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From jsto...@apache.org
Subject svn commit: r1811008 [33/43] - in /nifi/site/trunk/docs: ./ nifi-docs/ nifi-docs/components/ nifi-docs/components/org.apache.nifi/ nifi-docs/components/org.apache.nifi/nifi-ambari-nar/ nifi-docs/components/org.apache.nifi/nifi-ambari-nar/1.4.0/ nifi-do...
Date Tue, 03 Oct 2017 13:30:27 GMT
Added: nifi/site/trunk/docs/nifi-docs/html/getting-started.html
URL: http://svn.apache.org/viewvc/nifi/site/trunk/docs/nifi-docs/html/getting-started.html?rev=1811008&view=auto
==============================================================================
--- nifi/site/trunk/docs/nifi-docs/html/getting-started.html (added)
+++ nifi/site/trunk/docs/nifi-docs/html/getting-started.html Tue Oct  3 13:30:16 2017
@@ -0,0 +1,1630 @@
+<!--
+                        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.
+                        -->
+                        <!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<meta name="generator" content="Asciidoctor 1.5.2">
+<meta name="author" content="Apache NiFi Team">
+<title>Getting Started with Apache NiFi</title>
+<style>
+/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
+/* Copyright (C) 2012-2015 Dan Allen, Ryan Waldron and the Asciidoctor Project
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+</head>
+<body class="article">
+<div id="header">
+<h1>Getting Started with Apache NiFi</h1>
+<div class="details">
+<span id="author" class="author">Apache NiFi Team</span><br>
+<span id="email" class="email"><a href="mailto:dev@nifi.apache.org">dev@nifi.apache.org</a></span><br>
+</div>
+<div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+<ul class="sectlevel1">
+<li><a href="getting-started.html#who-is-this-guide-for">Who is This Guide For?</a></li>
+<li><a href="getting-started.html#terminology-used-in-this-guide">Terminology Used in This Guide</a></li>
+<li><a href="getting-started.html#downloading-and-installing-nifi">Downloading and Installing NiFi</a></li>
+<li><a href="getting-started.html#starting-nifi">Starting NiFi</a>
+<ul class="sectlevel2">
+<li><a href="getting-started.html#for-windows-users">For Windows Users</a></li>
+<li><a href="getting-started.html#for-linux-mac-os-x-users">For Linux/Mac OS X users</a></li>
+<li><a href="getting-started.html#installing-as-a-service">Installing as a Service</a></li>
+</ul>
+</li>
+<li><a href="getting-started.html#i-started-nifi-now-what">I Started NiFi. Now What?</a>
+<ul class="sectlevel2">
+<li><a href="getting-started.html#adding-a-processor">Adding a Processor</a></li>
+<li><a href="getting-started.html#configuring-a-processor">Configuring a Processor</a></li>
+<li><a href="getting-started.html#connecting-processors">Connecting Processors</a></li>
+<li><a href="getting-started.html#starting-and-stopping-processors">Starting and Stopping Processors</a></li>
+<li><a href="getting-started.html#getting-more-info-for-a-processor">Getting More Info for a Processor</a></li>
+<li><a href="getting-started.html#other-components">Other Components</a></li>
+</ul>
+</li>
+<li><a href="getting-started.html#what-processors-are-available">What Processors are Available</a>
+<ul class="sectlevel2">
+<li><a href="getting-started.html#data-transformation">Data Transformation</a></li>
+<li><a href="getting-started.html#routing-and-mediation">Routing and Mediation</a></li>
+<li><a href="getting-started.html#database-access">Database Access</a></li>
+<li><a href="getting-started.html#AttributeExtraction">Attribute Extraction</a></li>
+<li><a href="getting-started.html#system-interaction">System Interaction</a></li>
+<li><a href="getting-started.html#data-ingestion">Data Ingestion</a></li>
+<li><a href="getting-started.html#data-egress-sending-data">Data Egress / Sending Data</a></li>
+<li><a href="getting-started.html#splitting-and-aggregation">Splitting and Aggregation</a></li>
+<li><a href="getting-started.html#http">HTTP</a></li>
+<li><a href="getting-started.html#amazon-web-services">Amazon Web Services</a></li>
+</ul>
+</li>
+<li><a href="getting-started.html#working-with-attributes">Working With Attributes</a>
+<ul class="sectlevel2">
+<li><a href="getting-started.html#common-attributes">Common Attributes</a></li>
+<li><a href="getting-started.html#extracting-attributes">Extracting Attributes</a></li>
+<li><a href="getting-started.html#adding-user-defined-attributes">Adding User-Defined Attributes</a></li>
+<li><a href="getting-started.html#routing-on-attributes">Routing on Attributes</a></li>
+<li><a href="getting-started.html#ExpressionLanguage">Expression Language / Using Attributes in Property Values</a></li>
+</ul>
+</li>
+<li><a href="getting-started.html#custom-properties-within-expression-language">Custom Properties Within Expression Language</a></li>
+<li><a href="getting-started.html#working-with-templates">Working With Templates</a></li>
+<li><a href="getting-started.html#monitoring-nifi">Monitoring NiFi</a>
+<ul class="sectlevel2">
+<li><a href="getting-started.html#status-bar">Status Bar</a></li>
+<li><a href="getting-started.html#component-statistics">Component Statistics</a></li>
+<li><a href="getting-started.html#bulletins">Bulletins</a></li>
+</ul>
+</li>
+<li><a href="getting-started.html#data-provenance">Data Provenance</a>
+<ul class="sectlevel2">
+<li><a href="getting-started.html#EventDetails">Event Details</a></li>
+<li><a href="getting-started.html#lineage-graph">Lineage Graph</a></li>
+</ul>
+</li>
+<li><a href="getting-started.html#where-to-go-for-more-information">Where To Go For More Information</a></li>
+</ul>
+</div>
+</div>
+<div id="content">
+<div class="sect1">
+<h2 id="who-is-this-guide-for"><a class="anchor" href="getting-started.html#who-is-this-guide-for"></a>Who is This Guide For?</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>This guide is written for users who have never used, have had limited exposure to, or only accomplished specific tasks within NiFi.
+This guide is not intended to be an exhaustive instruction manual or a reference guide. The
+<a href="user-guide.html">User Guide</a> provides a great deal of information
+and is intended to be a much more exhaustive resource and is very useful as a reference guide, as well.
