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Added: nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.ConsumeKafka_1_0/index.html
URL: http://svn.apache.org/viewvc/nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.ConsumeKafka_1_0/index.html?rev=1854109&view=auto
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--- nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.ConsumeKafka_1_0/index.html (added)
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>ConsumeKafka_1_0</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">ConsumeKafka_1_0</h1><h2>Description: </h2><p>Consumes messages from Apache Kafka specifically built against the Kafka 1.0 Consumer API. The complementary NiFi processor for sending messages is PublishKafka_1_0.</p><p><a href="additionalDetails.html">Additional Details...</a></p><h3>Tags: </h3><p>Kafka, Get, Ingest, Ingress, Topic, PubSub, Consume, 1.0</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property suppor
ts the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Kafka Brokers</strong></td><td id="default-value">localhost:9092</td><td id="allowable-values"></td><td id="description">A comma-separated list of known Kafka Brokers in the format <host>:<port><br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Security Protocol</strong></td><td id="default-value">PLAINTEXT</td><td id="allowable-values"><ul><li>PLAINTEXT <img src="../../../../../html/images/iconInfo.png" alt="PLAINTEXT" title="PLAINTEXT"></img></li><li>SSL <img src="../../../../../html/images/iconInfo.png" alt="SSL" title="SSL"></img></li><li>SASL_PLAINTEXT <img src="../../../../../html/images/iconInfo.png" alt="SASL_PLAINTEXT" title="SASL_PLAINTEX
T"></img></li><li>SASL_SSL <img src="../../../../../html/images/iconInfo.png" alt="SASL_SSL" title="SASL_SSL"></img></li></ul></td><td id="description">Protocol used to communicate with brokers. Corresponds to Kafka's 'security.protocol' property.</td></tr><tr><td id="name">Kerberos Service Name</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos principal name that Kafka runs as. This can be defined either in Kafka's JAAS config or in Kafka's config. Corresponds to Kafka's 'security.protocol' property.It is ignored unless one of the SASL options of the <Security Protocol> are selected.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Credentials Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>KerberosCredentialsService<br/><strong>Implementation: </strong><a href="../../../nifi-
kerberos-credentials-service-nar/1.9.0/org.apache.nifi.kerberos.KeytabCredentialsService/index.html">KeytabCredentialsService</a></td><td id="description">Specifies the Kerberos Credentials Controller Service that should be used for authenticating with Kerberos</td></tr><tr><td id="name">Kerberos Principal</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos principal that will be used to connect to brokers. If not set, it is expected to set a JAAS configuration file in the JVM properties defined in the bootstrap.conf file. This principal will be set into 'sasl.jaas.config' Kafka's property.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Keytab</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos keytab that will be used to connect to brokers. If not set, it is expected to set a JAAS configuration file i
n the JVM properties defined in the bootstrap.conf file. This principal will be set into 'sasl.jaas.config' Kafka's property.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">SSL Context Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>SSLContextService<br/><strong>Implementations: </strong><a href="../../../nifi-ssl-context-service-nar/1.9.0/org.apache.nifi.ssl.StandardRestrictedSSLContextService/index.html">StandardRestrictedSSLContextService</a><br/><a href="../../../nifi-ssl-context-service-nar/1.9.0/org.apache.nifi.ssl.StandardSSLContextService/index.html">StandardSSLContextService</a></td><td id="description">Specifies the SSL Context Service to use for communicating with Kafka.</td></tr><tr><td id="name"><strong>Topic Name(s)</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The name of the
Kafka Topic(s) to pull from. More than one can be supplied if comma separated.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Topic Name Format</strong></td><td id="default-value">names</td><td id="allowable-values"><ul><li>names <img src="../../../../../html/images/iconInfo.png" alt="Topic is a full topic name or comma separated list of names" title="Topic is a full topic name or comma separated list of names"></img></li><li>pattern <img src="../../../../../html/images/iconInfo.png" alt="Topic is a regex using the Java Pattern syntax" title="Topic is a regex using the Java Pattern syntax"></img></li></ul></td><td id="description">Specifies whether the Topic(s) provided are a comma separated list of names or a single regular expression</td></tr><tr><td id="name"><strong>Honor Transactions</strong></td><td id="default-value">true</td><td id="allowable-values"><ul><li>true</li><li>false</li><
/ul></td><td id="description">Specifies whether or not NiFi should honor transactional guarantees when communicating with Kafka. If false, the Processor will use an "isolation level" of read_uncomitted. This means that messages will be received as soon as they are written to Kafka but will be pulled, even if the producer cancels the transactions. If this value is true, NiFi will not receive any messages for which the producer's transaction was canceled, but this can result in some latency since the consumer must wait for the producer to finish its entire transaction instead of pulling as the messages become available.</td></tr><tr><td id="name"><strong>Group ID</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A Group ID is used to identify consumers that are within the same consumer group. Corresponds to Kafka's 'group.id' property.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td
></tr><tr><td id="name"><strong>Offset Reset</strong></td><td id="default-value">latest</td><td id="allowable-values"><ul><li>earliest <img src="../../../../../html/images/iconInfo.png" alt="Automatically reset the offset to the earliest offset" title="Automatically reset the offset to the earliest offset"></img></li><li>latest <img src="../../../../../html/images/iconInfo.png" alt="Automatically reset the offset to the latest offset" title="Automatically reset the offset to the latest offset"></img></li><li>none <img src="../../../../../html/images/iconInfo.png" alt="Throw exception to the consumer if no previous offset is found for the consumer's group" title="Throw exception to the consumer if no previous offset is found for the consumer's group"></img></li></ul></td><td id="description">Allows you to manage the condition when there is no initial offset in Kafka or if the current offset does not exist any more on the server (e.g. because that data has been deleted). Corresponds t
o Kafka's 'auto.offset.reset' property.</td></tr><tr><td id="name"><strong>Key Attribute Encoding</strong></td><td id="default-value">utf-8</td><td id="allowable-values"><ul><li>UTF-8 Encoded <img src="../../../../../html/images/iconInfo.png" alt="The key is interpreted as a UTF-8 Encoded string." title="The key is interpreted as a UTF-8 Encoded string."></img></li><li>Hex Encoded <img src="../../../../../html/images/iconInfo.png" alt="The key is interpreted as arbitrary binary data and is encoded using hexadecimal characters with uppercase letters" title="The key is interpreted as arbitrary binary data and is encoded using hexadecimal characters with uppercase letters"></img></li></ul></td><td id="description">FlowFiles that are emitted have an attribute named 'kafka.key'. This property dictates how the value of the attribute should be encoded.</td></tr><tr><td id="name">Message Demarcator</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Since Kaf
kaConsumer receives messages in batches, you have an option to output FlowFiles which contains all Kafka messages in a single batch for a given topic and partition and this property allows you to provide a string (interpreted as UTF-8) to use for demarcating apart multiple Kafka messages. This is an optional property and if not provided each Kafka message received will result in a single FlowFile which time it is triggered. To enter special character such as 'new line' use CTRL+Enter or Shift+Enter depending on the OS<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Message Header Encoding</td><td id="default-value">UTF-8</td><td id="allowable-values"></td><td id="description">Any message header that is found on a Kafka message will be added to the outbound FlowFile as an attribute. This property indicates the Character Encoding to use for deserializing the headers.</td></tr><tr><td id="name">Headers
