>), before serializing and dispatching them to the appropriate kafka broker partition. The size of the batch can be controlled by a few config parameters. As events enter a queue, they are buffered in a queue, until either <code>queue.time</code> or <code>batch.size</code> is reached. A background thread (<code>kafka.producer.async.ProducerSendThread</code>) dequeues the batch of data and lets the <code>kafka.producer.EventHandler</code> serialize and send the data to the appropriate kafka broker partition. A custom event handler can be plugged in through the <code>event.handler</code> config parameter. At various stages of this producer queue pipeline, it is helpful to be able to inject callbacks, either for plugging in custom logging/tracing code or custom monitoring logic. This is possible by implementing the <code>kafka.producer.async.CallbackHandler</c
 ode> interface and setting <code>callback.handler</code> config parameter to that class.
+</p>
+</li>
+<li>handles the serialization of data through a user-specified <code>Encoder</code> - 
+<pre>
+interface Encoder&lt;T&gt; {
+  public Message toMessage(T data);
+}
+</pre>
+<p>The default is the no-op <code>kafka.serializer.DefaultEncoder</code></p>
+</li>
+<li>provides software load balancing through an optionally user-specified <code>Partitioner</code> - 
+<p>
+The routing decision is influenced by the <code>kafka.producer.Partitioner</code>. 
+<pre>
+interface Partitioner&lt;T&gt; {
+   int partition(T key, int numPartitions);
+}
+</pre>
+The partition API uses the key and the number of available broker partitions to return a partition id. This id is used as an index into a sorted list of broker_ids and partitions to pick a broker partition for the producer request. The default partitioning strategy is <code>hash(key)%numPartitions</code>. If the key is null, then a random broker partition is picked. A custom partitioning strategy can also be plugged in using the <code>partitioner.class</code> config parameter.	
+</p>
+</li>
+</ul>
+</p>
+
+<h4>Consumer APIs</h4>
+<p>
+We have 2 levels of consumer APIs. The low-level "simple" API maintains a connection to a single broker and has a close correspondence to the network requests sent to the server. This API is completely stateless, with the offset being passed in on every request, allowing the user to maintain this metadata however they choose.
+</p>
+<p>
+The high-level API hides the details of brokers from the consumer and allows consuming off the cluster of machines without concern for the underlying topology. It also maintains the state of what has been consumed. The high-level API also provides the ability to subscribe to topics that match a filter expression (i.e., either a whitelist or a blacklist regular expression).
+</p>
+
+<h5>Low-level API</h5>
+<pre>
+class SimpleConsumer {
+	
+  /* Send fetch request to a broker and get back a set of messages. */ 
+  public ByteBufferMessageSet fetch(FetchRequest request);
+
+  /* Send a list of fetch requests to a broker and get back a response set. */ 
+  public MultiFetchResponse multifetch(List&lt;FetchRequest&gt; fetches);
+
+  /**
+   * Get a list of valid offsets (up to maxSize) before the given time.
+   * The result is a list of offsets, in descending order.
+   * @param time: time in millisecs,
+   *              if set to OffsetRequest$.MODULE$.LATIEST_TIME(), get from the latest offset available.
+   *              if set to OffsetRequest$.MODULE$.EARLIEST_TIME(), get from the earliest offset available.
+   */
+  public long[] getOffsetsBefore(String topic, int partition, long time, int maxNumOffsets);
+}
+</pre>
+
+The low-level API is used to implement the high-level API as well as being used directly for some of our offline consumers (such as the hadoop consumer) which have particular requirements around maintaining state.
+
+<h5>High-level API</h5>
+<pre>
+
+/* create a connection to the cluster */ 
+ConsumerConnector connector = Consumer.create(consumerConfig);
+
+interface ConsumerConnector {
+	
+  /**
+   * This method is used to get a list of KafkaStreams, which are iterators over
+   * MessageAndMetadata objects from which you can obtain messages and their
+   * associated metadata (currently only topic).
+   *  Input: a map of &lt;topic, #streams&gt;
+   *  Output: a map of &lt;topic, list of message streams&gt;
+   */
+  public Map&lt;String,List&lt;KafkaStream&gt;&gt; createMessageStreams(Map&lt;String,Int&gt; topicCountMap); 
+
+  /**
+   * You can also obtain a list of KafkaStreams, that iterate over messages
+   * from topics that match a TopicFilter. (A TopicFilter encapsulates a
+   * whitelist or a blacklist which is a standard Java regex.)
+   */
+  public List&lt;KafkaStream&gt; createMessageStreamsByFilter(
+      TopicFilter topicFilter, int numStreams);
+
+  /* Commit the offsets of all messages consumed so far. */
+  public commitOffsets()
+  
+  /* Shut down the connector */
+  public shutdown()
+}
+</pre>
+<p>
+This API is centered around iterators, implemented by the KafkaStream class. Each KafkaStream represents the stream of messages from one or more partitions on one or more servers. Each stream is used for single threaded processing, so the client can provide the number of desired streams in the create call. Thus a stream may represent the merging of multiple server partitions (to correspond to the number of processing threads), but each partition only goes to one stream.
+</p>
+<p>
+The createMessageStreams call registers the consumer for the topic, which results in rebalancing the consumer/broker assignment. The API encourages creating many topic streams in a single call in order to minimize this rebalancing. The createMessageStreamsByFilter call (additionally) registers watchers to discover new topics that match its filter. Note that each stream that createMessageStreamsByFilter returns may iterate over messages from multiple topics (i.e., if multiple topics are allowed by the filter).
