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<div><h1 class="title"><a id="id-1"></a>Configure the Kafka output</h1><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
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<strong>IMPORTANT</strong>: This documentation is no longer updated. Refer to <a href="https://www.elastic.co/support/eol">Elastic's version policy</a> and the <a href="https://www.elastic.co/docs">latest documentation</a>.
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<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h2 class="title"><a id="kafka-output"></a>Configure the Kafka output</h2><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
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<p>The Kafka output sends events to Apache Kafka.</p>
<p>To use this output, edit the APM Server configuration file to disable the Elasticsearch
output by commenting it out, and enable the Kafka output by uncommenting the
Kafka section.</p>
<p>Example configuration:</p>
<div class="pre_wrapper lang-yaml">
<div class="console_code_copy" title="Copy to clipboard"></div>
<pre class="programlisting prettyprint lang-yaml">output.kafka:
# initial brokers for reading cluster metadata
hosts: ["kafka1:9092", "kafka2:9092", "kafka3:9092"]
# message topic selection + partitioning
topic: '%{[fields.log_topic]}'
partition.round_robin:
reachable_only: false
required_acks: 1
compression: gzip
max_message_bytes: 1000000</pre>
</div>
<div class="note admon">
<div class="icon"></div>
<div class="admon_content">
<p>Events bigger than <a class="xref" href="kafka-output.html#kafka-max_message_bytes" title="max_message_bytes"><code class="literal">max_message_bytes</code></a> will be dropped. To avoid this problem, make sure APM Server does not generate events bigger than <a class="xref" href="kafka-output.html#kafka-max_message_bytes" title="max_message_bytes"><code class="literal">max_message_bytes</code></a>.</p>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h3 class="title"><a id="kafka-compatibility"></a>Compatibility</h3><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>This output works with all Kafka versions in between 0.11 and 2.2.2. Older versions
might work as well, but are not supported.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h3 class="title"><a id="_configuration_options_6"></a>Configuration options</h3><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>You can specify the following options in the <code class="literal">kafka</code> section of the <code class="literal">apm-server.yml</code> config file:</p>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_enabled_5"></a><code class="literal">enabled</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The <code class="literal">enabled</code> config is a boolean setting to enable or disable the output. If set
to false, the output is disabled.</p>
<p>The default value is <code class="literal">false</code>.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_hosts_2"></a><code class="literal">hosts</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The list of Kafka broker addresses from where to fetch the cluster metadata.
The cluster metadata contain the actual Kafka brokers events are published to.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_version"></a><code class="literal">version</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>Kafka version apm-server is assumed to run against. Defaults to 1.0.0.</p>
<p>Event timestamps will be added, if version 0.10.0.0+ is enabled.</p>
<p>Valid values are all kafka releases in between <code class="literal">0.8.2.0</code> and <code class="literal">2.0.0</code>.</p>
<p>See <a class="xref" href="kafka-output.html#kafka-compatibility" title="Compatibility">Compatibility</a> for information on supported versions.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_username_3"></a><code class="literal">username</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The username for connecting to Kafka. If username is configured, the password
must be configured as well.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_password_3"></a><code class="literal">password</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The password for connecting to Kafka.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_sasl_mechanism"></a><code class="literal">sasl.mechanism</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<div class="warning admon">
<div class="icon"></div>
<div class="admon_content">
<p>This functionality is in beta and is subject to change. The design and code is less mature than official GA features and is being provided as-is with no warranties. Beta features are not subject to the support SLA of official GA features.</p>
</div>
</div>
<p>The SASL mechanism to use when connecting to Kafka. It can be one of:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<code class="literal">PLAIN</code> for SASL/PLAIN.
</li>
<li class="listitem">
<code class="literal">SCRAM-SHA-256</code> for SCRAM-SHA-256.
</li>
<li class="listitem">
<code class="literal">SCRAM-SHA-512</code> for SCRAM-SHA-512.