+This guide, in comparison, is intended to provide users with just the information needed in order
+to understand how to work with NiFi in order to quickly and easily build powerful and agile dataflows.</p>
+</div>
+<div class="paragraph">
+<p>Because some of the information in this guide is applicable only for first-time users while other
+information may be applicable for those who have used NiFi a bit, this guide is broken up into
+several different sections, some of which may not be useful for some readers. Feel free to jump to
+the sections that are most appropriate for you.</p>
+</div>
+<div class="paragraph">
+<p>This guide does expect that the user has a basic understanding of what NiFi is and does not
+delve into this level of detail. This level of information can be found in the
+<a href="overview.html">Overview</a> documentation.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="terminology-used-in-this-guide"><a class="anchor" href="getting-started.html#terminology-used-in-this-guide"></a>Terminology Used in This Guide</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>In order to talk about NiFi, there are a few key terms that readers should be familiar with.
+We will explain those NiFi-specific terms here, at a high level.</p>
+</div>
+<div class="paragraph">
+<p><strong>FlowFile</strong>: Each piece of "User Data" (i.e., data that the user brings into NiFi for processing and distribution) is
+referred to as a FlowFile. A FlowFile is made up of two parts: Attributes and Content. The Content is the User Data
+itself. Attributes are key-value pairs that are associated with the User Data.</p>
+</div>
+<div class="paragraph">
+<p><strong>Processor</strong>: The Processor is the NiFi component that is responsible for creating, sending, receiving, transforming, routing,
+splitting, merging, and processing FlowFiles. It is the most important building block available to NiFi users to build their
+dataflows.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="downloading-and-installing-nifi"><a class="anchor" href="getting-started.html#downloading-and-installing-nifi"></a>Downloading and Installing NiFi</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>NiFi can be downloaded from the <a href="http://nifi.apache.org/download.html">NiFi Downloads Page</a>. There are two packaging options
+available: a "tarball" that is tailored more to Linux and a zip file that is more applicable for Windows users. Mac OS X users
+may also use the tarball or can install via Homebrew.</p>
+</div>
+<div class="paragraph">
+<p>To install via Homebrew, simply run the command <code>brew install nifi</code>.</p>
+</div>
+<div class="paragraph">
+<p>For users who are not running OS X or do not have Homebrew installed, after downloading the version of NiFi that you
+would like to use simply extract the archive to the location that you wish to run the application from.</p>
+</div>
+<div class="paragraph">
+<p>For information on how to configure the instance of NiFi (for example, to configure security, data storage
+configuration, or the port that NiFi is running on), see the <a href="administration-guide.html">Admin Guide</a>.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="starting-nifi"><a class="anchor" href="getting-started.html#starting-nifi"></a>Starting NiFi</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Once NiFi has been downloaded and installed as described above, it can be started by using the mechanism
+appropriate for your operating system.</p>
+</div>
+<div class="sect2">
+<h3 id="for-windows-users"><a class="anchor" href="getting-started.html#for-windows-users"></a>For Windows Users</h3>
+<div class="paragraph">
+<p>For Windows users, navigate to the folder where NiFi was installed. Within this folder is a subfolder
+named <code>bin</code>. Navigate to this subfolder and double-click the <code>run-nifi.bat</code> file.</p>
+</div>
+<div class="paragraph">
+<p>This will launch NiFi and leave it running in the foreground. To shut down NiFi, select the window that
+was launched and hold the Ctrl key while pressing C.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="for-linux-mac-os-x-users"><a class="anchor" href="getting-started.html#for-linux-mac-os-x-users"></a>For Linux/Mac OS X users</h3>
+<div class="paragraph">
+<p>For Linux and OS X users, use a Terminal window to navigate to the directory where NiFi was installed.
+To run NiFi in the foreground, run <code>bin/nifi.sh run</code>. This will leave the application running until
+the user presses Ctrl-C. At that time, it will initiate shutdown of the application.</p>
+</div>
+<div class="paragraph">
+<p>To run NiFi in the background, instead run <code>bin/nifi.sh start</code>. This will initiate the application to
+begin running. To check the status and see if NiFi is currently running, execute the command <code>bin/nifi.sh status</code>.
+NiFi can be shutdown by executing the command <code>bin/nifi.sh stop</code>.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="installing-as-a-service"><a class="anchor" href="getting-started.html#installing-as-a-service"></a>Installing as a Service</h3>
+<div class="paragraph">
+<p>Currently, installing NiFi as a service is supported only for Linux and Mac OS X users. To install the application
+as a service, navigate to the installation directory in a Terminal window and execute the command <code>bin/nifi.sh install</code>
+to install the service with the default name <code>nifi</code>. To specify a custom name for the service, execute the command
+with an optional second argument that is the name of the service. For example, to install NiFi as a service with the
+name <code>dataflow</code>, use the command <code>bin/nifi.sh install dataflow</code>.</p>
+</div>
+<div class="paragraph">
+<p>Once installed, the service can be started and stopped using the appropriate commands, such as <code>sudo service nifi start</code>
+and <code>sudo service nifi stop</code>. Additionally, the running status can be checked via <code>sudo service nifi status</code>.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="i-started-nifi-now-what"><a class="anchor" href="getting-started.html#i-started-nifi-now-what"></a>I Started NiFi. Now What?</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Now that NiFi has been started, we can bring up the User Interface (UI) in order to create and monitor our dataflow.