+</p>
+
+<h3><a id="networklayer">5.2 Network Layer</a></h3>
+<p>
+The network layer is a fairly straight-forward NIO server, and will not be described in great detail. The sendfile implementation is done by giving the <code>MessageSet</code> interface a <code>writeTo</code> method. This allows the file-backed message set to use the more efficient <code>transferTo</code> implementation instead of an in-process buffered write. The threading model is a single acceptor thread and <i>N</i> processor threads which handle a fixed number of connections each. This design has been pretty thoroughly tested <a href="http://sna-projects.com/blog/2009/08/introducing-the-nio-socketserver-implementation">elsewhere</a> and found to be simple to implement and fast. The protocol is kept quite simple to allow for future implementation of clients in other languages.
+</p>
+<h3><a id="messages">5.3 Messages</a></h3>
+<p>
+Messages consist of a fixed-size header and variable length opaque byte array payload. The header contains a format version and a CRC32 checksum to detect corruption or truncation. Leaving the payload opaque is the right decision: there is a great deal of progress being made on serialization libraries right now, and any particular choice is unlikely to be right for all uses. Needless to say a particular application using Kafka would likely mandate a particular serialization type as part of its usage. The <code>MessageSet</code> interface is simply an iterator over messages with specialized methods for bulk reading and writing to an NIO <code>Channel</code>.
+
+<h3><a id="messageformat">5.4 Message Format</a></h3>
+
+<pre>
+	/** 
+	 * A message. The format of an N byte message is the following: 
+	 * 
+	 * If magic byte is 0 
+	 * 
+	 * 1. 1 byte "magic" identifier to allow format changes 
+	 * 
+	 * 2. 4 byte CRC32 of the payload 
+	 * 
+	 * 3. N - 5 byte payload 
+	 * 
+	 * If magic byte is 1 
+	 * 
+	 * 1. 1 byte "magic" identifier to allow format changes 
+	 * 
+	 * 2. 1 byte "attributes" identifier to allow annotations on the message independent of the version (e.g. compression enabled, type of codec used) 
+	 * 
+	 * 3. 4 byte CRC32 of the payload 
+	 * 
+	 * 4. N - 6 byte payload 
+	 * 
+	 */
+</pre>
+</p>
+<h3><a id="log">5.5 Log</a></h3>
+<p>
+A log for a topic named "my_topic" with two partitions consists of two directories (namely <code>my_topic_0</code> and <code>my_topic_1</code>) populated with data files containing the messages for that topic. The format of the log files is a sequence of "log entries""; each log entry is a 4 byte integer <i>N</i> storing the message length which is followed by the <i>N</i> message bytes. Each message is uniquely identified by a 64-bit integer <i>offset</i> giving the byte position of the start of this message in the stream of all messages ever sent to that topic on that partition. The on-disk format of each message is given below. Each log file is named with the offset of the first message it contains. So the first file created will be 00000000000.kafka, and each additional file will have an integer name roughly <i>S</i> bytes from the previous file where <i>S</i> is the max log file size given in the configuration.
+</p>
+<p>
+The exact binary format for messages is versioned and maintained as a standard interface so message sets can be transfered between producer, broker, and client without recopying or conversion when desirable. This format is as follows:
+</p>
+<pre>
+On-disk format of a message
+
+message length : 4 bytes (value: 1+4+n) 
+"magic" value  : 1 byte
+crc            : 4 bytes
+payload        : n bytes
+</pre>
+<p>
+The use of the message offset as the message id is unusual. Our original idea was to use a GUID generated by the producer, and maintain a mapping from GUID to offset on each broker. But since a consumer must maintain an ID for each server, the global uniqueness of the GUID provides no value. Furthermore the complexity of maintaining the mapping from a random id to an offset requires a heavy weight index structure which must be synchronized with disk, essentially requiring a full persistent random-access data structure. Thus to simplify the lookup structure we decided to use a simple per-partition atomic counter which could be coupled with the partition id and node id to uniquely identify a message; this makes the lookup structure simpler, though multiple seeks per consumer request are still likely. However once we settled on a counter, the jump to directly using the offset seemed natural&mdash;both after all are monotonically increasing integers unique to a partition. Since the offs
 et is hidden from the consumer API this decision is ultimately an implementation detail and we went with the more efficient approach.
+</p>
+<img src="../images/kafka_log.png">
+<h4>Writes</h4>
+<p>
+The log allows serial appends which always go to the last file. This file is rolled over to a fresh file when it reaches a configurable size (say 1GB). The log takes two configuration parameter <i>M</i> which gives the number of messages to write before forcing the OS to flush the file to disk, and <i>S</i> which gives a number of seconds after which a flush is forced. This gives a durability guarantee of losing at most <i>M</i> messages or <i>S</i> seconds of data in the event of a system crash.
+</p>
+<h4>Reads</h4>
+<p>
+Reads are done by giving the 64-bit logical offset of a message and an <i>S</i>-byte max chunk size. This will return an iterator over the messages contained in the <i>S</i>-byte buffer. <i>S</i> is intended to be larger than any single message, but in the event of an abnormally large message, the read can be retried multiple times, each time doubling the buffer size, until the message is read successfully. A maximum message and buffer size can be specified to make the server reject messages larger than some size, and to give a bound to the client on the maximum it need ever read to get a complete message. It is likely that the read buffer ends with a partial message, this is easily detected by the size delimiting.