</li>
</ul>
</div>
<p>If <code class="literal">sasl.mechanism</code> is not set, <code class="literal">PLAIN</code> is used if <code class="literal">username</code> and <code class="literal">password</code>
are provided. Otherwise, SASL authentication is disabled.</p>
<p>To use <code class="literal">GSSAPI</code> mechanism to authenticate with Kerberos, you must leave this
field empty, and use the <a class="xref" href="kafka-output.html#kerberos-option-kafka" title="kerberos"><code class="literal">kerberos</code></a> options.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="topic-option-kafka"></a><code class="literal">topic</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The Kafka topic used for produced events.</p>
<p>You can set the topic dynamically by using a format string to access any
event field. For example, this configuration uses a custom field,
<code class="literal">fields.log_topic</code>, to set the topic for each event:</p>
<div class="pre_wrapper lang-yaml">
<div class="console_code_copy" title="Copy to clipboard"></div>
<pre class="programlisting prettyprint lang-yaml">topic: '%{[fields.log_topic]}'</pre>
</div>
<div class="tip admon">
<div class="icon"></div>
<div class="admon_content">
<p>To learn how to add custom fields to events, see the
<a class="xref" href="configuring-output.html#libbeat-configuration-fields" title="fields"><code class="literal">fields</code></a> option.</p>
</div>
</div>
<p>See the <a class="xref" href="kafka-output.html#topics-option-kafka" title="topics"><code class="literal">topics</code></a> setting for other ways to set the
topic dynamically.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="topics-option-kafka"></a><code class="literal">topics</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>An array of topic selector rules. Each rule specifies the <code class="literal">topic</code> to use for
events that match the rule. During publishing, APM Server sets the <code class="literal">topic</code>
for each event based on the first matching rule in the array. Rules
can contain conditionals, format string-based fields, and name mappings. If the
<code class="literal">topics</code> setting is missing or no rule matches, the
<a class="xref" href="kafka-output.html#topic-option-kafka" title="topic"><code class="literal">topic</code></a> field is used.</p>
<p>Rule settings:</p>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<span class="strong strong"><strong><code class="literal">topic</code></strong></span>
</span>
</dt>
<dd>
The topic format string to use. If this string contains field
references, such as <code class="literal">%{[fields.name]}</code>, the fields must exist, or the rule
fails.
</dd>
<dt>
<span class="term">
<span class="strong strong"><strong><code class="literal">mappings</code></strong></span>
</span>
</dt>
<dd>
A dictionary that takes the value returned by <code class="literal">topic</code> and maps it
to a new name.
</dd>
<dt>
<span class="term">
<span class="strong strong"><strong><code class="literal">default</code></strong></span>
</span>
</dt>
<dd>
The default string value to use if <code class="literal">mappings</code> does not find a
match.
</dd>
<dt>
<span class="term">
<span class="strong strong"><strong><code class="literal">when</code></strong></span>
</span>
</dt>
<dd>
A condition that must succeed in order to execute the current rule.
</dd>
</dl>
</div>
<p>The following example sets the topic based on whether the message field contains
the specified string:</p>
<div class="pre_wrapper lang-yaml">
<div class="console_code_copy" title="Copy to clipboard"></div>
<pre class="programlisting prettyprint lang-yaml">output.kafka:
hosts: ["localhost:9092"]
topic: "logs-%{[agent.version]}"
topics:
- topic: "critical-%{[agent.version]}"
when.contains:
message: "CRITICAL"
- topic: "error-%{[agent.version]}"
when.contains:
message: "ERR"</pre>
</div>
<p>This configuration results in topics named <code class="literal">critical-7.14.2</code>,
<code class="literal">error-7.14.2</code>, and <code class="literal">logs-7.14.2</code>.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_key"></a><code class="literal">key</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>Optional formatted string specifying the Kafka event key. If configured, the
event key can be extracted from the event using a format string.</p>
<p>See the Kafka documentation for the implications of a particular choice of key;
by default, the key is chosen by the Kafka cluster.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_partition"></a><code class="literal">partition</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>Kafka output broker event partitioning strategy. Must be one of <code class="literal">random</code>,
<code class="literal">round_robin</code>, or <code class="literal">hash</code>. By default the <code class="literal">hash</code> partitioner is used.</p>
<p><span class="strong strong"><strong><code class="literal">random.group_events</code></strong></span>: Sets the number of events to be published to the same
partition, before the partitioner selects a new partition by random. The
default value is 1 meaning after each event a new partition is picked randomly.</p>
<p><span class="strong strong"><strong><code class="literal">round_robin.group_events</code></strong></span>: Sets the number of events to be published to the
same partition, before the partitioner selects the next partition. The default
value is 1 meaning after each event the next partition will be selected.</p>
<p><span class="strong strong"><strong><code class="literal">hash.hash</code></strong></span>: List of fields used to compute the partitioning hash value from.