+To get started, open a web browser and navigate to <code>http://localhost:8080/nifi</code>. The port can be changed by
+editing the <code>nifi.properties</code> file in the NiFi <code>conf</code> directory, but the default port is 8080.</p>
+</div>
+<div class="paragraph">
+<p>This will bring up the User Interface, which at this point is a blank canvas for orchestrating a dataflow:</p>
+</div>
+<div class="paragraph">
+<p><span class="image"><img src="images/new-flow.png" alt="New Flow"></span></p>
+</div>
+<div class="paragraph">
+<p>The UI has multiple tools to create and manage your first dataflow:</p>
+</div>
+<div class="paragraph">
+<p><span class="image"><img src="images/nifi-toolbar-components.png" alt="Toolbar Components"></span></p>
+</div>
+<div class="paragraph">
+<p>The Global Menu contains the following options:</p>
+</div>
+<div class="paragraph">
+<p><span class="image"><img src="images/global-menu.png" alt="Global Menu"></span></p>
+</div>
+<div class="sect2">
+<h3 id="adding-a-processor"><a class="anchor" href="getting-started.html#adding-a-processor"></a>Adding a Processor</h3>
+<div class="paragraph">
+<p>We can now begin creating our dataflow by adding a Processor to our canvas. To do this, drag the Processor icon
+(<span class="image"><img src="images/iconProcessor.png" alt="Processor"></span>) from the top-left of the screen into the middle of the canvas (the graph paper-like
+background) and drop it there. This will give us a dialog that allows us to choose which Processor we want to add:</p>
+</div>
+<div class="paragraph">
+<p><span class="image"><img src="images/add-processor.png" alt="Add Processor"></span></p>
+</div>
+<div class="paragraph">
+<p>We have quite a few options to choose from. For the sake of becoming oriented with the system, let&#8217;s say that we
+just want to bring in files from our local disk into NiFi. When a developer creates a Processor, the developer can
+assign "tags" to that Processor. These can be thought of as keywords. We can filter by these tags or by Processor
+name by typing into the Filter box in the top-right corner of the dialog. Type in the keywords that you would think
+of when wanting to ingest files from a local disk. Typing in keyword "file", for instance, will provide us a few
+different Processors that deal with files. Filtering by the term "local" will narrow down the list pretty quickly,
+as well. If we select a Processor from the list,
+we will see a brief description of the Processor near the bottom of the dialog. This should tell us exactly what
+the Processor does. The description of the <strong>GetFile</strong> Processor tells us that it pulls data from our local disk
+into NiFi and then removes the local file. We can then double-click the Processor type or select it and choose the
+<code>Add</code> button. The Processor will be added to the canvas in the location that it was dropped.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="configuring-a-processor"><a class="anchor" href="getting-started.html#configuring-a-processor"></a>Configuring a Processor</h3>
+<div class="paragraph">
+<p>Now that we have added the GetFile Processor, we can configure it by right-clicking on the Processor and choosing
+the <code>Configure</code> menu item. The provided dialog allows us to configure many different options that can be read about
+in the <a href="user-guide.html">User Guide</a>, but for the sake of this guide, we will focus on the Properties tab. Once
+the Properties tab has been selected, we are given a list of several different properties that we can configure
+for the Processor. The properties that are available depend on the type of Processor and are generally different
+for each type. Properties that are in bold are required properties. The Processor cannot be started until all required
+properties have been configured. The most important property to configure for GetFile is the directory from which
+to pick up files. If we set the directory name to <code>./data-in</code>, this will cause the Processor to start picking up
+any data in the <code>data-in</code> subdirectory of the NiFi Home directory. We can choose to configure several different
+Properties for this Processor. If unsure what a particular Property does, we can hover over the Help icon (
+<span class="image"><img src="images/iconInfo.png" alt="Help"></span>
+)
+next to the Property Name with the mouse in order to read a description of the property. Additionally, the
+tooltip that is displayed when hovering over the Help icon will provide the default value for that property,
+if one exists, information about whether or not the property supports the Expression Language (see the
+<a href="getting-started.html#ExpressionLanguage">Expression Language / Using Attributes in Property Values</a> section below), and previously configured values for that property.</p>
+</div>
+<div class="paragraph">
+<p>In order for this property to be valid, create a directory named <code>data-in</code> in the NiFi home directory and then
+click the <code>Ok</code> button to close the dialog.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="connecting-processors"><a class="anchor" href="getting-started.html#connecting-processors"></a>Connecting Processors</h3>
+<div class="paragraph">
+<p>Each Processor has a set of defined "Relationships" that it is able to send data to. When a Processor finishes handling
+a FlowFile, it transfers it to one of these Relationships. This allows a user to configure how to handle FlowFiles based
+on the result of Processing. For example, many Processors define two Relationships: <code>success</code> and <code>failure</code>. Users are
+then able to configure data to be routed through the flow one way if the Processor is able to successfully process
+the data and route the data through the flow in a completely different manner if the Processor cannot process the
+data for some reason. Or, depending on the use case, it may simply route both relationships to the same route through
+the flow.</p>
+</div>
+<div class="paragraph">
+<p>Now that we have added and configured our GetFile processor and applied the configuration, we can see in the
+top-left corner of the Processor an Alert icon (
+<span class="image"><img src="images/iconAlert.png" alt="Alert"></span>
+) signaling that the Processor is not in a valid state. Hovering over this icon, we can see that the <code>success</code>
+relationship has not been defined. This simply means that we have not told NiFi what to do with the data that the Processor
+transfers to the <code>success</code> Relationship.</p>
+</div>
+<div class="paragraph">
+<p>In order to address this, let&#8217;s add another Processor that we can connect the GetFile Processor to, by following
+the same steps above. This time, however, we will simply log the attributes that exist for the FlowFile. To do this,
+we will add a LogAttributes Processor.</p>
+</div>
+<div class="paragraph">
+<p>We can now send the output of the GetFile Processor to the LogAttribute Processor. Hover over the GetFile Processor
+with the mouse and a Connection Icon (
+<span class="image"><img src="images/iconConnection.png" alt="Connection"></span>
+) will appear over the middle of the Processor. We can drag this icon from the GetFile Processor to the LogAttribute
+Processor. This gives us a dialog to choose which Relationships we want to include for this connection. Because GetFile
+has only a single Relationship, <code>success</code>, it is automatically selected for us.</p>
+</div>
+<div class="paragraph">
+<p>Clicking on the Settings tab provides a handful of options for configuring how this Connection should behave:</p>
+</div>
+<div class="paragraph">
+<p><span class="image"><img src="images/connection-settings.png" alt="Connection Settings"></span></p>
+</div>
+<div class="paragraph">
+<p>We can give the Connection a name, if we like. Otherwise, the Connection name will be based on the selected Relationships.
+We can also set an expiration for the data. By default, it is set to "0 sec" which indicates that the data should not
+expire. However, we can change the value so that when data in this Connection reaches a certain age, it will automatically
+be deleted (and a corresponding EXPIRE Provenance event will be created).</p>
+</div>
+<div class="paragraph">
+<p>The backpressure thresholds allow us to specify how full the queue is allowed to become before the source Processor is
+no longer scheduled to run. This allows us to handle cases where one Processor is capable of producing data faster than
+the next Processor is capable of consuming that data. If the backpressure is configured for each Connection along the way,
+the Processor that is bringing data into the system will eventually experience the backpressure and stop bringing in new
+data so that our system has the ability to recover.</p>
+</div>
+<div class="paragraph">
+<p>Finally, we have the Prioritizers on the right-hand side. This allows us to control how the data in this queue is ordered.