+</p>
+<p>
+The actual process of reading from an offset requires first locating the log segment file in which the data is stored, calculating the file-specific offset from the global offset value, and then reading from that file offset. The search is done as a simple binary search variation against an in-memory range maintained for each file.
+</p>
+<p>
+The log provides the capability of getting the most recently written message to allow clients to start subscribing as of "right now". This is also useful in the case the consumer fails to consume its data within its SLA-specified number of days. In this case when the client attempts to consume a non-existant offset it is given an OutOfRangeException and can either reset itself or fail as appropriate to the use case.
+</p>
+
+<p> The following is the format of the results sent to the consumer.
+
+<pre>
+MessageSetSend (fetch result)
+
+total length     : 4 bytes
+error code       : 2 bytes
+message 1        : x bytes
+...
+message n        : x bytes
+</pre>
+
+<pre>
+MultiMessageSetSend (multiFetch result)
+
+total length       : 4 bytes
+error code         : 2 bytes
+messageSetSend 1
+...
+messageSetSend n
+</pre>
+
+<h4>Deletes</h4>
+<p>
+Data is deleted one log segment at a time. The log manager allows pluggable delete policies to choose which files are eligible for deletion. The current policy deletes any log with a modification time of more than <i>N</i> days ago, though a policy which retained the last <i>N</i> GB could also be useful. To avoid locking reads while still allowing deletes that modify the segment list we use a copy-on-write style segment list implementation that provides consistent views to allow a binary search to proceed on an immutable static snapshot view of the log segments while deletes are progressing.
+</p>
+<h4>Guarantees</h4>
+<p>
+The log provides a configuration parameter <i>M</i> which controls the maximum number of messages that are written before forcing a flush to disk. On startup a log recovery process is run that iterates over all messages in the newest log segment and verifies that each message entry is valid. A message entry is valid if the sum of its size and offset are less than the length of the file AND the CRC32 of the message payload matches the CRC stored with the message. In the event corruption is detected the log is truncated to the last valid offset.
+</p>
+<p>
+Note that two kinds of corruption must be handled: truncation in which an unwritten block is lost due to a crash, and corruption in which a nonsense block is ADDED to the file. The reason for this is that in general the OS makes no guarantee of the write order between the file inode and the actual block data so in addition to losing written data the file can gain nonsense data if the inode is updated with a new size but a crash occurs before the block containing that data is not written. The CRC detects this corner case, and prevents it from corrupting the log (though the unwritten messages are, of course, lost).
+</p>
+
+<h3><a id="distributionimpl">5.6 Distribution</a></h3>
+<h4>Consumer Offset Tracking</h4>
+<p>
+The high-level consumer tracks the maximum offset it has consumed in each partition and periodically commits its offset vector so that it can resume from those offsets in the event of a restart. Kafka provides the option to store all the offsets for a given consumer group in a designated broker (for that group) called the <i>offset manager</i>. i.e., any consumer instance in that consumer group should send its offset commits and fetches to that offset manager (broker). The high-level consumer handles this automatically. If you use the simple consumer you will need to manage offsets manually. This is currently unsupported in the Java simple consumer which can only commit or fetch offsets in ZooKeeper. If you use the Scala simple consumer you can discover the offset manager and explicitly commit or fetch offsets to the offset manager. A consumer can look up its offset manager by issuing a ConsumerMetadataRequest to any Kafka broker and reading the ConsumerMetadataResponse which will c
 ontain the offset manager. The consumer can then proceed to commit or fetch offsets from the offsets manager broker. In case the offset manager moves, the consumer will need to rediscover the offset manager. If you wish to manage your offsets manually, you can take a look at these <a href="https://cwiki.apache.org/confluence/display/KAFKA/Committing+and+fetching+consumer+offsets+in+Kafka">code samples that explain how to issue OffsetCommitRequest and OffsetFetchRequest</a>.
+</p>
+
+<p>
+When the offset manager receives an OffsetCommitRequest, it appends the request to a special <a href="#compaction">compacted</a> Kafka topic named <i>__consumer_offsets</i>. The offset manager sends a successful offset commit response to the consumer only after all the replicas of the offsets topic receive the offsets. In case the offsets fail to replicate within a configurable timeout, the offset commit will fail and the consumer may retry the commit after backing off. (This is done automatically by the high-level consumer.) The brokers periodically compact the offsets topic since it only needs to maintain the most recent offset commit per partition. The offset manager also caches the offsets in an in-memory table in order to serve offset fetches quickly.
+</p>
+
+<p>
+When the offset manager receives an offset fetch request, it simply returns the last committed offset vector from the offsets cache. In case the offset manager was just started or if it just became the offset manager for a new set of consumer groups (by becoming a leader for a partition of the offsets topic), it may need to load the offsets topic partition into the cache. In this case, the offset fetch will fail with an OffsetsLoadInProgress exception and the consumer may retry the OffsetFetchRequest after backing off. (This is done automatically by the high-level consumer.)
+</p>
+
+<h5><a id="offsetmigration">Migrating offsets from ZooKeeper to Kafka</a></h5>
+<p>
+Kafka consumers in earlier releases store their offsets by default in ZooKeeper. It is possible to migrate these consumers to commit offsets into Kafka by following these steps:
+<ol>
+   <li>Set <code>offsets.storage=kafka</code> and <code>dual.commit.enabled=true</code> in your consumer config.
