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Posted to commits@nifi.apache.org by jo...@apache.org on 2014/12/31 18:23:18 UTC
svn commit: r1648743 [4/4] - in /incubator/nifi/site/trunk/content/docs:
nifi-docs/ nifi-docs/images/ user-guide/ user-guide/images/
Modified: incubator/nifi/site/trunk/content/docs/user-guide/nifi-user-guide.html
URL: http://svn.apache.org/viewvc/incubator/nifi/site/trunk/content/docs/user-guide/nifi-user-guide.html?rev=1648743&r1=1648742&r2=1648743&view=diff
==============================================================================
--- incubator/nifi/site/trunk/content/docs/user-guide/nifi-user-guide.html (original)
+++ incubator/nifi/site/trunk/content/docs/user-guide/nifi-user-guide.html Wed Dec 31 17:23:17 2014
@@ -18,413 +18,6 @@ limitations under the License.
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@@ -436,921 +29,7 @@ body.book #toc,body.book #preamble,body.
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</head>
-<body class="article">
-<div id="header">
-<h1>NiFi User Guide (Draft - Preview Version)</h1>
-<div class="details">
-<span id="author" class="author">Apache NiFi Team</span><br>
-</div>
-<div id="toc" class="toc">
-<div id="toctitle">Table of Contents</div>
-<ul class="sectlevel1">
-<li><a href="#terminology">Terminology</a></li>
-<li><a href="#_nifi_user_interface">NiFi User Interface</a></li>
-<li><a href="#_building_a_dataflow">Building a DataFlow</a>
-<ul class="sectlevel2">
-<li><a href="#_adding_components_to_the_canvas">Adding Components to the Canvas</a></li>
-<li><a href="#_configuring_a_processor">Configuring a Processor</a></li>
-<li><a href="#_additional_help">Additional Help</a></li>
-<li><a href="#_connecting_components">Connecting Components</a></li>
-<li><a href="#_processor_validation">Processor Validation</a></li>
-</ul>
-</li>
-<li><a href="#_command_and_control_of_dataflow">Command and Control of DataFlow</a>
-<ul class="sectlevel2">
-<li><a href="#_starting_a_component">Starting a Component</a></li>
-<li><a href="#_stopping_a_component">Stopping a Component</a></li>
-<li><a href="#_enabling_disabling_a_component">Enabling/Disabling a Component</a></li>
-<li><a href="#_remote_process_group_transmission">Remote Process Group Transmission</a></li>
-</ul>
-</li>
-<li><a href="#monitoring">Monitoring of DataFlow</a>
-<ul class="sectlevel2">
-<li><a href="#processor_anatomy">Anatomy of a Processor</a></li>
-<li><a href="#process_group_anatomy">Anatomy of a Process Group</a></li>
-<li><a href="#remote_group_anatomy">Anatomy of a Remote Process Group</a></li>
-<li><a href="#_status_page">Status Page</a></li>
-<li><a href="#_historical_statics_of_a_component">Historical Statics of a Component</a></li>
-</ul>
-</li>
-<li><a href="#_templates">Templates</a>
-<ul class="sectlevel2">
-<li><a href="#_creating_a_template">Creating a Template</a></li>
-<li><a href="#_instantiating_a_template">Instantiating a Template</a></li>
-<li><a href="#_managing_templates">Managing Templates</a></li>
-</ul>
-</li>
-<li><a href="#_data_provenance">Data Provenance</a>
-<ul class="sectlevel2">
-<li><a href="#_searching_for_events">Searching for Events</a></li>
-<li><a href="#_details_of_an_event">Details of an Event</a></li>
-<li><a href="#_viewing_flowfile_content">Viewing FlowFile Content</a></li>
-<li><a href="#_replaying_a_flowfile">Replaying a FlowFile</a></li>
-<li><a href="#_viewing_flowfile_lineage">Viewing FlowFile Lineage</a></li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-<div id="content">
-<div class="sect1">
-<h2 id="terminology">Terminology</h2>
-<div class="sectionbody">
-<div class="paragraph">
-<p><strong>DataFlow Manager</strong>: A DataFlow Manager (DFM) is a NiFi user who has permissions to add, remove, and modify components of a NiFi dataflow.</p>
-</div>
-<div class="paragraph">
-<p><strong>FlowFile</strong>: The FlowFile represents a single piece of data in NiFi. A FlowFile is made up of two components:
- FlowFile Attributes and FlowFile Content.