to Add as Attributes (Regex)</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A Regular Expression that is matched against all message headers. Any message header whose name matches the regex will be added to the FlowFile as an Attribute. If not specified, no Header values will be added as FlowFile attributes. If two messages have a different value for the same header and that header is selected by the provided regex, then those two messages must be added to different FlowFiles. As a result, users should be cautious about using a regex like ".*" if messages are expected to have header values that are unique per message, such as an identifier or timestamp, because it will prevent NiFi from bundling the messages together efficiently.</td></tr><tr><td id="name">Max Poll Records</td><td id="default-value">10000</td><td id="allowable-values"></td><td id="description">Specifies the maximum number of records Kafka should return in a single poll.</td></tr
><tr><td id="name">Max Uncommitted Time</td><td id="default-value">1 secs</td><td id="allowable-values"></td><td id="description">Specifies the maximum amount of time allowed to pass before offsets must be committed. This value impacts how often offsets will be committed. Committing offsets less often increases throughput but also increases the window of potential data duplication in the event of a rebalance or JVM restart between commits. This value is also related to maximum poll records and the use of a message demarcator. When using a message demarcator we can have far more uncommitted messages than when we're not as there is much less for us to keep track of in memory.</td></tr></table><h3>Dynamic Properties: </h3><p>Dynamic Properties allow the user to specify both the name and value of a property.<table id="dynamic-properties"><tr><th>Name</th><th>Value</th><th>Description</th></tr><tr><td id="name">The name of a Kafka configuration property.</td><td id="value">The value o
f a given Kafka configuration property.</td><td>These properties will be added on the Kafka configuration after loading any provided configuration properties. In the event a dynamic property represents a property that was already set, its value will be ignored and WARN message logged. For the list of available Kafka properties please refer to: http://kafka.apache.org/documentation.html#configuration. <br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr></table></p><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>FlowFiles received from Kafka. Depending on demarcation strategy it is a flow file per message or a bundle of messages grouped by topic and partition.</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3><table id="writes-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>kafka.count</td><td>The number o
f messages written if more than one</td></tr><tr><td>kafka.key</td><td>The key of message if present and if single message. How the key is encoded depends on the value of the 'Key Attribute Encoding' property.</td></tr><tr><td>kafka.offset</td><td>The offset of the message in the partition of the topic.</td></tr><tr><td>kafka.partition</td><td>The partition of the topic the message or message bundle is from</td></tr><tr><td>kafka.topic</td><td>The topic the message or message bundle is from</td></tr></table><h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>Input requirement: </h3>This component does not allow an incoming relationship.<h3>System Resource Considerations:</h3>None specified.</body></html>
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URL: http://svn.apache.org/viewvc/nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.PublishKafkaRecord_1_0/additionalDetails.html?rev=1854109&view=auto
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--- nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.PublishKafkaRecord_1_0/additionalDetails.html (added)
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+<!DOCTYPE html>
+<html lang="en">
+ <!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ -->
+ <head>
+ <meta charset="utf-8" />
+ <title>PublishKafka</title>
+ <link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css" />
+ </head>
+
+ <body>
+ <h2>Description</h2>
+ <p>
+ This Processor puts the contents of a FlowFile to a Topic in
+ <a href="http://kafka.apache.org/">Apache Kafka</a> using KafkaProducer API available
+ with Kafka 1.0 API. The contents of the incoming FlowFile will be read using the
+ configured Record Reader. Each record will then be serialized using the configured
+ Record Writer, and this serialized form will be the content of a Kafka message.
+ This message is optionally assigned a key by using the <Kafka Key> Property.
+ </p>
+
+
+ <h2>Security Configuration</h2>
+ <p>
+ The Security Protocol property allows the user to specify the protocol for communicating
+ with the Kafka broker. The following sections describe each of the protocols in further detail.
+ </p>
+ <h3>PLAINTEXT</h3>
+ <p>
+ This option provides an unsecured connection to the broker, with no client authentication and no encryption.
+ In order to use this option the broker must be configured with a listener of the form:
+ <pre>
+ PLAINTEXT://host.name:port
+ </pre>
+ </p>
+ <h3>SSL</h3>
+ <p>
+ This option provides an encrypted connection to the broker, with optional client authentication. In order
+ to use this option the broker must be configured with a listener of the form:
+ <pre>
+ SSL://host.name:port
+ </pre>
+ In addition, the processor must have an SSL Context Service selected.
+ </p>
+ <p>
+ If the broker specifies ssl.client.auth=none, or does not specify ssl.client.auth, then the client will
+ not be required to present a certificate. In this case, the SSL Context Service selected may specify only
+ a truststore containing the public key of the certificate authority used to sign the broker's key.
+ </p>
+ <p>
+ If the broker specifies ssl.client.auth=required then the client will be required to present a certificate.
+ In this case, the SSL Context Service must also specify a keystore containing a client key, in addition to
+ a truststore as described above.
+ </p>
+ <h3>SASL_PLAINTEXT</h3>
+ <p>
+ This option uses SASL with a PLAINTEXT transport layer to authenticate to the broker. In order to use this
+ option the broker must be configured with a listener of the form:
+ <pre>
+ SASL_PLAINTEXT://host.name:port
+ </pre>
+ In addition, the Kerberos Service Name must be specified in the processor.
+ </p>
+ <h4>SASL_PLAINTEXT - GSSAPI</h4>
+ <p>
+ If the SASL mechanism is GSSAPI, then the client must provide a JAAS configuration to authenticate. The
+ JAAS configuration can be provided by specifying the java.security.auth.login.config system property in
+ NiFi's bootstrap.conf, such as:
+ <pre>
+ java.arg.16=-Djava.security.auth.login.config=/path/to/kafka_client_jaas.conf
+ </pre>
+ </p>
+ <p>
+ An example of the JAAS config file would be the following:
+ <pre>
+ KafkaClient {
+ com.sun.security.auth.module.Krb5LoginModule required
+ useKeyTab=true
+ storeKey=true
+ keyTab="/path/to/nifi.keytab"
+ serviceName="kafka"
+ principal="nifi@YOURREALM.COM";
+ };
+ </pre>
+ <b>NOTE:</b> The serviceName in the JAAS file must match the Kerberos Service Name in the processor.
+ </p>
+ <p>
+ Alternatively, the JAAS
+ configuration when using GSSAPI can be provided by specifying the Kerberos Principal and Kerberos Keytab
+ directly in the processor properties. This will dynamically create a JAAS configuration like above, and
+ will take precedence over the java.security.auth.login.config system property.
+ </p>
+ <h4>SASL_PLAINTEXT - PLAIN</h4>
+ <p>
+ If the SASL mechanism is PLAIN, then client must provide a JAAS configuration to authenticate, but
+ the JAAS configuration must use Kafka's PlainLoginModule. An example of the JAAS config file would
+ be the following:
+ <pre>
+ KafkaClient {
+ org.apache.kafka.common.security.plain.PlainLoginModule required
+ username="nifi"
+ password="nifi-password";
+ };
+ </pre>
+ </p>
+ <p>
+ <b>NOTE:</b> It is not recommended to use a SASL mechanism of PLAIN with SASL_PLAINTEXT, as it would transmit
+ the username and password unencrypted.
+ </p>
+ <p>
+ <b>NOTE:</b> Using the PlainLoginModule will cause it be registered in the JVM's static list of Providers, making
+ it visible to components in other NARs that may access the providers. There is currently a known issue
+ where Kafka processors using the PlainLoginModule will cause HDFS processors with Keberos to no longer work.
+ </p>
+ <h3>SASL_SSL</h3>
+ <p>
+ This option uses SASL with an SSL/TLS transport layer to authenticate to the broker. In order to use this
+ option the broker must be configured with a listener of the form:
+ <pre>
+ SASL_SSL://host.name:port
+ </pre>
+ </p>
+ <p>
+ See the SASL_PLAINTEXT section for a description of how to provide the proper JAAS configuration
+ depending on the SASL mechanism (GSSAPI or PLAIN).