+   </li>
+   <li>Do a rolling bounce of your consumers and then verify that your consumers are healthy.
+   </li>
+   <li>Set <code>dual.commit.enabled=false</code> in your consumer config.
+   </li>
+   <li>Do a rolling bounce of your consumers and then verify that your consumers are healthy.
+   </li>
+</ol>
+A roll-back (i.e., migrating from Kafka back to ZooKeeper) can also be performed using the above steps if you set <code>offsets.storage=zookeeper</code>.
+</p>
+
+<h4>ZooKeeper Directories</h4>
+<p>
+The following gives the ZooKeeper structures and algorithms used for co-ordination between consumers and brokers.
+</p>
+
+<h4>Notation</h4>
+<p>
+When an element in a path is denoted [xyz], that means that the value of xyz is not fixed and there is in fact a ZooKeeper znode for each possible value of xyz. For example /topics/[topic] would be a directory named /topics containing a sub-directory for each topic name. Numerical ranges are also given such as [0...5] to indicate the subdirectories 0, 1, 2, 3, 4. An arrow -> is used to indicate the contents of a znode. For example /hello -> world would indicate a znode /hello containing the value "world".
+</p>
+
+<h4>Broker Node Registry</h4>
+<pre>
+/brokers/ids/[0...N] --> host:port (ephemeral node)
+</pre>
+<p>
+This is a list of all present broker nodes, each of which provides a unique logical broker id which identifies it to consumers (which must be given as part of its configuration). On startup, a broker node registers itself by creating a znode with the logical broker id under /brokers/ids. The purpose of the logical broker id is to allow a broker to be moved to a different physical machine without affecting consumers. An attempt to register a broker id that is already in use (say because two servers are configured with the same broker id) is an error.
+</p>
+<p>
+Since the broker registers itself in ZooKeeper using ephemeral znodes, this registration is dynamic and will disappear if the broker is shutdown or dies (thus notifying consumers it is no longer available).	
+</p>
+<h4>Broker Topic Registry</h4>
+<pre>
+/brokers/topics/[topic]/[0...N] --> nPartions (ephemeral node)
+</pre>
+
+<p>
+Each broker registers itself under the topics it maintains and stores the number of partitions for that topic.
+</p>
+
+<h4>Consumers and Consumer Groups</h4>
+<p>
+Consumers of topics also register themselves in ZooKeeper, in order to coordinate with each other and balance the consumption of data. Consumers can also store their offsets in ZooKeeper by setting <code>offsets.storage=zookeeper</code>. However, this offset storage mechanism will be deprecated in a future release. Therefore, it is recommended to <a href="#offsetmigration">migrate offsets storage to Kafka</a>.
+</p>
+
+<p>
+Multiple consumers can form a group and jointly consume a single topic. Each consumer in the same group is given a shared group_id. 
+For example if one consumer is your foobar process, which is run across three machines, then you might assign this group of consumers the id "foobar". This group id is provided in the configuration of the consumer, and is your way to tell the consumer which group it belongs to.
+</p>
+
+<p>
+The consumers in a group divide up the partitions as fairly as possible, each partition is consumed by exactly one consumer in a consumer group.
+</p>
+
+<h4>Consumer Id Registry</h4>
+<p>
+In addition to the group_id which is shared by all consumers in a group, each consumer is given a transient, unique consumer_id (of the form hostname:uuid) for identification purposes. Consumer ids are registered in the following directory.
+<pre>
+/consumers/[group_id]/ids/[consumer_id] --> {"topic1": #streams, ..., "topicN": #streams} (ephemeral node)
+</pre>
+Each of the consumers in the group registers under its group and creates a znode with its consumer_id. The value of the znode contains a map of &lt;topic, #streams&gt;. This id is simply used to identify each of the consumers which is currently active within a group. This is an ephemeral node so it will disappear if the consumer process dies.
+</p>
+
+<h4>Consumer Offsets</h4>
+<p>
+Consumers track the maximum offset they have consumed in each partition. This value is stored in a ZooKeeper directory if <code>offsets.storage=zookeeper</code>. This valued is stored in a ZooKeeper directory.
+</p>
+<pre>
+/consumers/[group_id]/offsets/[topic]/[broker_id-partition_id] --> offset_counter_value ((persistent node)
+</pre>
+
+<h4>Partition Owner registry</h4>
+
+<p>
+Each broker partition is consumed by a single consumer within a given consumer group. The consumer must establish its ownership of a given partition before any consumption can begin. To establish its ownership, a consumer writes its own id in an ephemeral node under the particular broker partition it is claiming.
+</p>
+
+<pre>
+/consumers/[group_id]/owners/[topic]/[broker_id-partition_id] --> consumer_node_id (ephemeral node)
+</pre>
+
+<h4>Broker node registration</h4>
+
+<p>
+The broker nodes are basically independent, so they only publish information about what they have. When a broker joins, it registers itself under the broker node registry directory and writes information about its host name and port. The broker also register the list of existing topics and their logical partitions in the broker topic registry. New topics are registered dynamically when they are created on the broker.
+</p>
+
+<h4>Consumer registration algorithm</h4>
+
+<p>
+When a consumer starts, it does the following:
+<ol>
+   <li> Register itself in the consumer id registry under its group.