- Content is the data that is represented by the FlowFile. Attributes are key-value pairs that provide information or
- context about the data.
- All FlowFiles have the following Standard Attributes:</p>
-</div>
-<div class="ulist">
-<ul>
-<li>
-<p><strong>uuid</strong>: A unique identifier for the FlowFile</p>
-</li>
-<li>
-<p><strong>filename</strong>: A human-readable filename that may be used when storing the data to disk or in an external service</p>
-</li>
-<li>
-<p><strong>path</strong>: A hierarchically structured value that can be used when storing data to disk or an external service so that the data is not stored in a single directory</p>
-</li>
-</ul>
-</div>
-<div class="paragraph">
-<p><strong>Processor</strong>: The Processor is the NiFi component that is used to listen for incoming data; pull data from external sources;
- publish data to external sources; and route, transform, or extract information from FlowFiles.</p>
-</div>
-<div class="paragraph">
-<p><strong>Relationship</strong>: Each Processor has zero or more Relationships defined for it. These Relationships are named to indicate the result of processing a FlowFile.
- After a Processor has finished processing a FlowFile, it will route (or âtransferâ) the FlowFile to one of the Relationships.
- A DataFlow Manager is then able to connect each of these Relationships to other components in order to specify where the FlowFile should
- go next under each potential processing result.</p>
-</div>
-<div class="paragraph">
-<p><strong>Connection</strong>: A DataFlow Manager creates an automated dataflow by dragging components from the Components part of the NiFi toolbar to the canvas
- and then connecting the components together via Connections. Each connection consists of one or more Relationships.
- For each Connection that is drawn, a DataFlow Manager can determine which Relationships should be used for the Connection.
- This allows data to be routed in different ways based on its processing outcome. Each connection houses a FlowFile Queue.
- When a FlowFile is transferred to a particular Relationship, it is added to the queue belonging to the associated Connection.</p>
-</div>
-<div class="paragraph">
-<p><strong>Funnel</strong>: A funnel is a NiFi component that is used to combine the data from several Connections into a single Connection.</p>
-</div>
-<div class="paragraph">
-<p><strong>Process Group</strong>: When a dataflow becomes complex, it often is beneficial to reason about the dataflow at a higher, more abstract level.
- NiFi allows multiple components, such as Processors, to be grouped together into a Process Group.
- The NiFi User Interface then makes it easy for a DataFlow Manager to connect together multiple Process Groups into a logical dataflow,
- as well as allowing the DataFlow Manager to enter a Process Group in order to see and manipulate the components within the Process Group.</p>
-</div>
-<div class="paragraph">
-<p><strong>Port</strong>: Dataflows that are constructed using one or more Process Groups need a way to connect a Process Group to other dataflow components.
- This is achieved by using Ports. A DataFlow Manager can add any number of Input Ports and Output Ports to a Process Group and name these ports appropriately.</p>
-</div>
-<div class="paragraph">
-<p><strong>Remote Process Group</strong>: Just as data is transferred into and out of a Process Group, it is sometimes necessary to transfer data from one instance of NiFi to another.
- While NiFi provides many different mechanisms for transferring data from one system to another, Remote Process Groups are often the easiest way to accomplish
- this if transferring data to another instance of NiFi.</p>
-</div>
-<div class="paragraph">
-<p><strong>Bulletin</strong>: The NiFi User Interface provides a significant amount of monitoring and feedback about the current status of the application.
- In addition to rolling statistics and the current status that are provided for each component, components are able to report Bulletins.
- Whenever a component reports a Bulletin, an icon is displayed on that component (or on the Status bar near the top of the page, for System-Level Bulletins).
- Using the mouse to hover over that icon will provide a tool-tip that shows the time and severity (Debug, Info, Warning, Error) of the bulletin,
- as well as the message of the Bulletin.
- Bulletins from all components can also be viewed and filtered in the Bulletins Page, available in the Management Toolbar.</p>
-</div>
-<div class="paragraph">
-<p><strong>Template</strong>: Often times, a dataflow is comprised of many sub-flows that could be reused. NiFi allows DataFlow Managers to select a part of the dataflow
- (or the entire dataflow) and create a Template. This Template is given a name can then be dragged onto the canvas just like the other components.
- As a result, several components be combined together to make a larger building block from which to create a dataflow.