+We can drag Prioritizers from the "Available prioritizers" list to the "Selected prioritizers" list in order to activate
+the prioritizer. If multiple prioritizers are activated, they will be evaluated such that the Prioritizer listed first
+will be evaluated first and if two FlowFiles are determined to be equal according to that Prioritizer, the second Prioritizer
+will be used.</p>
+</div>
+<div class="paragraph">
+<p>For the sake of this discussion, we can simply click <code>Add</code> to add the Connection to our graph. We should now see that the Alert
+icon has changed to a Stopped icon (
+<span class="image"><img src="images/iconStop.png" alt="Stopped"></span>
+). The LogAttribute Processor, however, is now invalid because its <code>success</code> Relationship has not been connected to
+anything. Let&#8217;s address this by signaling that data that is routed to <code>success</code> by LogAttribute should be "Auto Terminated,"
+meaning that NiFi should consider the FlowFile&#8217;s processing complete and "drop" the data. To do this, we configure the
+LogAttribute Processor. On the Settings tab, in the right-hand side we can check the box next to the <code>success</code> Relationship
+to Auto Terminate the data. Clicking <code>OK</code> will close the dialog and show that both Processors are now stopped.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="starting-and-stopping-processors"><a class="anchor" href="getting-started.html#starting-and-stopping-processors"></a>Starting and Stopping Processors</h3>
+<div class="paragraph">
+<p>At this point, we have two Processors on our graph, but nothing is happening. In order to start the Processors, we can
+click on each one individually and then right-click and choose the <code>Start</code> menu item. Alternatively, we can select the first
+Processor, and then hold the Shift key while selecting the other Processor in order to select both. Then, we can
+right-click and choose the <code>Start</code> menu item. As an alternative to using the context menu, we can select the Processors and
+then click the Start icon in the Operate palette.</p>
+</div>
+<div class="paragraph">
+<p>Once started, the icon in the top-left corner of the Processors will change from a stopped icon to a running icon. We can then
+stop the Processors by using the Stop icon in the Operate palette or the <code>Stop</code> menu item.</p>
+</div>
+<div class="paragraph">
+<p>Once a Processor has started, we are not able to configure it anymore. Instead, when we right-click on the Processor, we are
+given the option to view its current configuration. In order to configure a Processor, we must first stop the Processor and
+wait for any tasks that may be executing to finish. The number of tasks currently executing is shown near the top-right
+corner of the Processor, but nothing is shown there if there are currently no tasks.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="getting-more-info-for-a-processor"><a class="anchor" href="getting-started.html#getting-more-info-for-a-processor"></a>Getting More Info for a Processor</h3>
+<div class="paragraph">
+<p>With each Processor having the ability to expose multiple different Properties and Relationships, it can be challenging
+to remember how all of the different pieces work for each Processor. To address this, you are able to right-click
+on a Processor and choose the <code>Usage</code> menu item. This will provide you with the Processor&#8217;s usage information, such as a
+description of the Processor, the different Relationships that are available, when the different Relationships are used,
+Properties that are exposed by the Processor and their documentation, as well as which FlowFile Attributes (if any) are
+expected on incoming FlowFiles and which Attributes (if any) are added to outgoing FlowFiles.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="other-components"><a class="anchor" href="getting-started.html#other-components"></a>Other Components</h3>
+<div class="paragraph">
+<p>The toolbar that provides users the ability to drag and drop Processors onto the graph includes several other components
+that can be used to build a dataflow. These components include Input and Output Ports, Funnels, Process Groups, and Remote
+Process Groups. Due to the intended scope of this document, we will not discuss these elements here, but information is
+readily available in the <a href="user-guide.html#building-dataflow">Building a Dataflow section</a> of the
+<a href="user-guide.html">User Guide</a>.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="what-processors-are-available"><a class="anchor" href="getting-started.html#what-processors-are-available"></a>What Processors are Available</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>In order to create an effective dataflow, the users must understand what types of Processors are available to them.
+NiFi contains many different Processors out of the box. These Processors provide capabilities to ingest data from
+numerous different systems, route, transform, process, split, and aggregate data, and distribute data to many systems.</p>
+</div>
+<div class="paragraph">
+<p>The number of Processors that are available increases in nearly each release of NiFi. As a result, we will not attempt
+to name each of the Processors that are available, but we will highlight some of the most frequently used Processors,
+categorizing them by their functions.</p>
+</div>
+<div class="sect2">
+<h3 id="data-transformation"><a class="anchor" href="getting-started.html#data-transformation"></a>Data Transformation</h3>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>CompressContent</strong>: Compress or Decompress Content</p>
+</li>
+<li>
+<p><strong>ConvertCharacterSet</strong>: Convert the character set used to encode the content from one character set to another</p>
+</li>
+<li>
+<p><strong>EncryptContent</strong>: Encrypt or Decrypt Content</p>
+</li>
+<li>
+<p><strong>ReplaceText</strong>: Use Regular Expressions to modify textual Content</p>
+</li>
+<li>
+<p><strong>TransformXml</strong>: Apply an XSLT transform to XML Content</p>
+</li>
+<li>
+<p><strong>JoltTransformJSON</strong>: Apply a JOLT specification to transform JSON Content</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="routing-and-mediation"><a class="anchor" href="getting-started.html#routing-and-mediation"></a>Routing and Mediation</h3>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>ControlRate</strong>: Throttle the rate at which data can flow through one part of the flow</p>
+</li>
+<li>
+<p><strong>DetectDuplicate</strong>: Monitor for duplicate FlowFiles, based on some user-defined criteria. Often used in conjunction
+with HashContent</p>
+</li>
+<li>
+<p><strong>DistributeLoad</strong>: Load balance or sample data by distributing only a portion of data to each user-defined Relationship</p>
+</li>
+<li>
+<p><strong>MonitorActivity</strong>: Sends a notification when a user-defined period of time elapses without any data coming through a particular
+point in the flow. Optionally send a notification when dataflow resumes.</p>
+</li>
+<li>
+<p><strong>RouteOnAttribute</strong>: Route FlowFile based on the attributes that it contains.</p>
+</li>
+<li>
+<p><strong>ScanAttribute</strong>: Scans the user-defined set of Attributes on a FlowFile, checking to see if any of the Attributes match the terms
+found in a user-defined dictionary.</p>
+</li>
+<li>