+ </p>
+ <p>
+ See the SSL section for a description of how to configure the SSL Context Service based on the
+ ssl.client.auth property.
+ </p>
+ </body>
+</html>
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URL: http://svn.apache.org/viewvc/nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.PublishKafkaRecord_1_0/index.html?rev=1854109&view=auto
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--- nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.PublishKafkaRecord_1_0/index.html (added)
+++ nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.PublishKafkaRecord_1_0/index.html Fri Feb 22 01:03:44 2019
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>PublishKafkaRecord_1_0</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">PublishKafkaRecord_1_0</h1><h2>Description: </h2><p>Sends the contents of a FlowFile as individual records to Apache Kafka using the Kafka 1.0 Producer API. The contents of the FlowFile are expected to be record-oriented data that can be read by the configured Record Reader. The complementary NiFi processor for fetching messages is ConsumeKafkaRecord_1_0.</p><p><a href="additionalDetails.html">Additional Details...</a></p><h3>Tags: </h3><p>Apache, Kafka, Record, csv, json, avro, logs, Put, Send, Message, PubSub, 1.0</p><h3>Properties: </h3><p>In the list below, the names of required prope
rties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Kafka Brokers</strong></td><td id="default-value">localhost:9092</td><td id="allowable-values"></td><td id="description">A comma-separated list of known Kafka Brokers in the format <host>:<port><br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Topic Name</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The name of the Kafka Topic to publish to.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attribute
s and variable registry)</strong></td></tr><tr><td id="name"><strong>Record Reader</strong></td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>RecordReaderFactory<br/><strong>Implementations: </strong><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.json.JsonTreeReader/index.html">JsonTreeReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.xml.XMLReader/index.html">XMLReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.json.JsonPathReader/index.html">JsonPathReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.syslog.Syslog5424Reader/index.html">Syslog5424Reader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.grok.GrokReader/index.html">GrokReader</a><br/><a href="../../../nifi-scripting-nar/1.9.0/org.apache.nifi.record.script.ScriptedReade
r/index.html">ScriptedReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.avro.AvroReader/index.html">AvroReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.csv.CSVReader/index.html">CSVReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.syslog.SyslogReader/index.html">SyslogReader</a></td><td id="description">The Record Reader to use for incoming FlowFiles</td></tr><tr><td id="name"><strong>Record Writer</strong></td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>RecordSetWriterFactory<br/><strong>Implementations: </strong><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.xml.XMLRecordSetWriter/index.html">XMLRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.json.JsonRecordSetWriter/index.html">JsonRecordSetWriter</a><br/><a
href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.csv.CSVRecordSetWriter/index.html">CSVRecordSetWriter</a><br/><a href="../../../nifi-scripting-nar/1.9.0/org.apache.nifi.record.script.ScriptedRecordSetWriter/index.html">ScriptedRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.avro.AvroRecordSetWriter/index.html">AvroRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.text.FreeFormTextRecordSetWriter/index.html">FreeFormTextRecordSetWriter</a></td><td id="description">The Record Writer to use in order to serialize the data before sending to Kafka</td></tr><tr><td id="name"><strong>Use Transactions</strong></td><td id="default-value">true</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Specifies whether or not NiFi should provide Transactional guarantees when communicating with Kafka. If there is a problem send
ing data to Kafka, and this property is set to false, then the messages that have already been sent to Kafka will continue on and be delivered to consumers. If this is set to true, then the Kafka transaction will be rolled back so that those messages are not available to consumers. Setting this to true requires that the <Delivery Guarantee> property be set to "Guarantee Replicated Delivery."</td></tr><tr><td id="name"><strong>Delivery Guarantee</strong></td><td id="default-value">0</td><td id="allowable-values"><ul><li>Best Effort <img src="../../../../../html/images/iconInfo.png" alt="FlowFile will be routed to success after successfully writing the content to a Kafka node, without waiting for a response. This provides the best performance but may result in data loss." title="FlowFile will be routed to success after successfully writing the content to a Kafka node, without waiting for a response. This provides the best performance but may result in data loss."></img></li><li>
Guarantee Single Node Delivery <img src="../../../../../html/images/iconInfo.png" alt="FlowFile will be routed to success if the message is received by a single Kafka node, whether or not it is replicated. This is faster than <Guarantee Replicated Delivery> but can result in data loss if a Kafka node crashes" title="FlowFile will be routed to success if the message is received by a single Kafka node, whether or not it is replicated. This is faster than <Guarantee Replicated Delivery> but can result in data loss if a Kafka node crashes"></img></li><li>Guarantee Replicated Delivery <img src="../../../../../html/images/iconInfo.png" alt="FlowFile will be routed to failure unless the message is replicated to the appropriate number of Kafka Nodes according to the Topic configuration" title="FlowFile will be routed to failure unless the message is replicated to the appropriate number of Kafka Nodes according to the Topic configuration"></img></li></ul></td><td id="description"
>Specifies the requirement for guaranteeing that a message is sent to Kafka. Corresponds to Kafka's 'acks' property.</td></tr><tr><td id="name">Attributes to Send as Headers (Regex)</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A Regular Expression that is matched against all FlowFile attribute names. Any attribute whose name matches the regex will be added to the Kafka messages as a Header. If not specified, no FlowFile attributes will be added as headers.</td></tr><tr><td id="name">Message Header Encoding</td><td id="default-value">UTF-8</td><td id="allowable-values"></td><td id="description">For any attribute that is added as a message header, as configured via the <Attributes to Send as Headers> property, this property indicates the Character Encoding to use for serializing the headers.</td></tr><tr><td id="name"><strong>Security Protocol</strong></td><td id="default-value">PLAINTEXT</td><td id="allowable-values"><ul><li>PLAINTEXT <img
src="../../../../../html/images/iconInfo.png" alt="PLAINTEXT" title="PLAINTEXT"></img></li><li>SSL <img src="../../../../../html/images/iconInfo.png" alt="SSL" title="SSL"></img></li><li>SASL_PLAINTEXT <img src="../../../../../html/images/iconInfo.png" alt="SASL_PLAINTEXT" title="SASL_PLAINTEXT"></img></li><li>SASL_SSL <img src="../../../../../html/images/iconInfo.png" alt="SASL_SSL" title="SASL_SSL"></img></li></ul></td><td id="description">Protocol used to communicate with brokers. Corresponds to Kafka's 'security.protocol' property.</td></tr><tr><td id="name">Kerberos Credentials Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>KerberosCredentialsService<br/><strong>Implementation: </strong><a href="../../../nifi-kerberos-credentials-service-nar/1.9.0/org.apache.nifi.kerberos.KeytabCredentialsService/index.html">KeytabCredentialsService</a></td><td id="description">Specifies the Kerberos Credentials Controller Servic
e that should be used for authenticating with Kerberos</td></tr><tr><td id="name">Kerberos Service Name</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos principal name that Kafka runs as. This can be defined either in Kafka's JAAS config or in Kafka's config. Corresponds to Kafka's 'security.protocol' property.It is ignored unless one of the SASL options of the <Security Protocol> are selected.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Principal</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos principal that will be used to connect to brokers. If not set, it is expected to set a JAAS configuration file in the JVM properties defined in the bootstrap.conf file. This principal will be set into 'sasl.jaas.config' Kafka's property.<br/><strong>Supports Expression Language: true (will be eva