+   </li>
+   <li> Register a watch on changes (new consumers joining or any existing consumers leaving) under the consumer id registry. (Each change triggers rebalancing among all consumers within the group to which the changed consumer belongs.)
+   </li>
+   <li> Register a watch on changes (new brokers joining or any existing brokers leaving) under the broker id registry. (Each change triggers rebalancing among all consumers in all consumer groups.) </li>
+   <li> If the consumer creates a message stream using a topic filter, it also registers a watch on changes (new topics being added) under the broker topic registry. (Each change will trigger re-evaluation of the available topics to determine which topics are allowed by the topic filter. A new allowed topic will trigger rebalancing among all consumers within the consumer group.)</li>
+   <li> Force itself to rebalance within in its consumer group.
+   </li>
+</ol>
+</p>
+
+<h4>Consumer rebalancing algorithm</h4>
+<p>
+The consumer rebalancing algorithms allows all the consumers in a group to come into consensus on which consumer is consuming which partitions. Consumer rebalancing is triggered on each addition or removal of both broker nodes and other consumers within the same group. For a given topic and a given consumer group, broker partitions are divided evenly among consumers within the group. A partition is always consumed by a single consumer. This design simplifies the implementation. Had we allowed a partition to be concurrently consumed by multiple consumers, there would be contention on the partition and some kind of locking would be required. If there are more consumers than partitions, some consumers won't get any data at all. During rebalancing, we try to assign partitions to consumers in such a way that reduces the number of broker nodes each consumer has to connect to.
+</p>
+<p>
+Each consumer does the following during rebalancing:
+</p>
+<pre>
+   1. For each topic T that C<sub>i</sub> subscribes to 
+   2.   let P<sub>T</sub> be all partitions producing topic T
+   3.   let C<sub>G</sub> be all consumers in the same group as C<sub>i</sub> that consume topic T
+   4.   sort P<sub>T</sub> (so partitions on the same broker are clustered together)
+   5.   sort C<sub>G</sub>
+   6.   let i be the index position of C<sub>i</sub> in C<sub>G</sub> and let N = size(P<sub>T</sub>)/size(C<sub>G</sub>)
+   7.   assign partitions from i*N to (i+1)*N - 1 to consumer C<sub>i</sub>
+   8.   remove current entries owned by C<sub>i</sub> from the partition owner registry
+   9.   add newly assigned partitions to the partition owner registry
+        (we may need to re-try this until the original partition owner releases its ownership)
+</pre>
+<p>
+When rebalancing is triggered at one consumer, rebalancing should be triggered in other consumers within the same group about the same time.
+</p>

http://git-wip-us.apache.org/repos/asf/kafka-site/blob/ba6c994c/082/introduction.html
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+<h3><a id="introduction">1.1 Introduction</a></h3>
+Kafka is a distributed, partitioned, replicated commit log service. It provides the functionality of a messaging system, but with a unique design.
+<p>
+What does all that mean?
+<p>
+First let's review some basic messaging terminology:
+<ul>
+    <li>Kafka maintains feeds of messages in categories called <i>topics</i>.
+    <li>We'll call processes that publish messages to a Kafka topic <i>producers</i>.
+    <li>We'll call processes that subscribe to topics and process the feed of published messages <i>consumers</i>..
+    <li>Kafka is run as a cluster comprised of one or more servers each of which is called a <i>broker</i>.
+</ul>
+
+So, at a high level, producers send messages over the network to the Kafka cluster which in turn serves them up to consumers like this:
+<div style="text-align: center; width: 100%">
+  <img src="../images/producer_consumer.png">
+</div>
+
+Communication between the clients and the servers is done with a simple, high-performance, language agnostic <a href="https://cwiki.apache.org/confluence/display/KAFKA/A+Guide+To+The+Kafka+Protocol">TCP protocol</a>. We provide a Java client for Kafka, but clients are available in <a href="https://cwiki.apache.org/confluence/display/KAFKA/Clients">many languages</a>.
+
+<h4>Topics and Logs</h4>
+Let's first dive into the high-level abstraction Kafka provides&mdash;the topic.
+<p>
+A topic is a category or feed name to which messages are published. For each topic, the Kafka cluster maintains a partitioned log that looks like this:
+<div style="text-align: center; width: 100%">
+  <img src="../images/log_anatomy.png">
+</div>
+Each partition is an ordered, immutable sequence of messages that is continually appended to&mdash;a commit log. The messages in the partitions are each assigned a sequential id number called the <i>offset</i> that uniquely identifies each message within the partition.
+<p>
+The Kafka cluster retains all published messages&mdash;whether or not they have been consumed&mdash;for a configurable period of time. For example if the log retention is set to two days, then for the two days after a message is published it is available for consumption, after which it will be discarded to free up space. Kafka's performance is effectively constant with respect to data size so retaining lots of data is not a problem.
+<p>
+In fact the only metadata retained on a per-consumer basis is the position of the consumer in the log, called the "offset". This offset is controlled by the consumer: normally a consumer will advance its offset linearly as it reads messages, but in fact the position is controlled by the consumer and it can consume messages in any order it likes. For example a consumer can reset to an older offset to reprocess.
+<p>
+This combination of features means that Kafka consumers are very cheap&mdash;they can come and go without much impact on the cluster or on other consumers. For example, you can use our command line tools to "tail" the contents of any topic without changing what is consumed by any existing consumers.