+<p><strong>RouteOnContent</strong>: Search Content of a FlowFile to see if it matches any user-defined Regular Expression. If so, the FlowFile is
+routed to the configured Relationship.</p>
+</li>
+<li>
+<p><strong>ScanContent</strong>: Search Content of a FlowFile for terms that are present in a user-defined dictionary and route based on the
+presence or absence of those terms. The dictionary can consist of either textual entries or binary entries.</p>
+</li>
+<li>
+<p><strong>ValidateXml</strong>: Validation XML Content against an XML Schema; routes FlowFile based on whether or not the Content of the FlowFile
+is valid according to the user-defined XML Schema.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="database-access"><a class="anchor" href="getting-started.html#database-access"></a>Database Access</h3>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>ConvertJSONToSQL</strong>: Convert a JSON document into a SQL INSERT or UPDATE command that can then be passed to the PutSQL Processor</p>
+</li>
+<li>
+<p><strong>ExecuteSQL</strong>: Executes a user-defined SQL SELECT command, writing the results to a FlowFile in Avro format</p>
+</li>
+<li>
+<p><strong>PutSQL</strong>: Updates a database by executing the SQL DDM statement defined by the FlowFile&#8217;s content</p>
+</li>
+<li>
+<p><strong>SelectHiveQL</strong>: Executes a user-defined HiveQL SELECT command against an Apache Hive database, writing the results to a FlowFile in Avro or CSV format</p>
+</li>
+<li>
+<p><strong>PutHiveQL</strong>: Updates a Hive database by executing the HiveQL DDM statement defined by the FlowFile&#8217;s content</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="AttributeExtraction"><a class="anchor" href="getting-started.html#AttributeExtraction"></a>Attribute Extraction</h3>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>EvaluateJsonPath</strong>: User supplies JSONPath Expressions (Similar to XPath, which is used for XML parsing/extraction), and these Expressions
+are then evaluated against the JSON Content to either replace the FlowFile Content or extract the value into the user-named Attribute.</p>
+</li>
+<li>
+<p><strong>EvaluateXPath</strong>: User supplies XPath Expressions, and these Expressions are then evaluated against the XML Content to either
+replace the FlowFile Content or extract the value into the user-named Attribute.</p>
+</li>
+<li>
+<p><strong>EvaluateXQuery</strong>: User supplies an XQuery query, and this query is then evaluated against the XML Content to either replace the FlowFile
+Content or extract the value into the user-named Attribute.</p>
+</li>
+<li>
+<p><strong>ExtractText</strong>: User supplies one or more Regular Expressions that are then evaluated against the textual content of the FlowFile, and the
+values that are extracted are then added as user-named Attributes.</p>
+</li>
+<li>
+<p><strong>HashAttribute</strong>: Performs a hashing function against the concatenation of a user-defined list of existing Attributes.</p>
+</li>
+<li>
+<p><strong>HashContent</strong>: Performs a hashing function against the content of a FlowFile and adds the hash value as an Attribute.</p>
+</li>
+<li>
+<p><strong>IdentifyMimeType</strong>: Evaluates the content of a FlowFile in order to determine what type of file the FlowFile encapsulates. This Processor is
+capable of detecting many different MIME Types, such as images, word processor documents, text, and compression formats just to name
+  a few.</p>
+</li>
+<li>
+<p><strong>UpdateAttribute</strong>: Adds or updates any number of user-defined Attributes to a FlowFile. This is useful for adding statically configured values,
+as well as deriving Attribute values dynamically by using the Expression Language. This processor also provides an "Advanced User Interface,"
+  allowing users to update Attributes conditionally, based on user-supplied rules.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="system-interaction"><a class="anchor" href="getting-started.html#system-interaction"></a>System Interaction</h3>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>ExecuteProcess</strong>: Runs the user-defined Operating System command. The Process&#8217;s StdOut is redirected such that the content that is written
+to StdOut becomes the content of the outbound FlowFile. This Processor is a Source Processor - its output is expected to generate a new FlowFile,
+  and the system call is expected to receive no input. In order to provide input to the process, use the ExecuteStreamCommand Processor.</p>
+</li>
+<li>
+<p><strong>ExecuteStreamCommand</strong>: Runs the user-defined Operating System command. The contents of the FlowFile are optionally streamed to the StdIn
+of the process. The content that is written to StdOut becomes the content of hte outbound FlowFile. This Processor cannot be used a Source Processor -
+  it must be fed incoming FlowFiles in order to perform its work. To perform the same type of functionality with a Source Processor, see the
+  ExecuteProcess Processor.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="data-ingestion"><a class="anchor" href="getting-started.html#data-ingestion"></a>Data Ingestion</h3>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>GetFile</strong>: Streams the contents of a file from a local disk (or network-attached disk) into NiFi and then deletes the original file. This
+Processor is expected to move the file from one location to another location and is not to be used for copying the data.</p>
+</li>
+<li>
+<p><strong>GetFTP</strong>: Downloads the contents of a remote file via FTP into NiFi and then deletes the original file. This Processor is expected to move
+the data from one location to another location and is not to be used for copying the data.</p>
+</li>
+<li>
+<p><strong>GetSFTP</strong>: Downloads the contents of a remote file via SFTP into NiFi and then deletes the original file. This Processor is expected to move
+the data from one location to another location and is not to be used for copying the data.</p>
+</li>
+<li>
+<p><strong>GetJMSQueue</strong>: Downloads a message from a JMS Queue and creates a FlowFile based on the contents of the JMS message. The JMS Properties are
+optionally copied over as Attributes, as well.</p>
+</li>
+<li>
+<p><strong>GetJMSTopic</strong>: Downloads a message from a JMS Topic and creates a FlowFile based on the contents of the JMS message. The JMS Properties are
+optionally copied over as Attributes, as well. This Processor supports both durable and non-durable subscriptions.</p>
+</li>
+<li>
+<p><strong>GetHTTP</strong>: Downloads the contents of a remote HTTP- or HTTPS-based URL into NiFi. The Processor will remember the ETag and Last-Modified Date
+in order to ensure that the data is not continually ingested.</p>
+</li>
+<li>
+<p><strong>ListenHTTP</strong>: Starts an HTTP (or HTTPS) Server and listens for incoming connections. For any incoming POST request, the contents of the request
+are written out as a FlowFile, and a 200 response is returned.</p>
+</li>
+<li>
+<p><strong>ListenUDP</strong>: Listens for incoming UDP packets and creates a FlowFile per packet or per bundle of packets (depending on configuration) and
+emits the FlowFile to the <em>success</em> relationship.</p>
+</li>
+<li>
+<p><strong>GetHDFS</strong>: Monitors a user-specified directory in HDFS. Whenever a new file enters HDFS, it is copied into NiFi and deleted from HDFS. This