If no field is configured, the events <code class="literal">key</code> value will be used.</p>
<p><span class="strong strong"><strong><code class="literal">hash.random</code></strong></span>: Randomly distribute events if no hash or key value can be computed.</p>
<p>All partitioners will try to publish events to all partitions by default. If a
partition’s leader becomes unreachable for the beat, the output might block. All
partitioners support setting <code class="literal">reachable_only</code> to overwrite this
behavior. If <code class="literal">reachable_only</code> is set to <code class="literal">true</code>, events will be published to
available partitions only.</p>
<div class="note admon">
<div class="icon"></div>
<div class="admon_content">
<p>Publishing to a subset of available partitions potentially increases resource usage because events may become unevenly distributed.</p>
</div>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_client_id"></a><code class="literal">client_id</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The configurable ClientID used for logging, debugging, and auditing purposes. The default is "beats".</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_worker_3"></a><code class="literal">worker</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The number of concurrent load-balanced Kafka output workers.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_codec"></a><code class="literal">codec</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>Output codec configuration. If the <code class="literal">codec</code> section is missing, events will be json encoded.</p>
<p>See <a class="xref" href="configuration-output-codec.html" title="Change the output codec">Change the output codec</a> for more information.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_metadata"></a><code class="literal">metadata</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>Kafka metadata update settings. The metadata do contain information about
brokers, topics, partition, and active leaders to use for publishing.</p>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<span class="strong strong"><strong><code class="literal">refresh_frequency</code></strong></span>
</span>
</dt>
<dd>
Metadata refresh interval. Defaults to 10 minutes.
</dd>
<dt>
<span class="term">
<span class="strong strong"><strong><code class="literal">full</code></strong></span>
</span>
</dt>
<dd>
Strategy to use when fetching metadata, when this option is <code class="literal">true</code>, the client will maintain
a full set of metadata for all the available topics, if the this option is set to <code class="literal">false</code> it will only refresh the
metadata for the configured topics. The default is false.
</dd>
<dt>
<span class="term">
<span class="strong strong"><strong><code class="literal">retry.max</code></strong></span>
</span>
</dt>
<dd>
Total number of metadata update retries when cluster is in middle of leader election. The default is 3.
</dd>
<dt>
<span class="term">
<span class="strong strong"><strong><code class="literal">retry.backoff</code></strong></span>
</span>
</dt>
<dd>
Waiting time between retries during leader elections. Default is 250ms.
</dd>
</dl>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_max_retries_3"></a><code class="literal">max_retries</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The number of times to retry publishing an event after a publishing failure.