luated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Keytab</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos keytab that will be used to connect to brokers. If not set, it is expected to set a JAAS configuration file in the JVM properties defined in the bootstrap.conf file. This principal will be set into 'sasl.jaas.config' Kafka's property.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">SSL Context Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>SSLContextService<br/><strong>Implementations: </strong><a href="../../../nifi-ssl-context-service-nar/1.9.0/org.apache.nifi.ssl.StandardRestrictedSSLContextService/index.html">StandardRestrictedSSLContextService</a><br/><a href="../../../nifi-ssl-context-service-nar/1.9.0/org.apache.nifi.ssl.StandardSSLContextService/
index.html">StandardSSLContextService</a></td><td id="description">Specifies the SSL Context Service to use for communicating with Kafka.</td></tr><tr><td id="name">Message Key Field</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The name of a field in the Input Records that should be used as the Key for the Kafka message.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Max Request Size</strong></td><td id="default-value">1 MB</td><td id="allowable-values"></td><td id="description">The maximum size of a request in bytes. Corresponds to Kafka's 'max.request.size' property and defaults to 1 MB (1048576).</td></tr><tr><td id="name"><strong>Acknowledgment Wait Time</strong></td><td id="default-value">5 secs</td><td id="allowable-values"></td><td id="description">After sending a message to Kafka, this indicates the amount of time that we are
willing to wait for a response from Kafka. If Kafka does not acknowledge the message within this time period, the FlowFile will be routed to 'failure'.</td></tr><tr><td id="name"><strong>Max Metadata Wait Time</strong></td><td id="default-value">5 sec</td><td id="allowable-values"></td><td id="description">The amount of time publisher will wait to obtain metadata or wait for the buffer to flush during the 'send' call before failing the entire 'send' call. Corresponds to Kafka's 'max.block.ms' property<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Partitioner class</td><td id="default-value">org.apache.kafka.clients.producer.internals.DefaultPartitioner</td><td id="allowable-values"><ul><li>RoundRobinPartitioner <img src="../../../../../html/images/iconInfo.png" alt="Messages will be assigned partitions in a round-robin fashion, sending the first message to Partition 1, the next Partition to Partit
ion 2, and so on, wrapping as necessary." title="Messages will be assigned partitions in a round-robin fashion, sending the first message to Partition 1, the next Partition to Partition 2, and so on, wrapping as necessary."></img></li><li>DefaultPartitioner <img src="../../../../../html/images/iconInfo.png" alt="Messages will be assigned to random partitions." title="Messages will be assigned to random partitions."></img></li></ul></td><td id="description">Specifies which class to use to compute a partition id for a message. Corresponds to Kafka's 'partitioner.class' property.</td></tr><tr><td id="name"><strong>Compression Type</strong></td><td id="default-value">none</td><td id="allowable-values"><ul><li>none</li><li>gzip</li><li>snappy</li><li>lz4</li></ul></td><td id="description">This parameter allows you to specify the compression codec for all data generated by this producer.</td></tr></table><h3>Dynamic Properties: </h3><p>Dynamic Properties allow the user to specify both the
name and value of a property.<table id="dynamic-properties"><tr><th>Name</th><th>Value</th><th>Description</th></tr><tr><td id="name">The name of a Kafka configuration property.</td><td id="value">The value of a given Kafka configuration property.</td><td>These properties will be added on the Kafka configuration after loading any provided configuration properties. In the event a dynamic property represents a property that was already set, its value will be ignored and WARN message logged. For the list of available Kafka properties please refer to: http://kafka.apache.org/documentation.html#configuration. <br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr></table></p><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>FlowFiles for which all content was sent to Kafka.</td></tr><tr><td>failure</td><td>Any FlowFile that cannot be sent to Kafka will be routed
to this Relationship</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3><table id="writes-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>msg.count</td><td>The number of messages that were sent to Kafka for this FlowFile. This attribute is added only to FlowFiles that are routed to success.</td></tr></table><h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>Input requirement: </h3>This component requires an incoming relationship.<h3>System Resource Considerations:</h3>None specified.<h3>See Also:</h3><p><a href="../org.apache.nifi.processors.kafka.pubsub.PublishKafka_1_0/index.html">PublishKafka_1_0</a>, <a href="../org.apache.nifi.processors.kafka.pubsub.ConsumeKafka_1_0/index.html">ConsumeKafka_1_0</a>, <a href="../org.apache.nifi.processors.kafka.pubsub.ConsumeKafkaRecord_1_0/index.html">ConsumeKafkaRecord_1_0</a></p></body></html>
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@@ -0,0 +1,156 @@
+<!DOCTYPE html>
+<html lang="en">
+ <!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ -->
+ <head>
+ <meta charset="utf-8" />
+ <title>PublishKafka</title>
+ <link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css" />
+ </head>
+
+ <body>
+ <h2>Description</h2>
+ <p>
+ This Processor puts the contents of a FlowFile to a Topic in
+ <a href="http://kafka.apache.org/">Apache Kafka</a> using KafkaProducer API available
+ with Kafka 1.0 API. The content of a FlowFile becomes the contents of a Kafka message.
+ This message is optionally assigned a key by using the <Kafka Key> Property.
+ </p>
+
+ <p>
+ The Processor allows the user to configure an optional Message Demarcator that
+ can be used to send many messages per FlowFile. For example, a <i>\n</i> could be used
+ to indicate that the contents of the FlowFile should be used to send one message
+ per line of text. It also supports multi-char demarcators (e.g., 'my custom demarcator').
+ If the property is not set, the entire contents of the FlowFile
+ will be sent as a single message. When using the demarcator, if some messages are
+ successfully sent but other messages fail to send, the resulting FlowFile will be
+ considered a failed FlowFile and will have additional attributes to that effect.
+ One of such attributes is 'failed.last.idx' which indicates the index of the last message
+ that was successfully ACKed by Kafka. (if no demarcator is used the value of this index will be -1).
+ This will allow PublishKafka to only re-send un-ACKed messages on the next re-try.
+ </p>
+
+
+ <h2>Security Configuration</h2>
+ <p>
+ The Security Protocol property allows the user to specify the protocol for communicating
+ with the Kafka broker. The following sections describe each of the protocols in further detail.
+ </p>
+ <h3>PLAINTEXT</h3>
+ <p>
+ This option provides an unsecured connection to the broker, with no client authentication and no encryption.
+ In order to use this option the broker must be configured with a listener of the form:
+ <pre>
+ PLAINTEXT://host.name:port
+ </pre>
+ </p>
+ <h3>SSL</h3>
+ <p>
+ This option provides an encrypted connection to the broker, with optional client authentication. In order
+ to use this option the broker must be configured with a listener of the form:
+ <pre>
+ SSL://host.name:port
+ </pre>
+ In addition, the processor must have an SSL Context Service selected.
+ </p>
+ <p>
+ If the broker specifies ssl.client.auth=none, or does not specify ssl.client.auth, then the client will
+ not be required to present a certificate. In this case, the SSL Context Service selected may specify only
+ a truststore containing the public key of the certificate authority used to sign the broker's key.
+ </p>
+ <p>
+ If the broker specifies ssl.client.auth=required then the client will be required to present a certificate.
+ In this case, the SSL Context Service must also specify a keystore containing a client key, in addition to
+ a truststore as described above.
+ </p>
+ <h3>SASL_PLAINTEXT</h3>
+ <p>
+ This option uses SASL with a PLAINTEXT transport layer to authenticate to the broker. In order to use this
+ option the broker must be configured with a listener of the form:
+ <pre>
+ SASL_PLAINTEXT://host.name:port
+ </pre>
+ In addition, the Kerberos Service Name must be specified in the processor.