+<p>
+The partitions in the log serve several purposes. First, they allow the log to scale beyond a size that will fit on a single server. Each individual partition must fit on the servers that host it, but a topic may have many partitions so it can handle an arbitrary amount of data. Second they act as the unit of parallelism&mdash;more on that in a bit. 
+
+<h4>Distribution</h4>
+
+The partitions of the log are distributed over the servers in the Kafka cluster with each server handling data and requests for a share of the partitions. Each partition is replicated across a configurable number of servers for fault tolerance.
+<p>
+Each partition has one server which acts as the "leader" and zero or more servers which act as "followers". The leader handles all read and write requests for the partition while the followers passively replicate the leader. If the leader fails, one of the followers will automatically become the new leader. Each server acts as a leader for some of its partitions and a follower for others so load is well balanced within the cluster.
+
+<h4>Producers</h4>
+
+Producers publish data to the topics of their choice. The producer is responsible for choosing which message to assign to which partition within the topic. This can be done in a round-robin fashion simply to balance load or it can be done according to some semantic partition function (say based on some key in the message). More on the use of partitioning in a second.
+
+<h4><a id="intro_consumers">Consumers</a></h4>
+
+Messaging traditionally has two models: <a href="http://en.wikipedia.org/wiki/Message_queue">queuing</a> and <a href="http://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern">publish-subscribe</a>. In a queue, a pool of consumers may read from a server and each message goes to one of them; in publish-subscribe the message is broadcast to all consumers. Kafka offers a single consumer abstraction that generalizes both of these&mdash;the <i>consumer group</i>.
+<p>
+Consumers label themselves with a consumer group name, and each message published to a topic is delivered to one consumer instance within each subscribing consumer group. Consumer instances can be in separate processes or on separate machines.
+<p>
+If all the consumer instances have the same consumer group, then this works just like a traditional queue balancing load over the consumers.
+<p>
+If all the consumer instances have different consumer groups, then this works like publish-subscribe and all messages are broadcast to all consumers. 
+<p>
+More commonly, however, we have found that topics have a small number of consumer groups, one for each "logical subscriber". Each group is composed of many consumer instances for scalability and fault tolerance. This is nothing more than publish-subscribe semantics where the subscriber is cluster of consumers instead of a single process.
+<p>
+
+<div style="float: right; margin: 20px; width: 500px" class="caption">
+  <img src="../images/consumer-groups.png"><br>
+  A two server Kafka cluster hosting four partitions (P0-P3) with two consumer groups. Consumer group A has two consumer instances and group B has four.
+</div>
+<p>
+Kafka has stronger ordering guarantees than a traditional messaging system, too.
+<p>
+A traditional queue retains messages in-order on the server, and if multiple consumers consume from the queue then the server hands out messages in the order they are stored. However, although the server hands out messages in order, the messages are delivered asynchronously to consumers, so they may arrive out of order on different consumers. This effectively means the ordering of the messages is lost in the presence of parallel consumption. Messaging systems often work around this by having a notion of "exclusive consumer" that allows only one process to consume from a queue, but of course this means that there is no parallelism in processing.
+<p>
+Kafka does it better. By having a notion of parallelism&mdash;the partition&mdash;within the topics, Kafka is able to provide both ordering guarantees and load balancing over a pool of consumer processes. This is achieved by assigning the partitions in the topic to the consumers in the consumer group so that each partition is consumed by exactly one consumer in the group. By doing this we ensure that the consumer is the only reader of that partition and consumes the data in order. Since there are many partitions this still balances the load over many consumer instances. Note however that there cannot be more consumer instances than partitions.
+<p>
+Kafka only provides a total order over messages <i>within</i> a partition, not between different partitions in a topic. Per-partition ordering combined with the ability to partition data by key is sufficient for most applications. However, if you require a total order over messages this can be achieved with a topic that has only one partition, though this will mean only one consumer process.
+
+<h4>Guarantees</h4>
+
+At a high-level Kafka gives the following guarantees:
+<ul>
+  <li>Messages sent by a producer to a particular topic partition will be appended in the order they are sent. That is, if a message M1 is sent by the same producer as a message M2, and M1 is sent first, then M1 will have a lower offset than M2 and appear earlier in the log.
+  <li>A consumer instance sees messages in the order they are stored in the log.
+  <li>For a topic with replication factor N, we will tolerate up to N-1 server failures without losing any messages committed to the log.
+</ul>
+More details on these guarantees are given in the design section of the documentation.