- These templates can also be exported as XML and imported into another NiFi instance, allowing these building blocks to be shared.</p>
-</div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_nifi_user_interface">NiFi User Interface</h2>
-<div class="sectionbody">
-<div class="paragraph">
-<p>The NiFi User Interface (UI) provides mechanisms for creating automated dataflows, as well as visualizing,
-editing, monitoring, and administering those dataflows. The UI can be broken down into several different segments,
-each responsible for different functionality of the application. We will begin by looking at screenshots of the
-application and labeling the different segments of the UI. We will provide a brief explanation of the purpose of each segment.
-Then, in the following sections of this document, we will discuss each of those segments in greater detail.</p>
-</div>
-<div class="paragraph">
-<p>When the application is started, by default, the user is able to navigate to the User Interface by going to
-<code>http://<hostname>:8080/nifi</code> in a web browser. There are no permissions configured, by default, so anyone is
-able to view and modify the dataflow. For information on securing the system, see Systems Administrator guide.</p>
-</div>
-<div class="paragraph">
-<p>When a DataFlow Manager navigates to the UI for the first time, a blank canvas is provided on which a dataflow can be built:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/new-flow.png" alt="Empty Flow">
-</div>
-</div>
-<div class="paragraph">
-<p>Along the top of the of the screen is a toolbar that contains several of these segments.
-To the left is the Components Toolbar. This toolbar consists of the different components that can be dragged onto the canvas.</p>
-</div>
-<div class="paragraph">
-<p>Next to the Components Toolbar is the Actions Toolbar. This toolbar consists of buttons to manipulate the existing
-components on the graph. Following the Actions Toolbar is the Search Toolbar. This toolbar consists of a single
-Search field that allows users to easily find components on the graph. Users are able to search by component name,
-type, identifier, and configuration properties.</p>
-</div>
-<div class="paragraph">
-<p>Finally, the Management Toolbar sits to the right-hand side of the screen. This toolbar consists of buttons that are
-of use to DataFlow Managers to manage the flow as well as administrators who may use this section to manage user access
-and configure system properties, such as how many system resources should be provided to the application.</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/nifi-toolbar-components.png" alt="NiFi Components Toolbar">
-</div>
-</div>
-<div class="paragraph">
-<p>Next, we have segments that provide capabilities to easily navigate around the graph. On the left-hand side is a toolbar that
-provides the ability to pan around the graph and zoom in and out. On the right-hand side is a âBirds-Eye Viewâ of the dataflow.
-This provides a high-level view of the dataflow and allows the user to quickly and easily pan across large portions of the dataflow.
-Along the top of the screen is a trail of breadcrumbs. As users navigate into and out of Process Groups, the breadcrumbs show
-the depth in the flow and each Process Group that was entered to reach this depth. Each of the Process Groups listed in the breadcrumbs
-is a link that will take you back up to that level in the flow.</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/nifi-navigation.png" alt="NiFi Navigation">
-</div>
-</div>
-<div class="paragraph">
-<p>Below the breadcrumbs lives the Status bar. The Status bar provides information about how many Processors exist in the graph in
-each state (Stopped, Running, Invalid, Disabled), how many Remote Process Groups exist on the graph in each state
-(Transmitting, Not Transmitting), the number of threads that are currently active in the flow, the amount of data that currently
-exists in the flow, and the timestamp at which all of this information was last refreshed. If there are any System-Level bulletins,
-these are shown in the Status bar as well. Additionally, if the instance of NiFi is clustered, the Status bar shows many nodes
-are in the cluster and how many are currently connected.</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/status-bar.png" alt="NiFi Status Bar">
-</div>
-</div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_building_a_dataflow">Building a DataFlow</h2>
-<div class="sectionbody">
-<div class="paragraph">
-<p>A DataFlow Manager (DFM) is able to build an automated dataflow using the NiFi User Interface (UI). This is accomplished
-by dragging components from the toolbar to the canvas, configuring the components to meet specific needs, and connecting
-the components together.</p>
-</div>
-<div class="sect2">
-<h3 id="_adding_components_to_the_canvas">Adding Components to the Canvas</h3>
-<div class="paragraph">
-<p>In the User Interface section above, we outlined the different segments of the UI and pointed out a Components Toolbar.
-Here, we will look at each of the Components in that toolbar:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/components.png" alt="Components">
-</div>
-</div>
-<div class="paragraph">
-<p><span class="image"><img src="images/iconProcessor.png" alt="Processor" width="32"></span>
-<strong>Processor</strong>: The Processor is the most commonly used component, as it is responsible for data ingress, egress, routing, and
- manipulating. There are many different types of Processors. In fact, this is a very common Extension Point in NiFi,
- meaning that many vendors may implement their own Processors to perform whatever functions are necessary for their use case.