+ </p>
+ <h4>SASL_PLAINTEXT - GSSAPI</h4>
+ <p>
+ If the SASL mechanism is GSSAPI, then the client must provide a JAAS configuration to authenticate. The
+ JAAS configuration can be provided by specifying the java.security.auth.login.config system property in
+ NiFi's bootstrap.conf, such as:
+ <pre>
+ java.arg.16=-Djava.security.auth.login.config=/path/to/kafka_client_jaas.conf
+ </pre>
+ </p>
+ <p>
+ An example of the JAAS config file would be the following:
+ <pre>
+ KafkaClient {
+ com.sun.security.auth.module.Krb5LoginModule required
+ useKeyTab=true
+ storeKey=true
+ keyTab="/path/to/nifi.keytab"
+ serviceName="kafka"
+ principal="nifi@YOURREALM.COM";
+ };
+ </pre>
+ <b>NOTE:</b> The serviceName in the JAAS file must match the Kerberos Service Name in the processor.
+ </p>
+ <p>
+ Alternatively, the JAAS
+ configuration when using GSSAPI can be provided by specifying the Kerberos Principal and Kerberos Keytab
+ directly in the processor properties. This will dynamically create a JAAS configuration like above, and
+ will take precedence over the java.security.auth.login.config system property.
+ </p>
+ <h4>SASL_PLAINTEXT - PLAIN</h4>
+ <p>
+ If the SASL mechanism is PLAIN, then client must provide a JAAS configuration to authenticate, but
+ the JAAS configuration must use Kafka's PlainLoginModule. An example of the JAAS config file would
+ be the following:
+ <pre>
+ KafkaClient {
+ org.apache.kafka.common.security.plain.PlainLoginModule required
+ username="nifi"
+ password="nifi-password";
+ };
+ </pre>
+ </p>
+ <p>
+ <b>NOTE:</b> It is not recommended to use a SASL mechanism of PLAIN with SASL_PLAINTEXT, as it would transmit
+ the username and password unencrypted.
+ </p>
+ <p>
+ <b>NOTE:</b> Using the PlainLoginModule will cause it be registered in the JVM's static list of Providers, making
+ it visible to components in other NARs that may access the providers. There is currently a known issue
+ where Kafka processors using the PlainLoginModule will cause HDFS processors with Keberos to no longer work.
+ </p>
+ <h3>SASL_SSL</h3>
+ <p>
+ This option uses SASL with an SSL/TLS transport layer to authenticate to the broker. In order to use this
+ option the broker must be configured with a listener of the form:
+ <pre>
+ SASL_SSL://host.name:port
+ </pre>
+ </p>
+ <p>
+ See the SASL_PLAINTEXT section for a description of how to provide the proper JAAS configuration
+ depending on the SASL mechanism (GSSAPI or PLAIN).
+ </p>
+ <p>
+ See the SSL section for a description of how to configure the SSL Context Service based on the
+ ssl.client.auth property.
+ </p>
+ </body>
+</html>
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URL: http://svn.apache.org/viewvc/nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.PublishKafka_1_0/index.html?rev=1854109&view=auto
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--- nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.PublishKafka_1_0/index.html (added)
+++ nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-kafka-1-0-nar/1.9.0/org.apache.nifi.processors.kafka.pubsub.PublishKafka_1_0/index.html Fri Feb 22 01:03:44 2019
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>PublishKafka_1_0</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">PublishKafka_1_0</h1><h2>Description: </h2><p>Sends the contents of a FlowFile as a message to Apache Kafka using the Kafka 1.0 Producer API.The messages to send may be individual FlowFiles or may be delimited, using a user-specified delimiter, such as a new-line. The complementary NiFi processor for fetching messages is ConsumeKafka_1_0.</p><p><a href="additionalDetails.html">Additional Details...</a></p><h3>Tags: </h3><p>Apache, Kafka, Put, Send, Message, PubSub, 1.0</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other prope
rties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Kafka Brokers</strong></td><td id="default-value">localhost:9092</td><td id="allowable-values"></td><td id="description">A comma-separated list of known Kafka Brokers in the format <host>:<port><br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Security Protocol</strong></td><td id="default-value">PLAINTEXT</td><td id="allowable-values"><ul><li>PLAINTEXT <img src="../../../../../html/images/iconInfo.png" alt="PLAINTEXT" title="PLAINTEXT"></img></li><li>SSL <img src="../../../../../html/images/iconInfo.png" alt="SSL" title="SSL"></i
mg></li><li>SASL_PLAINTEXT <img src="../../../../../html/images/iconInfo.png" alt="SASL_PLAINTEXT" title="SASL_PLAINTEXT"></img></li><li>SASL_SSL <img src="../../../../../html/images/iconInfo.png" alt="SASL_SSL" title="SASL_SSL"></img></li></ul></td><td id="description">Protocol used to communicate with brokers. Corresponds to Kafka's 'security.protocol' property.</td></tr><tr><td id="name">Kerberos Service Name</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos principal name that Kafka runs as. This can be defined either in Kafka's JAAS config or in Kafka's config. Corresponds to Kafka's 'security.protocol' property.It is ignored unless one of the SASL options of the <Security Protocol> are selected.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Credentials Service</td><td id="default-value"></td><td id="allowable-values"><strong>Contro
ller Service API: </strong><br/>KerberosCredentialsService<br/><strong>Implementation: </strong><a href="../../../nifi-kerberos-credentials-service-nar/1.9.0/org.apache.nifi.kerberos.KeytabCredentialsService/index.html">KeytabCredentialsService</a></td><td id="description">Specifies the Kerberos Credentials Controller Service that should be used for authenticating with Kerberos</td></tr><tr><td id="name">Kerberos Principal</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos principal that will be used to connect to brokers. If not set, it is expected to set a JAAS configuration file in the JVM properties defined in the bootstrap.conf file. This principal will be set into 'sasl.jaas.config' Kafka's property.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Keytab</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The
Kerberos keytab that will be used to connect to brokers. If not set, it is expected to set a JAAS configuration file in the JVM properties defined in the bootstrap.conf file. This principal will be set into 'sasl.jaas.config' Kafka's property.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">SSL Context Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>SSLContextService<br/><strong>Implementations: </strong><a href="../../../nifi-ssl-context-service-nar/1.9.0/org.apache.nifi.ssl.StandardRestrictedSSLContextService/index.html">StandardRestrictedSSLContextService</a><br/><a href="../../../nifi-ssl-context-service-nar/1.9.0/org.apache.nifi.ssl.StandardSSLContextService/index.html">StandardSSLContextService</a></td><td id="description">Specifies the SSL Context Service to use for communicating with Kafka.</td></tr><tr><td id="name"><strong>Top
ic Name</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The name of the Kafka Topic to publish to.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Delivery Guarantee</strong></td><td id="default-value">0</td><td id="allowable-values"><ul><li>Best Effort <img src="../../../../../html/images/iconInfo.png" alt="FlowFile will be routed to success after successfully writing the content to a Kafka node, without waiting for a response. This provides the best performance but may result in data loss." title="FlowFile will be routed to success after successfully writing the content to a Kafka node, without waiting for a response. This provides the best performance but may result in data loss."></img></li><li>Guarantee Single Node Delivery <img src="../../../../../html/images/iconInfo.png" alt="FlowFile will be routed to success if the mes
sage is received by a single Kafka node, whether or not it is replicated. This is faster than <Guarantee Replicated Delivery> but can result in data loss if a Kafka node crashes" title="FlowFile will be routed to success if the message is received by a single Kafka node, whether or not it is replicated. This is faster than <Guarantee Replicated Delivery> but can result in data loss if a Kafka node crashes"></img></li><li>Guarantee Replicated Delivery <img src="../../../../../html/images/iconInfo.png" alt="FlowFile will be routed to failure unless the message is replicated to the appropriate number of Kafka Nodes according to the Topic configuration" title="FlowFile will be routed to failure unless the message is replicated to the appropriate number of Kafka Nodes according to the Topic configuration"></img></li></ul></td><td id="description">Specifies the requirement for guaranteeing that a message is sent to Kafka. Corresponds to Kafka's 'acks' property.</td></tr><tr><t