+Processor is expected to move the file from one location to another location and is not to be used for copying the data. This Processor is also
+  expected to be run On Primary Node only, if run within a cluster. In order to copy the data from HDFS and leave it in-tact, or to stream the data
+  from multiple nodes in the cluster, see the ListHDFS Processor.</p>
+</li>
+<li>
+<p><strong>ListHDFS</strong> / <strong>FetchHDFS</strong>: ListHDFS monitors a user-specified directory in HDFS and emits a FlowFile containing the filename for each file that it
+encounters. It then persists this state across the entire NiFi cluster by way of a Distributed Cache. These FlowFiles can then be fanned out across
+  the cluster and sent to the FetchHDFS Processor, which is responsible for fetching the actual content of those files and emitting FlowFiles that contain
+  the content fetched from HDFS.</p>
+</li>
+<li>
+<p><strong>FetchS3Object</strong>: Fetches the contents of an object from the Amazon Web Services (AWS) Simple Storage Service (S3). The outbound FlowFile contains the contents
+received from S3.</p>
+</li>
+<li>
+<p><strong>GetKafka</strong>: Fetches messages from Apache Kafka, specifically for 0.8.x versions. The messages can be emitted as a FlowFile per message or can be batched together using a user-specified delimiter.</p>
+</li>
+<li>
+<p><strong>GetMongo</strong>: Executes a user-specified query against MongoDB and writes the contents to a new FlowFile.</p>
+</li>
+<li>
+<p><strong>GetTwitter</strong>: Allows Users to register a filter to listen to the Twitter "garden hose" or Enterprise endpoint, creating a FlowFile for each tweet
+that is received.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="data-egress-sending-data"><a class="anchor" href="getting-started.html#data-egress-sending-data"></a>Data Egress / Sending Data</h3>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>PutEmail</strong>: Sends an E-mail to the configured recipients. The content of the FlowFile is optionally sent as an attachment.</p>
+</li>
+<li>
+<p><strong>PutFile</strong>: Writes the contents of a FlowFile to a directory on the local (or network attached) file system.</p>
+</li>
+<li>
+<p><strong>PutFTP</strong>: Copies the contents of a FlowFile to a remote FTP Server.</p>
+</li>
+<li>
+<p><strong>PutSFTP</strong>: Copies the contents of a FlowFile to a remote SFTP Server.</p>
+</li>
+<li>
+<p><strong>PutJMS</strong>: Sends the contents of a FlowFile as a JMS message to a JMS broker, optionally adding JMS Properties based on Attributes.</p>
+</li>
+<li>
+<p><strong>PutSQL</strong>: Executes the contents of a FlowFile as a SQL DDL Statement (INSERT, UPDATE, or DELETE). The contents of the FlowFile must be a valid
+SQL statement. Attributes can be used as parameters so that the contents of the FlowFile can be parameterized SQL statements in order to avoid
+  SQL injection attacks.</p>
+</li>
+<li>
+<p><strong>PutKafka</strong>: Sends the contents of a FlowFile as a message to Apache Kafka, specifically for 0.8.x versions. The FlowFile can be sent as a single message or a delimiter, such as a
+new-line can be specified, in order to send many messages for a single FlowFile.</p>
+</li>
+<li>
+<p><strong>PutMongo</strong>: Sends the contents of a FlowFile to Mongo as an INSERT or an UPDATE.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="splitting-and-aggregation"><a class="anchor" href="getting-started.html#splitting-and-aggregation"></a>Splitting and Aggregation</h3>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>SplitText</strong>: SplitText takes in a single FlowFile whose contents are textual and splits it into 1 or more FlowFiles based on the configured
+number of lines. For example, the Processor can be configured to split a FlowFile into many FlowFiles, each of which is only 1 line.</p>
+</li>
+<li>
+<p><strong>SplitJson</strong>: Allows the user to split a JSON object that is comprised of an array or many child objects into a FlowFile per JSON element.</p>
+</li>
+<li>
+<p><strong>SplitXml</strong>: Allows the user to split an XML message into many FlowFiles, each containing a segment of the original. This is generally used when
+several XML elements have been joined together with a "wrapper" element. This Processor then allows those elements to be split out into individual
+  XML elements.</p>
+</li>
+<li>
+<p><strong>UnpackContent</strong>: Unpacks different types of archive formats, such as ZIP and TAR. Each file within the archive is then transferred as a single
+FlowFile.</p>
+</li>
+<li>
+<p><strong>MergeContent</strong>: This Processor is responsible for merging many FlowFiles into a single FlowFile. The FlowFiles can be merged by concatenating their
+content together along with optional header, footer, and demarcator, or by specifying an archive format, such as ZIP or TAR. FlowFiles can be binned
+  together based on a common attribute, or can be "defragmented" if they were split apart by some other Splitting process. The minimum and maximum
+  size of each bin is user-specified, based on number of elements or total size of FlowFiles' contents, and an optional Timeout can be assigned as well
+  so that FlowFiles will only wait for their bin to become full for a certain amount of time.</p>
+</li>
+<li>
+<p><strong>SegmentContent</strong>: Segments a FlowFile into potentially many smaller FlowFiles based on some configured data size. The splitting is not performed
+against any sort of demarcator but rather just based on byte offsets. This is used before transmitting FlowFiles in order to provide lower latency
+  by sending many different pieces in parallel. On the other side, these FlowFiles can then be reassembled by the MergeContent processor using the
+  Defragment mode.</p>
+</li>
+<li>
+<p><strong>SplitContent</strong>: Splits a single FlowFile into potentially many FlowFiles, similarly to SegmentContent. However, with SplitContent, the splitting
+is not performed on arbitrary byte boundaries but rather a byte sequence is specified on which to split the content.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="http"><a class="anchor" href="getting-started.html#http"></a>HTTP</h3>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>GetHTTP</strong>: Downloads the contents of a remote HTTP- or HTTPS-based URL into NiFi. The Processor will remember the ETag and Last-Modified Date
+in order to ensure that the data is not continually ingested.</p>
+</li>
+<li>
+<p><strong>ListenHTTP</strong>: Starts an HTTP (or HTTPS) Server and listens for incoming connections. For any incoming POST request, the contents of the request
+are written out as a FlowFile, and a 200 response is returned.</p>
+</li>
+<li>
+<p><strong>InvokeHTTP</strong>: Performs an HTTP Request that is configured by the user. This Processor is much more versatile than the GetHTTP and PostHTTP
+but requires a bit more configuration. This Processor cannot be used as a Source Processor and is required to have incoming FlowFiles in order
+  to be triggered to perform its task.</p>
+</li>
+<li>
+<p><strong>PostHTTP</strong>: Performs an HTTP POST request, sending the contents of the FlowFile as the body of the message. This is often used in conjunction
+with ListenHTTP in order to transfer data between two different instances of NiFi in cases where Site-to-Site cannot be used (for instance,
+  when the nodes cannot access each other directly and are able to communicate through an HTTP proxy).