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+<A HREF="org/apache/kafka/clients/producer/RecordMetadata.html" title="class in org.apache.kafka.clients.producer" target="classFrame">RecordMetadata</A>
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+<BR>
+<A HREF="org/apache/kafka/common/serialization/Serializer.html" title="interface in org.apache.kafka.common.serialization" target="classFrame"><I>Serializer</I></A>
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+<BR>
+<A HREF="org/apache/kafka/common/errors/TimeoutException.html" title="class in org.apache.kafka.common.errors" target="classFrame">TimeoutException</A>
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+  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A>&nbsp;</TD>
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+<H1>
+Constant Field Values</H1>
+</CENTER>
+<HR SIZE="4" NOSHADE>
+<B>Contents</B><UL>
+<LI><A HREF="#org.apache">org.apache.*</A>
+</UL>
+
+<A NAME="org.apache"><!-- --></A>
+<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
+<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
+<TH ALIGN="left"><FONT SIZE="+2">
+org.apache.*</FONT></TH>
+</TR>
+</TABLE>
+
+<P>
+
+<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
+<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
+<TH ALIGN="left" COLSPAN="3">org.apache.kafka.clients.producer.<A HREF="org/apache/kafka/clients/producer/ProducerConfig.html" title="class in org.apache.kafka.clients.producer">ProducerConfig</A></TH>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.ACKS_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#ACKS_CONFIG">ACKS_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"acks"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.BATCH_SIZE_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#BATCH_SIZE_CONFIG">BATCH_SIZE_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"batch.size"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.BLOCK_ON_BUFFER_FULL_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#BLOCK_ON_BUFFER_FULL_CONFIG">BLOCK_ON_BUFFER_FULL_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"block.on.buffer.full"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.BOOTSTRAP_SERVERS_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#BOOTSTRAP_SERVERS_CONFIG">BOOTSTRAP_SERVERS_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"bootstrap.servers"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.BUFFER_MEMORY_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#BUFFER_MEMORY_CONFIG">BUFFER_MEMORY_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"buffer.memory"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.CLIENT_ID_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#CLIENT_ID_CONFIG">CLIENT_ID_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"client.id"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.COMPRESSION_TYPE_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#COMPRESSION_TYPE_CONFIG">COMPRESSION_TYPE_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"compression.type"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#KEY_SERIALIZER_CLASS_CONFIG">KEY_SERIALIZER_CLASS_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"key.serializer"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.LINGER_MS_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#LINGER_MS_CONFIG">LINGER_MS_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"linger.ms"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION">MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION</A></CODE></TD>
+<TD ALIGN="right"><CODE>"max.in.flight.requests.per.connection"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.MAX_REQUEST_SIZE_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#MAX_REQUEST_SIZE_CONFIG">MAX_REQUEST_SIZE_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"max.request.size"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.METADATA_FETCH_TIMEOUT_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#METADATA_FETCH_TIMEOUT_CONFIG">METADATA_FETCH_TIMEOUT_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"metadata.fetch.timeout.ms"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.METADATA_MAX_AGE_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#METADATA_MAX_AGE_CONFIG">METADATA_MAX_AGE_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"metadata.max.age.ms"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.METRIC_REPORTER_CLASSES_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#METRIC_REPORTER_CLASSES_CONFIG">METRIC_REPORTER_CLASSES_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"metric.reporters"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.METRICS_NUM_SAMPLES_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#METRICS_NUM_SAMPLES_CONFIG">METRICS_NUM_SAMPLES_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"metrics.num.samples"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.METRICS_SAMPLE_WINDOW_MS_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#METRICS_SAMPLE_WINDOW_MS_CONFIG">METRICS_SAMPLE_WINDOW_MS_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"metrics.sample.window.ms"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.RECEIVE_BUFFER_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#RECEIVE_BUFFER_CONFIG">RECEIVE_BUFFER_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"receive.buffer.bytes"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.RECONNECT_BACKOFF_MS_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#RECONNECT_BACKOFF_MS_CONFIG">RECONNECT_BACKOFF_MS_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"reconnect.backoff.ms"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.RETRIES_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#RETRIES_CONFIG">RETRIES_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"retries"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.RETRY_BACKOFF_MS_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#RETRY_BACKOFF_MS_CONFIG">RETRY_BACKOFF_MS_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"retry.backoff.ms"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.SEND_BUFFER_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#SEND_BUFFER_CONFIG">SEND_BUFFER_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"send.buffer.bytes"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.TIMEOUT_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#TIMEOUT_CONFIG">TIMEOUT_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"timeout.ms"</CODE></TD>
+</TR>
+<TR BGCOLOR="white" CLASS="TableRowColor">
+<A NAME="org.apache.kafka.clients.producer.ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG"><!-- --></A><TD ALIGN="right"><FONT SIZE="-1">
+<CODE>public&nbsp;static&nbsp;final&nbsp;java.lang.String</CODE></FONT></TD>