- When a Processor is dragged onto the graph, the user is presented with a dialog to choose which type of Processor to use:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/add-processor.png" alt="Add Processor Dialog">
-</div>
-</div>
-<div class="paragraph">
-<p>In the top-right corner, the user is able to filter the list based on the Processor Type or the Tags associated with a Processor.
-Processor developers have the ability to add Tags to their Processors. These tags are used in this dialog for filtering and are
-displayed on the left-hand side in a Tag Cloud. The more Processors that exist with a particular Tag, the larger the Tag appears
-in the Tag Cloud. Clicking a Tag in the Cloud will filter the available Processors to only those that contain that Tag. If multiple
-Tags are selected, only those Processors that contain all of those Tags are shown. For example, if we want to show only those
-Processors that allow us to ingest data via HTTP, we can select both the <code>http</code> Tag and the <code>ingest</code> Tag:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/add-processor-with-tag-cloud.png" alt="Add Processor with Tag Cloud">
-</div>
-</div>
-<div class="paragraph">
-<p>Clicking the <code>Add</code> button or double-clicking on a Processor Type will add the selected Processor to the canvas at the
-location that it was dropped.</p>
-</div>
-<div class="paragraph">
-<p><span class="image"><img src="images/iconInputPort.png" alt="Input Port" width="32"></span>
-<strong>Input Port</strong>: Input Ports provide a mechanism for transferring data into a Process Group. When an Input Port is dragged
-onto the canvas, the DFM is prompted to name the Port. All Ports within a Process Group must have unique names.</p>
-</div>
-<div class="paragraph">
-<p>All components exist only within a Process Group. When a user navigates to the NiFi page, the user is placed in the
-Root Progress Group. If the Input Port is dragged onto the Root Progress Group, the Input Port provides a mechanism
-to receive data from remote instances of NiFi. In this case, the Input Port can be configured to restrict access to
-appropriate users.</p>
-</div>
-<div class="paragraph">
-<p><span class="image"><img src="images/iconOutputPort.png" alt="Output Port" width="32"></span>
-<strong>Output Port</strong>: Output Ports provide a mechanism for transferring data from a Process Group back to destination outside
-of the Process Group. When an Output Port is dragged onto the canvas, the DFM is prompted to name the Port. All Ports
-within a Process Group must have unique names.</p>
-</div>
-<div class="paragraph">
-<p>If the Output Port is dragged onto the Root Process Group, the Output Port provides a mechanism for sending data to
-remote instances of NiFi. In this case, the Port acts as a queue. As remote instances of NiFi pull data from the port,
-that data is removed from the queues of the incoming Connections.</p>
-</div>
-<div class="paragraph">
-<p><span class="image"><img src="images/iconProcessGroup.png" alt="Process Group" width="32"></span>
-<strong>Process Group</strong>: Process Groups can be used logically group a set of components so that the dataflow is easier to understand
-and maintain. When a Process Group is dragged onto the canvas, the DFM is prompted to name the Process Group. All Process
-Groups within the same parent group must have unique names.</p>
-</div>
-<div class="paragraph">
-<p><span class="image"><img src="images/iconRemoteProcessGroup.png" alt="Remote Process Group" width="32"></span>
-<strong>Remote Process Group</strong>: Remote Process Groups appear and behave similar to Process Groups. However, the Remote Process Group (RPG)
-references a remote instance of NiFi. When an RPG is dragged onto the canvas, rather than being prompted for a name, the DFM
-is prompted for the URL of the remote NiFi instance. If the remote NiFi is a clustered instance, the URL that should be used
-is the URL of the remote instance’s NiFi Cluster Manager (NCM). When data is transferred to a clustered instance of NiFi
-via an RPG, the RPG it will first connect to the remote instance’s NCM to determine which nodes are in the cluster and
-how busy each node is. This information is then used to load balance the data that is pushed to each node. The remote NCM is
-then interrogated periodically to ensure that any nodes that are dropped from the cluster and no longer sent to, any new nodes
-will be added to the list of nodes, and to recalculate the load balancing based on each node’s load.</p>
-</div>
-<div class="paragraph">
-<p><span class="image"><img src="images/iconFunnel.png" alt="Funnel" width="32"></span>
-<strong>Funnel</strong>: Funnels are used to combine the data from many Connections into a single Connection. This has two advantages.