d id="name"><strong>Use Transactions</strong></td><td id="default-value">true</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Specifies whether or not NiFi should provide Transactional guarantees when communicating with Kafka. If there is a problem sending data to Kafka, and this property is set to false, then the messages that have already been sent to Kafka will continue on and be delivered to consumers. If this is set to true, then the Kafka transaction will be rolled back so that those messages are not available to consumers. Setting this to true requires that the <Delivery Guarantee> property be set to "Guarantee Replicated Delivery."</td></tr><tr><td id="name">Attributes to Send as Headers (Regex)</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A Regular Expression that is matched against all FlowFile attribute names. Any attribute whose name matches the regex will be added to the Kafka messa
ges as a Header. If not specified, no FlowFile attributes will be added as headers.</td></tr><tr><td id="name">Message Header Encoding</td><td id="default-value">UTF-8</td><td id="allowable-values"></td><td id="description">For any attribute that is added as a message header, as configured via the <Attributes to Send as Headers> property, this property indicates the Character Encoding to use for serializing the headers.</td></tr><tr><td id="name">Kafka Key</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Key to use for the Message. If not specified, the flow file attribute 'kafka.key' is used as the message key, if it is present.Beware that setting Kafka key and demarcating at the same time may potentially lead to many Kafka messages with the same key.Normally this is not a problem as Kafka does not enforce or assume message and key uniqueness. Still, setting the demarcator and Kafka key at the same time poses a risk of data loss on Kafka
. During a topic compaction on Kafka, messages will be deduplicated based on this key.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Key Attribute Encoding</strong></td><td id="default-value">utf-8</td><td id="allowable-values"><ul><li>UTF-8 Encoded <img src="../../../../../html/images/iconInfo.png" alt="The key is interpreted as a UTF-8 Encoded string." title="The key is interpreted as a UTF-8 Encoded string."></img></li><li>Hex Encoded <img src="../../../../../html/images/iconInfo.png" alt="The key is interpreted as arbitrary binary data that is encoded using hexadecimal characters with uppercase letters." title="The key is interpreted as arbitrary binary data that is encoded using hexadecimal characters with uppercase letters."></img></li></ul></td><td id="description">FlowFiles that are emitted have an attribute named 'kafka.key'. This property dictates how the value
of the attribute should be encoded.</td></tr><tr><td id="name">Message Demarcator</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Specifies the string (interpreted as UTF-8) to use for demarcating multiple messages within a single FlowFile. If not specified, the entire content of the FlowFile will be used as a single message. If specified, the contents of the FlowFile will be split on this delimiter and each section sent as a separate Kafka message. To enter special character such as 'new line' use CTRL+Enter or Shift+Enter, depending on your OS.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Max Request Size</strong></td><td id="default-value">1 MB</td><td id="allowable-values"></td><td id="description">The maximum size of a request in bytes. Corresponds to Kafka's 'max.request.size' property and defaults to 1 MB (1048576).</td></tr><
tr><td id="name"><strong>Acknowledgment Wait Time</strong></td><td id="default-value">5 secs</td><td id="allowable-values"></td><td id="description">After sending a message to Kafka, this indicates the amount of time that we are willing to wait for a response from Kafka. If Kafka does not acknowledge the message within this time period, the FlowFile will be routed to 'failure'.</td></tr><tr><td id="name"><strong>Max Metadata Wait Time</strong></td><td id="default-value">5 sec</td><td id="allowable-values"></td><td id="description">The amount of time publisher will wait to obtain metadata or wait for the buffer to flush during the 'send' call before failing the entire 'send' call. Corresponds to Kafka's 'max.block.ms' property<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Partitioner class</td><td id="default-value">org.apache.kafka.clients.producer.internals.DefaultPartitioner</td><td id="allowable
-values"><ul><li>RoundRobinPartitioner <img src="../../../../../html/images/iconInfo.png" alt="Messages will be assigned partitions in a round-robin fashion, sending the first message to Partition 1, the next Partition to Partition 2, and so on, wrapping as necessary." title="Messages will be assigned partitions in a round-robin fashion, sending the first message to Partition 1, the next Partition to Partition 2, and so on, wrapping as necessary."></img></li><li>DefaultPartitioner <img src="../../../../../html/images/iconInfo.png" alt="Messages will be assigned to random partitions." title="Messages will be assigned to random partitions."></img></li></ul></td><td id="description">Specifies which class to use to compute a partition id for a message. Corresponds to Kafka's 'partitioner.class' property.</td></tr><tr><td id="name"><strong>Compression Type</strong></td><td id="default-value">none</td><td id="allowable-values"><ul><li>none</li><li>gzip</li><li>snappy</li><li>lz4</li></ul>
</td><td id="description">This parameter allows you to specify the compression codec for all data generated by this producer.</td></tr></table><h3>Dynamic Properties: </h3><p>Dynamic Properties allow the user to specify both the name and value of a property.<table id="dynamic-properties"><tr><th>Name</th><th>Value</th><th>Description</th></tr><tr><td id="name">The name of a Kafka configuration property.</td><td id="value">The value of a given Kafka configuration property.</td><td>These properties will be added on the Kafka configuration after loading any provided configuration properties. In the event a dynamic property represents a property that was already set, its value will be ignored and WARN message logged. For the list of available Kafka properties please refer to: http://kafka.apache.org/documentation.html#configuration. <br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr></table></p><h3>Relationships: </h3><tabl
e id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>FlowFiles for which all content was sent to Kafka.</td></tr><tr><td>failure</td><td>Any FlowFile that cannot be sent to Kafka will be routed to this Relationship</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3><table id="writes-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>msg.count</td><td>The number of messages that were sent to Kafka for this FlowFile. This attribute is added only to FlowFiles that are routed to success. If the <Message Demarcator> Property is not set, this will always be 1, but if the Property is set, it may be greater than 1.</td></tr></table><h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>Input requirement: </h3>This component requires an incoming relationship.<h3>System Resource Considerations:</h3>None specified.</body></html>
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+<!DOCTYPE html>
+<html lang="en">
+ <!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ -->
+ <head>
+ <meta charset="utf-8" />
+ <title>ConsumeKafkaRecord</title>
+ <link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css" />
+ </head>
+
+ <body>
+ <h2>Description</h2>
+ <p>
+ This Processor polls <a href="http://kafka.apache.org/">Apache Kafka</a>
+ for data using KafkaConsumer API available with Kafka 2.0. When a message is received
+ from Kafka, the message will be deserialized using the configured Record Reader, and then
+ written to a FlowFile by serializing the message with the configured Record Writer.
+ </p>
+
+
+ <h2>Security Configuration:</h2>
+ <p>
+ The Security Protocol property allows the user to specify the protocol for communicating
+ with the Kafka broker. The following sections describe each of the protocols in further detail.
+ </p>
+ <h3>PLAINTEXT</h3>
+ <p>
+ This option provides an unsecured connection to the broker, with no client authentication and no encryption.
+ In order to use this option the broker must be configured with a listener of the form:
+ <pre>
+ PLAINTEXT://host.name:port
+ </pre>
+ </p>
+ <h3>SSL</h3>
+ <p>
+ This option provides an encrypted connection to the broker, with optional client authentication. In order
+ to use this option the broker must be configured with a listener of the form:
+ <pre>
+ SSL://host.name:port
+ </pre>
+ In addition, the processor must have an SSL Context Service selected.