After the specified number of retries, the events are typically dropped.</p>
<p>Set <code class="literal">max_retries</code> to a value less than 0 to retry until all events are published.</p>
<p>The default is 3.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_backoff_init_3"></a><code class="literal">backoff.init</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The number of seconds to wait before trying to republish to Kafka
after a network error. After waiting <code class="literal">backoff.init</code> seconds, APM Server
tries to republish. If the attempt fails, the backoff timer is increased
exponentially up to <code class="literal">backoff.max</code>. After a successful publish, the backoff
timer is reset. The default is 1s.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_backoff_max_3"></a><code class="literal">backoff.max</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The maximum number of seconds to wait before attempting to republish to
Kafka after a network error. The default is 60s.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_bulk_max_size_3"></a><code class="literal">bulk_max_size</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The maximum number of events to bulk in a single Kafka request. The default is 2048.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_bulk_flush_frequency"></a><code class="literal">bulk_flush_frequency</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>Duration to wait before sending bulk Kafka request. 0 is no delay. The default is 0.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_timeout_3"></a><code class="literal">timeout</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The number of seconds to wait for responses from the Kafka brokers before timing
out. The default is 30 (seconds).</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_broker_timeout"></a><code class="literal">broker_timeout</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The maximum duration a broker will wait for number of required ACKs. The default is 10s.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_channel_buffer_size"></a><code class="literal">channel_buffer_size</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>Per Kafka broker number of messages buffered in output pipeline. The default is 256.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_keep_alive"></a><code class="literal">keep_alive</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The keep-alive period for an active network connection. If 0s, keep-alives are disabled. The default is 0 seconds.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_compression"></a><code class="literal">compression</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>Sets the output compression codec. Must be one of <code class="literal">none</code>, <code class="literal">snappy</code>, <code class="literal">lz4</code> and <code class="literal">gzip</code>. The default is <code class="literal">gzip</code>.</p>
<div class="important admon">
<div class="icon"></div>
<div class="admon_content">
<p class="admon_title">Known issue with Azure Event Hub for Kafka</p>
<p>When targeting Azure Event Hub for Kafka, set <code class="literal">compression</code> to <code class="literal">none</code> as the provided codecs are not supported.</p>
</div>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_compression_level_3"></a><code class="literal">compression_level</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>Sets the compression level used by gzip. Setting this value to 0 disables compression.
The compression level must be in the range of 1 (best speed) to 9 (best compression).</p>
<p>Increasing the compression level will reduce the network usage but will increase the cpu usage.</p>
<p>The default value is 4.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="kafka-max_message_bytes"></a><code class="literal">max_message_bytes</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The maximum permitted size of JSON-encoded messages. Bigger messages will be dropped. The default value is 1000000 (bytes). This value should be equal to or less than the broker’s <code class="literal">message.max.bytes</code>.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_required_acks"></a><code class="literal">required_acks</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>The ACK reliability level required from broker. 0=no response, 1=wait for local commit, -1=wait for all replicas to commit. The default is 1.</p>
<p>Note: If set to 0, no ACKs are returned by Kafka. Messages might be lost silently on error.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_enable_krb5_fast"></a><code class="literal">enable_krb5_fast</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<div class="warning admon">
<div class="icon"></div>
<div class="admon_content">
<p>This functionality is in beta and is subject to change. The design and code is less mature than official GA features and is being provided as-is with no warranties. Beta features are not subject to the support SLA of official GA features.</p>
</div>
</div>
<p>Enable Kerberos FAST authentication. This may conflict with some Active Directory installations. It is separate from the standard Kerberos settings because this flag only applies to the Kafka output. The default is <code class="literal">false</code>.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="_ssl_3"></a><code class="literal">ssl</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<p>Configuration options for SSL parameters like the root CA for Kafka connections.
The Kafka host keystore should be created with the
<code class="literal">-keyalg RSA</code> argument to ensure it uses a cipher supported by
<a href="https://github.com/Shopify/sarama/wiki/Frequently-Asked-Questions#why-cant-sarama-connect-to-my-kafka-cluster-using-ssl" class="ulink" target="_top">Filebeat’s Kafka library</a>.
See <a class="xref" href="configuration-ssl.html" title="SSL output settings">SSL output settings</a> for more information.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<div class="position-relative"><h4 class="title"><a id="kerberos-option-kafka"></a><code class="literal">kerberos</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.14/docs/copied-from-beats/outputs/kafka/docs/kafka.asciidoc">edit</a></div>
</div></div></div>
<div class="warning admon">
<div class="icon"></div>
<div class="admon_content">
<p>This functionality is in beta and is subject to change. The design and code is less mature than official GA features and is being provided as-is with no warranties. Beta features are not subject to the support SLA of official GA features.</p>
</div>
</div>
<p>Configuration options for Kerberos authentication.</p>
<p>See <a class="xref" href="configuration-kerberos.html" title="Configure Kerberos"><em>Kerberos</em></a> for more information.</p>
</div>
</div>
</div>
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