+  <strong>Note</strong>: HTTP is available as a <a href="user-guide.html#site-to-site">Site-to-Site</a> transport protocol in addition to the existing RAW socket transport. It also supports HTTP Proxy. Using HTTP Site-to-Site is recommended since it&#8217;s more scalable, and can provide bi-directional data transfer using input/output ports with better user authentication and authorization.</p>
+</li>
+<li>
+<p><strong>HandleHttpRequest</strong> / <strong>HandleHttpResponse</strong>: The HandleHttpRequest Processor is a Source Processor that starts an embedded HTTP(S) server
+similarly to ListenHTTP. However, it does not send a response to the client. Instead, the FlowFile is sent out with the body of the HTTP request
+  as its contents and attributes for all of the typical Servlet parameters, headers, etc. as Attributes. The HandleHttpResponse then is able to
+  send a response back to the client after the FlowFile has finished being processed. These Processors are always expected to be used in conjunction
+  with one another and allow the user to visually create a Web Service within NiFi. This is particularly useful for adding a front-end to a non-web-
+based protocol or to add a simple web service around some functionality that is already performed by NiFi, such as data format conversion.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="amazon-web-services"><a class="anchor" href="getting-started.html#amazon-web-services"></a>Amazon Web Services</h3>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>FetchS3Object</strong>: Fetches the content of an object stored in Amazon Simple Storage Service (S3). The content that is retrieved from S3
+is then written to the content of the FlowFile.</p>
+</li>
+<li>
+<p><strong>PutS3Object</strong>: Writes the contents of a FlowFile to an Amazon S3 object using the configured credentials, key, and bucket name.</p>
+</li>
+<li>
+<p><strong>PutSNS</strong>: Sends the contents of a FlowFile as a notification to the Amazon Simple Notification Service (SNS).</p>
+</li>
+<li>
+<p><strong>GetSQS</strong>: Pulls a message from the Amazon Simple Queuing Service (SQS) and writes the contents of the message to the content of the FlowFile.</p>
+</li>
+<li>
+<p><strong>PutSQS</strong>: Sends the contents of a FlowFile as a message to the Amazon Simple Queuing Service (SQS).</p>
+</li>
+<li>
+<p><strong>DeleteSQS</strong>: Deletes a message from the Amazon Simple Queuing Service (SQS). This can be used in conjunction with the GetSQS in order to receive
+a message from SQS, perform some processing on it, and then delete the object from the queue only after it has successfully completed processing.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="working-with-attributes"><a class="anchor" href="getting-started.html#working-with-attributes"></a>Working With Attributes</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Each FlowFile is created with several Attributes, and these Attributes will change over the life of
+the FlowFile. The concept of a FlowFile is extremely powerful and provides three primary benefits.
+First, it allows the user to make routing decisions in the flow so that FlowFiles that meet some criteria
+can be handled differently than other FlowFiles. This is done using the RouteOnAttribute and similar Processors.</p>
+</div>
+<div class="paragraph">
+<p>Secondly, Attributes are used in order to configure Processors in such a way that the configuration of the
+Processor is dependent on the data itself. For instance, the PutFile Processor is able to use the Attributes in order
+to know where to store each FlowFile, while the directory and filename Attributes may be different for each FlowFile.</p>
+</div>
+<div class="paragraph">
+<p>Finally, the Attributes provide extremely valuable context about the data. This is useful when reviewing the Provenance
+data for a FlowFile. This allows the user to search for Provenance data that match specific criteria, and it also allows
+the user to view this context when inspecting the details of a Provenance Event. By doing this, the user is then able
+to gain valuable insight as to why the data was processed one way or another, simply by glancing at this context that is
+carried along with the content.</p>
+</div>
+<div class="sect2">
+<h3 id="common-attributes"><a class="anchor" href="getting-started.html#common-attributes"></a>Common Attributes</h3>
+<div class="paragraph">
+<p>Each FlowFile has a minimum set of Attributes:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>filename</strong>: A filename that can be used to store the data to a local or remote file system.</p>
+</li>
+<li>
+<p><strong>path</strong>: The name of a directory that can be used to store the data to a local or remote file system.</p>
+</li>
+<li>
+<p><strong>uuid</strong>: A Universally Unique Identifier that distinguishes the FlowFile from other FlowFiles in the system.</p>
+</li>
+<li>
+<p><strong>entryDate</strong>: The date and time at which the FlowFile entered the system (i.e., was created). The value of this
+attribute is a number that represents the number of milliseconds since midnight, Jan. 1, 1970 (UTC).</p>
+</li>
+<li>
+<p><strong>lineageStartDate</strong>: Any time that a FlowFile is cloned, merged, or split, this results in a "child" FlowFile being
+created. As those children are then cloned, merged, or split, a chain of ancestors is built. This value represents
+the date and time at which the oldest ancestor entered the system. Another way to think about this is that this
+attribute represents the latency of the FlowFile through the system. The value is a number that represents the number
+of milliseconds since midnight, Jan. 1, 1970 (UTC).</p>
+</li>
+<li>
+<p><strong>fileSize</strong>: This attribute represents the number of bytes taken up by the FlowFile&#8217;s Content.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>Note that the <code>uuid</code>, <code>entryDate</code>, <code>lineageStartDate</code>, and <code>fileSize</code> attributes are system-generated and cannot be changed.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="extracting-attributes"><a class="anchor" href="getting-started.html#extracting-attributes"></a>Extracting Attributes</h3>
+<div class="paragraph">
+<p>NiFi provides several different Processors out of the box for extracting Attributes from FlowFiles. A list of commonly used
+Processors for this purpose can be found above in the <a href="getting-started.html#AttributeExtraction">Attribute Extraction</a> section. This is a very common use case for building
+custom Processors, as well. Many Processors are written to understand a specific data format and extract pertinent information from
+a FlowFile&#8217;s content, creating Attributes to hold that information, so that decisions can then be made about how to route or
+process the data.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="adding-user-defined-attributes"><a class="anchor" href="getting-started.html#adding-user-defined-attributes"></a>Adding User-Defined Attributes</h3>
+<div class="paragraph">
+<p>In addition to having Processors that are able to extract particular pieces of information from FlowFile content into Attributes,
+it is also common for users to want to add their own user-defined Attributes to each FlowFile at a particular place in the flow.