+ </p>
+ <p>
+ If the broker specifies ssl.client.auth=none, or does not specify ssl.client.auth, then the client will
+ not be required to present a certificate. In this case, the SSL Context Service selected may specify only
+ a truststore containing the public key of the certificate authority used to sign the broker's key.
+ </p>
+ <p>
+ If the broker specifies ssl.client.auth=required then the client will be required to present a certificate.
+ In this case, the SSL Context Service must also specify a keystore containing a client key, in addition to
+ a truststore as described above.
+ </p>
+ <h3>SASL_PLAINTEXT</h3>
+ <p>
+ This option uses SASL with a PLAINTEXT transport layer to authenticate to the broker. In order to use this
+ option the broker must be configured with a listener of the form:
+ <pre>
+ SASL_PLAINTEXT://host.name:port
+ </pre>
+ In addition, the Kerberos Service Name must be specified in the processor.
+ </p>
+ <h4>SASL_PLAINTEXT - GSSAPI</h4>
+ <p>
+ If the SASL mechanism is GSSAPI, then the client must provide a JAAS configuration to authenticate. The
+ JAAS configuration can be provided by specifying the java.security.auth.login.config system property in
+ NiFi's bootstrap.conf, such as:
+ <pre>
+ java.arg.16=-Djava.security.auth.login.config=/path/to/kafka_client_jaas.conf
+ </pre>
+ </p>
+ <p>
+ An example of the JAAS config file would be the following:
+ <pre>
+ KafkaClient {
+ com.sun.security.auth.module.Krb5LoginModule required
+ useKeyTab=true
+ storeKey=true
+ keyTab="/path/to/nifi.keytab"
+ serviceName="kafka"
+ principal="nifi@YOURREALM.COM";
+ };
+ </pre>
+ <b>NOTE:</b> The serviceName in the JAAS file must match the Kerberos Service Name in the processor.
+ </p>
+ <p>
+ Alternatively, the JAAS
+ configuration when using GSSAPI can be provided by specifying the Kerberos Principal and Kerberos Keytab
+ directly in the processor properties. This will dynamically create a JAAS configuration like above, and
+ will take precedence over the java.security.auth.login.config system property.
+ </p>
+ <h4>SASL_PLAINTEXT - PLAIN</h4>
+ <p>
+ If the SASL mechanism is PLAIN, then client must provide a JAAS configuration to authenticate, but
+ the JAAS configuration must use Kafka's PlainLoginModule. An example of the JAAS config file would
+ be the following:
+ <pre>
+ KafkaClient {
+ org.apache.kafka.common.security.plain.PlainLoginModule required
+ username="nifi"
+ password="nifi-password";
+ };
+ </pre>
+ </p>
+ <p>
+ <b>NOTE:</b> It is not recommended to use a SASL mechanism of PLAIN with SASL_PLAINTEXT, as it would transmit
+ the username and password unencrypted.
+ </p>
+ <p>
+ <b>NOTE:</b> Using the PlainLoginModule will cause it be registered in the JVM's static list of Providers, making
+ it visible to components in other NARs that may access the providers. There is currently a known issue
+ where Kafka processors using the PlainLoginModule will cause HDFS processors with Keberos to no longer work.
+ </p>
+ <h3>SASL_SSL</h3>
+ <p>
+ This option uses SASL with an SSL/TLS transport layer to authenticate to the broker. In order to use this
+ option the broker must be configured with a listener of the form:
+ <pre>
+ SASL_SSL://host.name:port
+ </pre>
+ </p>
+ <p>
+ See the SASL_PLAINTEXT section for a description of how to provide the proper JAAS configuration
+ depending on the SASL mechanism (GSSAPI or PLAIN).
+ </p>
+ <p>
+ See the SSL section for a description of how to configure the SSL Context Service based on the
+ ssl.client.auth property.
+ </p>
+
+ </body>
+</html>
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>ConsumeKafkaRecord_2_0</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">ConsumeKafkaRecord_2_0</h1><h2>Description: </h2><p>Consumes messages from Apache Kafka specifically built against the Kafka 2.0 Consumer API. The complementary NiFi processor for sending messages is PublishKafkaRecord_2_0. Please note that, at this time, the Processor assumes that all records that are retrieved from a given partition have the same schema. If any of the Kafka messages are pulled but cannot be parsed or written with the configured Record Reader or Record Writer, the contents of the message will be written to a separate FlowFile, and that FlowFile will be transferred to the
'parse.failure' relationship. Otherwise, each FlowFile is sent to the 'success' relationship and may contain many individual messages within the single FlowFile. A 'record.count' attribute is added to indicate how many messages are contained in the FlowFile. No two Kafka messages will be placed into the same FlowFile if they have different schemas, or if they have different values for a message header that is included by the <Headers to Add as Attributes> property.</p><p><a href="additionalDetails.html">Additional Details...</a></p><h3>Tags: </h3><p>Kafka, Get, Record, csv, avro, json, Ingest, Ingress, Topic, PubSub, Consume, 2.0</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><tabl
e id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Kafka Brokers</strong></td><td id="default-value">localhost:9092</td><td id="allowable-values"></td><td id="description">A comma-separated list of known Kafka Brokers in the format <host>:<port><br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Topic Name(s)</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The name of the Kafka Topic(s) to pull from. More than one can be supplied if comma separated.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Topic Name Format</strong></td><td id="default-value">names</td><td id="allowable-values"><ul><li>names <img src="../../../../../html/images/iconInfo.png" alt="Topic is a full
topic name or comma separated list of names" title="Topic is a full topic name or comma separated list of names"></img></li><li>pattern <img src="../../../../../html/images/iconInfo.png" alt="Topic is a regex using the Java Pattern syntax" title="Topic is a regex using the Java Pattern syntax"></img></li></ul></td><td id="description">Specifies whether the Topic(s) provided are a comma separated list of names or a single regular expression</td></tr><tr><td id="name"><strong>Record Reader</strong></td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>RecordReaderFactory<br/><strong>Implementations: </strong><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.json.JsonTreeReader/index.html">JsonTreeReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.xml.XMLReader/index.html">XMLReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.n
ifi.json.JsonPathReader/index.html">JsonPathReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.syslog.Syslog5424Reader/index.html">Syslog5424Reader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.grok.GrokReader/index.html">GrokReader</a><br/><a href="../../../nifi-scripting-nar/1.9.0/org.apache.nifi.record.script.ScriptedReader/index.html">ScriptedReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.avro.AvroReader/index.html">AvroReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.csv.CSVReader/index.html">CSVReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.syslog.SyslogReader/index.html">SyslogReader</a></td><td id="description">The Record Reader to use for incoming FlowFiles</td></tr><tr><td id="name"><strong>Record Writer</strong></td><td id="default-value"></td><td id="a
llowable-values"><strong>Controller Service API: </strong><br/>RecordSetWriterFactory<br/><strong>Implementations: </strong><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.xml.XMLRecordSetWriter/index.html">XMLRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.json.JsonRecordSetWriter/index.html">JsonRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.csv.CSVRecordSetWriter/index.html">CSVRecordSetWriter</a><br/><a href="../../../nifi-scripting-nar/1.9.0/org.apache.nifi.record.script.ScriptedRecordSetWriter/index.html">ScriptedRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.avro.AvroRecordSetWriter/index.html">AvroRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.text.FreeFormTextRecordSetWriter/index.html">FreeFormTextRecordSetWriter</a></td><t
d id="description">The Record Writer to use in order to serialize the data before sending to Kafka</td></tr><tr><td id="name"><strong>Honor Transactions</strong></td><td id="default-value">true</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Specifies whether or not NiFi should honor transactional guarantees when communicating with Kafka. If false, the Processor will use an "isolation level" of read_uncomitted. This means that messages will be received as soon as they are written to Kafka but will be pulled, even if the producer cancels the transactions. If this value is true, NiFi will not receive any messages for which the producer's transaction was canceled, but this can result in some latency since the consumer must wait for the producer to finish its entire transaction instead of pulling as the messages become available.</td></tr><tr><td id="name"><strong>Security Protocol</strong></td><td id="default-value">PLAINTEXT</td><td id="allo