+<TD ALIGN="left"><CODE><A HREF="org/apache/kafka/clients/producer/ProducerConfig.html#VALUE_SERIALIZER_CLASS_CONFIG">VALUE_SERIALIZER_CLASS_CONFIG</A></CODE></TD>
+<TD ALIGN="right"><CODE>"value.serializer"</CODE></TD>
+</TR>
+</FONT></TD>
+</TR>
+</TABLE>
+
+<P>
+
+<P>
+<HR>
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+
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http://git-wip-us.apache.org/repos/asf/kafka-site/blob/ba6c994c/082/javadoc/help-doc.html
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<!--NewPage-->
+<HTML>
+<HEAD>
+<!-- Generated by javadoc (build 1.6.0_65) on Wed Jan 28 22:31:45 CST 2015 -->
+<TITLE>
+API Help (clients 0.8.2.0 API)
+</TITLE>
+
+<META NAME="date" CONTENT="2015-01-28">
+
+<LINK REL ="stylesheet" TYPE="text/css" HREF="stylesheet.css" TITLE="Style">
+
+<SCRIPT type="text/javascript">
+function windowTitle()
+{
+    if (location.href.indexOf('is-external=true') == -1) {
+        parent.document.title="API Help (clients 0.8.2.0 API)";
+    }
+}
+</SCRIPT>
+<NOSCRIPT>
+</NOSCRIPT>
+
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+
+<BODY BGCOLOR="white" onload="windowTitle();">
+<HR>
+
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+<!-- ========= START OF TOP NAVBAR ======= -->
+<A NAME="navbar_top"><!-- --></A>
+<A HREF="#skip-navbar_top" title="Skip navigation links"></A>
+<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY="">
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+<A NAME="navbar_top_firstrow"><!-- --></A>
+<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">
+  <TR ALIGN="center" VALIGN="top">
+  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
+  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <FONT CLASS="NavBarFont1">Package</FONT>&nbsp;</TD>
+  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <FONT CLASS="NavBarFont1">Class</FONT>&nbsp;</TD>
+  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="overview-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
+  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>
+  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A>&nbsp;</TD>
+  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Help</B></FONT>&nbsp;</TD>
+  </TR>
+</TABLE>
+</TD>
+<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
+</EM>
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+&nbsp;PREV&nbsp;
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+<H1>
+How This API Document Is Organized</H1>
+</CENTER>
+This API (Application Programming Interface) document has pages corresponding to the items in the navigation bar, described as follows.<H3>
+Overview</H3>
+<BLOCKQUOTE>
+
+<P>
+The <A HREF="overview-summary.html">Overview</A> page is the front page of this API document and provides a list of all packages with a summary for each.  This page can also contain an overall description of the set of packages.</BLOCKQUOTE>
+<H3>
+Package</H3>
+<BLOCKQUOTE>
+
+<P>
+Each package has a page that contains a list of its classes and interfaces, with a summary for each. This page can contain four categories:<UL>
+<LI>Interfaces (italic)<LI>Classes<LI>Enums<LI>Exceptions<LI>Errors<LI>Annotation Types</UL>
+</BLOCKQUOTE>
+<H3>
+Class/Interface</H3>
+<BLOCKQUOTE>
+
+<P>
+Each class, interface, nested class and nested interface has its own separate page. Each of these pages has three sections consisting of a class/interface description, summary tables, and detailed member descriptions:<UL>
+<LI>Class inheritance diagram<LI>Direct Subclasses<LI>All Known Subinterfaces<LI>All Known Implementing Classes<LI>Class/interface declaration<LI>Class/interface description
+<P>
+<LI>Nested Class Summary<LI>Field Summary<LI>Constructor Summary<LI>Method Summary
+<P>
+<LI>Field Detail<LI>Constructor Detail<LI>Method Detail</UL>
+Each summary entry contains the first sentence from the detailed description for that item. The summary entries are alphabetical, while the detailed descriptions are in the order they appear in the source code. This preserves the logical groupings established by the programmer.</BLOCKQUOTE>
+</BLOCKQUOTE>
+<H3>
+Annotation Type</H3>
+<BLOCKQUOTE>
+
+<P>
+Each annotation type has its own separate page with the following sections:<UL>
+<LI>Annotation Type declaration<LI>Annotation Type description<LI>Required Element Summary<LI>Optional Element Summary<LI>Element Detail</UL>
+</BLOCKQUOTE>
+</BLOCKQUOTE>
+<H3>
+Enum</H3>
+<BLOCKQUOTE>
+
+<P>
+Each enum has its own separate page with the following sections:<UL>
+<LI>Enum declaration<LI>Enum description<LI>Enum Constant Summary<LI>Enum Constant Detail</UL>
+</BLOCKQUOTE>
+<H3>
+Tree (Class Hierarchy)</H3>
+<BLOCKQUOTE>
+There is a <A HREF="overview-tree.html">Class Hierarchy</A> page for all packages, plus a hierarchy for each package. Each hierarchy page contains a list of classes and a list of interfaces. The classes are organized by inheritance structure starting with <code>java.lang.Object</code>. The interfaces do not inherit from <code>java.lang.Object</code>.<UL>
+<LI>When viewing the Overview page, clicking on "Tree" displays the hierarchy for all packages.<LI>When viewing a particular package, class or interface page, clicking "Tree" displays the hierarchy for only that package.</UL>
+</BLOCKQUOTE>
+<H3>
+Deprecated API</H3>
+<BLOCKQUOTE>
+The <A HREF="deprecated-list.html">Deprecated API</A> page lists all of the API that have been deprecated. A deprecated API is not recommended for use, generally due to improvements, and a replacement API is usually given. Deprecated APIs may be removed in future implementations.</BLOCKQUOTE>
+<H3>
+Index</H3>
+<BLOCKQUOTE>
+The <A HREF="index-all.html">Index</A> contains an alphabetic list of all classes, interfaces, constructors, methods, and fields.</BLOCKQUOTE>
+<H3>
+Prev/Next</H3>
+These links take you to the next or previous class, interface, package, or related page.<H3>
+Frames/No Frames</H3>
+These links show and hide the HTML frames.  All pages are available with or without frames.
+<P>
+<H3>
+Serialized Form</H3>
+Each serializable or externalizable class has a description of its serialization fields and methods. This information is of interest to re-implementors, not to developers using the API. While there is no link in the navigation bar, you can get to this information by going to any serialized class and clicking "Serialized Form" in the "See also" section of the class description.
+<P>
+<H3>
+Constant Field Values</H3>
+The <a href="constant-values.html">Constant Field Values</a> page lists the static final fields and their values.
+<P>
+<FONT SIZE="-1">
+<EM>
+This help file applies to API documentation generated using the standard doclet.</EM>
+</FONT>
+<BR>
+<HR>
+
+
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+  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Help</B></FONT>&nbsp;</TD>
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