+The UpdateAttribute Processor is designed specifically for this purpose. Users are able to add a new property to the Processor
+in the Configure dialog by clicking the "+" button in the top-right corner of the Properties tab. The user is then
+prompted to enter the name of the property and then a value. For each FlowFile that is processed by this UpdateAttribute
+Processor, an Attribute will be added for each user-defined property. The name of the Attribute will be the same as the name of
+the property that was added. The value of the Attribute will be the same as the value of the property.</p>
+</div>
+<div class="paragraph">
+<p>The value of the property may contain the Expression Language, as well. This allows Attributes to be modified or added
+based on other Attributes. For example, if we want to prepend the hostname that is processing a file as well as the date to
+a filename, we could do this by adding a property with the name <code>filename</code> and the value <code>${hostname()}-${now():format('yyyy-dd-MM')}-${filename}</code>.
+While this may seem confusing at first, the section below on <a href="getting-started.html#ExpressionLanguage">Expression Language / Using Attributes in Property Values</a> will help to clear up what is going on
+here.</p>
+</div>
+<div class="paragraph">
+<p>In addition to always adding a defined set of Attributes, the UpdateAttribute Processor has an Advanced UI that allows the user
+to configure a set of rules for which Attributes should be added when. To access this capability, in the Configure dialog&#8217;s
+Properties tab, click the <code>Advanced</code> button at the bottom of the dialog. This will provide a UI that is tailored specifically
+to this Processor, rather than the simple Properties table that is provided for all Processors. Within this UI, the user is able
+to configure a rules engine, essentially, specifying rules that must match in order to have the configured Attributes added
+to the FlowFile.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="routing-on-attributes"><a class="anchor" href="getting-started.html#routing-on-attributes"></a>Routing on Attributes</h3>
+<div class="paragraph">
+<p>One of the most powerful features of NiFi is the ability to route FlowFiles based on their Attributes. The primary mechanism
+for doing this is the RouteOnAttribute Processor. This Processor, like UpdateAttribute, is configured by adding user-defined properties.
+Any number of properties can be added by clicking the "+" button in the top-right corner of the Properties tab in the
+Processor&#8217;s Configure dialog.</p>
+</div>
+<div class="paragraph">
+<p>Each FlowFile&#8217;s Attributes will be compared against the configured properties to determine whether or not the FlowFile meets the
+specified criteria. The value of each property is expected to be an Expression Language expression and return a boolean value.
+For more on the Expression Language, see the <a href="getting-started.html#ExpressionLanguage">Expression Language / Using Attributes in Property Values</a> section below.</p>
+</div>
+<div class="paragraph">
+<p>After evaluating the Expression Language expressions provided against the FlowFile&#8217;s Attributes, the Processor determines how to
+route the FlowFile based on the Routing Strategy selected. The most common strategy is the "Route to Property name" strategy. With this
+strategy selected, the Processor will expose a Relationship for each property configured. If the FlowFile&#8217;s Attributes satisfy the given
+expression, a copy of the FlowFile will be routed to the corresponding Relationship. For example, if we had a new property with the name
+"begins-with-r" and the value "${filename:startsWith('r')}" then any FlowFile whose filename starts with the letter <em>r</em> will be routed
+to that Relationship. All other FlowFiles will be routed to <em>unmatched</em>.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="ExpressionLanguage"><a class="anchor" href="getting-started.html#ExpressionLanguage"></a>Expression Language / Using Attributes in Property Values</h3>
+<div class="paragraph">
+<p>As we extract Attributes from FlowFiles' contents and add user-defined Attributes, they don&#8217;t do us much good as an operator unless
+we have some mechanism by which we can use them. The NiFi Expression Language allows us to access and manipulate FlowFile Attribute
+values as we configure our flows. Not all Processor properties allow the Expression Language to be used, but many do. In order to
+determine whether or not a property supports the Expression Language, a user can hover over the Help icon (
+<span class="image"><img src="images/iconInfo.png" alt="Help"></span>
+) in the Properties tab of the Processor Configure dialog. This will provide a tooltip that shows a description of the property, the
+default value, if any, and whether or not the property supports the Expression Language.</p>
+</div>
+<div class="paragraph">
+<p>For properties that do support the Expression Language, it is used by adding an expression within the opening <code>${</code> tag and the closing
+<code>}</code> tag. An expression can be as simple as an attribute name. For example, to reference the <code>uuid</code> Attribute, we can simply use the
+value <code>${uuid}</code>. If the Attribute name begins with any character other than a letter, or if it contains a character other than
+a number, a letter, a period (.), or an underscore (_), the Attribute name will need to be quoted. For example, <code>${My Attribute Name}</code>
+will be invalid, but <code>${'My Attribute Name'}</code> will refer to the Attribute <code>My Attribute Name</code>.</p>
+</div>
+<div class="paragraph">
+<p>In addition to referencing Attribute values, we can perform a number of functions and comparisons on those Attributes. For example,
+if we want to check if the <code>filename</code> attribute contains the letter <em>r</em> without paying attention to case (upper case or lower case),
+we can do this by using the expression <code>${filename:toLower():contains('r')}</code>. Note here that the functions are separated by colons.

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