wable-values"><ul><li>PLAINTEXT <img src="../../../../../html/images/iconInfo.png" alt="PLAINTEXT" title="PLAINTEXT"></img></li><li>SSL <img src="../../../../../html/images/iconInfo.png" alt="SSL" title="SSL"></img></li><li>SASL_PLAINTEXT <img src="../../../../../html/images/iconInfo.png" alt="SASL_PLAINTEXT" title="SASL_PLAINTEXT"></img></li><li>SASL_SSL <img src="../../../../../html/images/iconInfo.png" alt="SASL_SSL" title="SASL_SSL"></img></li></ul></td><td id="description">Protocol used to communicate with brokers. Corresponds to Kafka's 'security.protocol' property.</td></tr><tr><td id="name">Kerberos Credentials Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>KerberosCredentialsService<br/><strong>Implementation: </strong><a href="../../../nifi-kerberos-credentials-service-nar/1.9.0/org.apache.nifi.kerberos.KeytabCredentialsService/index.html">KeytabCredentialsService</a></td><td id="description">Specifies the Ke
rberos Credentials Controller Service that should be used for authenticating with Kerberos</td></tr><tr><td id="name">Kerberos Service Name</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos principal name that Kafka runs as. This can be defined either in Kafka's JAAS config or in Kafka's config. Corresponds to Kafka's 'security.protocol' property.It is ignored unless one of the SASL options of the <Security Protocol> are selected.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Principal</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos principal that will be used to connect to brokers. If not set, it is expected to set a JAAS configuration file in the JVM properties defined in the bootstrap.conf file. This principal will be set into 'sasl.jaas.config' Kafka's property.<br/><strong>Supports Ex
pression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Keytab</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The Kerberos keytab that will be used to connect to brokers. If not set, it is expected to set a JAAS configuration file in the JVM properties defined in the bootstrap.conf file. This principal will be set into 'sasl.jaas.config' Kafka's property.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">SSL Context Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>SSLContextService<br/><strong>Implementations: </strong><a href="../../../nifi-ssl-context-service-nar/1.9.0/org.apache.nifi.ssl.StandardRestrictedSSLContextService/index.html">StandardRestrictedSSLContextService</a><br/><a href="../../../nifi-ssl-context-service-nar/1.9.0/org.apache
.nifi.ssl.StandardSSLContextService/index.html">StandardSSLContextService</a></td><td id="description">Specifies the SSL Context Service to use for communicating with Kafka.</td></tr><tr><td id="name"><strong>Group ID</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A Group ID is used to identify consumers that are within the same consumer group. Corresponds to Kafka's 'group.id' property.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Offset Reset</strong></td><td id="default-value">latest</td><td id="allowable-values"><ul><li>earliest <img src="../../../../../html/images/iconInfo.png" alt="Automatically reset the offset to the earliest offset" title="Automatically reset the offset to the earliest offset"></img></li><li>latest <img src="../../../../../html/images/iconInfo.png" alt="Automatically reset the offset to the latest offset" title="Automa
tically reset the offset to the latest offset"></img></li><li>none <img src="../../../../../html/images/iconInfo.png" alt="Throw exception to the consumer if no previous offset is found for the consumer's group" title="Throw exception to the consumer if no previous offset is found for the consumer's group"></img></li></ul></td><td id="description">Allows you to manage the condition when there is no initial offset in Kafka or if the current offset does not exist any more on the server (e.g. because that data has been deleted). Corresponds to Kafka's 'auto.offset.reset' property.</td></tr><tr><td id="name">Message Header Encoding</td><td id="default-value">UTF-8</td><td id="allowable-values"></td><td id="description">Any message header that is found on a Kafka message will be added to the outbound FlowFile as an attribute. This property indicates the Character Encoding to use for deserializing the headers.</td></tr><tr><td id="name">Headers to Add as Attributes (Regex)</td><td id="def
ault-value"></td><td id="allowable-values"></td><td id="description">A Regular Expression that is matched against all message headers. Any message header whose name matches the regex will be added to the FlowFile as an Attribute. If not specified, no Header values will be added as FlowFile attributes. If two messages have a different value for the same header and that header is selected by the provided regex, then those two messages must be added to different FlowFiles. As a result, users should be cautious about using a regex like ".*" if messages are expected to have header values that are unique per message, such as an identifier or timestamp, because it will prevent NiFi from bundling the messages together efficiently.</td></tr><tr><td id="name">Max Poll Records</td><td id="default-value">10000</td><td id="allowable-values"></td><td id="description">Specifies the maximum number of records Kafka should return in a single poll.</td></tr><tr><td id="name">Max Uncommitted Time</td><
td id="default-value">1 secs</td><td id="allowable-values"></td><td id="description">Specifies the maximum amount of time allowed to pass before offsets must be committed. This value impacts how often offsets will be committed. Committing offsets less often increases throughput but also increases the window of potential data duplication in the event of a rebalance or JVM restart between commits. This value is also related to maximum poll records and the use of a message demarcator. When using a message demarcator we can have far more uncommitted messages than when we're not as there is much less for us to keep track of in memory.</td></tr><tr><td id="name"><strong>Communications Timeout</strong></td><td id="default-value">60 secs</td><td id="allowable-values"></td><td id="description">Specifies the timeout that the consumer should use when communicating with the Kafka Broker</td></tr></table><h3>Dynamic Properties: </h3><p>Dynamic Properties allow the user to specify both the nam
e and value of a property.<table id="dynamic-properties"><tr><th>Name</th><th>Value</th><th>Description</th></tr><tr><td id="name">The name of a Kafka configuration property.</td><td id="value">The value of a given Kafka configuration property.</td><td>These properties will be added on the Kafka configuration after loading any provided configuration properties. In the event a dynamic property represents a property that was already set, its value will be ignored and WARN message logged. For the list of available Kafka properties please refer to: http://kafka.apache.org/documentation.html#configuration.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr></table></p><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>FlowFiles received from Kafka. Depending on demarcation strategy it is a flow file per message or a bundle of messages grouped by topic and parti
tion.</td></tr><tr><td>parse.failure</td><td>If a message from Kafka cannot be parsed using the configured Record Reader, the contents of the message will be routed to this Relationship as its own individual FlowFile.</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3><table id="writes-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>record.count</td><td>The number of records received</td></tr><tr><td>mime.type</td><td>The MIME Type that is provided by the configured Record Writer</td></tr><tr><td>kafka.partition</td><td>The partition of the topic the records are from</td></tr><tr><td>kafka.topic</td><td>The topic records are from</td></tr></table><h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>Input requirement: </h3>This component does not allow an incoming relationship.<h3>System Resource Considerations:</h3>None specified.<h3>See Also:</h3><p><a href="../org.
apache.nifi.processors.kafka.pubsub.ConsumeKafka_2_0/index.html">ConsumeKafka_2_0</a>, <a href="../org.apache.nifi.processors.kafka.pubsub.PublishKafka_2_0/index.html">PublishKafka_2_0</a>, <a href="../org.apache.nifi.processors.kafka.pubsub.PublishKafkaRecord_2_0/index.html">PublishKafkaRecord_2_0</a></p></body></html>
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