-First, if many Connections are created with the same destination, the canvas can become cluttered if those Connections
-have to span a large space. By funneling these Connections into a single Connection, that single Connection can then be
-drawn to span that large space instead. Secondly, Connections can be configured with FlowFile Prioritizers. Data from
-several Connections can be funneled into a single Connection, providing the ability to Prioritize all of the data on that
-one Connection, rather than prioritizing the data on each Connection independently.</p>
-</div>
-<div class="paragraph">
-<p><span class="image"><img src="images/iconTemplate.png" alt="Template" width="32"></span>
-<strong>Template</strong>: Templates can be created by DataFlow Managers from sections of the flow, or they can be imported from other
-dataflows. These Templates provide larger building blocks for creating a complex flow quickly. When the Template is
-dragged onto the canvas, the DFM is provided a dialog to choose which Template to add to the canvas:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/instantiate-template.png" alt="Instantiate Template Dialog">
-</div>
-</div>
-<div class="paragraph">
-<p>Clicking the drop-down box shows all available Templates. Any Template that was created with a description will show an
-icon indicating that there is more information. Hovering over the icon with the mouse will show this description:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/instantiate-template-description.png" alt="Instantiate Template Dialog">
-</div>
-</div>
-<div class="paragraph">
-<p><span class="image"><img src="images/iconLabel.png" alt="Label"></span>
-<strong>Label</strong>: Labels are used to provide documentation to parts of a dataflow. When a Label is dropped onto the canvas,
-it is created with a default size. The Label can then be resized by dragging the handle in the bottom-right corner.
-The Label has no text when initially created. The text of the Label can be added by right-clicking on the Label and
-choosing <code>Configure...</code></p>
-</div>
-</div>
-<div class="sect2">
-<h3 id="_configuring_a_processor">Configuring a Processor</h3>
-<div class="paragraph">
-<p>Once a Processor has been dragged onto the Canvas, it is ready to configure. This is done by right-clicking on the
-Processor and clicking the <code>Configure...</code> option from the context menu. The configuration dialog is opened with four
-different tabs, each of which is discussed below. Once you have finished configuring the Processor, you can apply
-the changes by clicking the <code>Apply</code> button or cancel all changes by clicking the <code>Cancel</code> button.</p>
-</div>
-<div class="paragraph">
-<p>Note that after a Processor has been started, the context menu shown for the Processor no longer has a <code>Configure...</code>
-option but rather has a <code>View Configuration</code> option. Processor configuration cannot be changed while the Processor is
-running. You must first stop the Processor and wait for all of its active tasks to complete before configuring
-the Processor again.</p>
-</div>
-<div class="sect3">
-<h4 id="_settings_tab">Settings Tab</h4>
-<div class="paragraph">
-<p>The first tab in the Processor Configuration dialog is the Settings tab:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/settings-tab.png" alt="Settings Tab">
-</div>
-</div>
-<div class="paragraph">
-<p>This tab contains several different configuration items. First, it allows the DFM to change the name of the Processor.
-The name of a Processor by default is the same as the Processor type. Next to the Processor Name is a control for
-determining whether or not the Processor is Enabled. When a Processor is added to the graph, it is enabled. If the
-Processor is disabled, it cannot be started. This is used to indicate that even when a group of Processors are started,
-such as when a DFM starts an entire Process Group, this Processor should be excluded.</p>
-</div>
-<div class="paragraph">
-<p>Below the Name configuration, the Processor’s unique identifier is displayed along with the Processor’s type. These
-values cannot be modified.</p>
-</div>
-<div class="paragraph">
-<p>Next are two dialogues for configuring ‘Penalty duration’ and ‘Yield duration’. During the normal course of processing a
-piece of data (a FlowFile), an event may occur that indicates that the data cannot be processed at this time but the
-data may be processable at a later time. When this occurs, the Processor may choose to Penalize the FlowFile. This will
-prevent the FlowFile from being Processed for some period of time. For example, if the Processor is to push the data
-to a remote service, but the remote service already has a file with the same name as the filename that the Processor
-is specifying, the Processor may penalize the FlowFile. The ‘Penalty duration’ allows the DFM to specify what
-how long the FlowFile should be penalized. The default value is 30 seconds.</p>
-</div>
-<div class="paragraph">
-<p>Similarly, the Processor may determine that some situation exists such that the Processor can no longer make any progress,
-regardless of the data that it is processing. For example, if a Processor is to push data to a remote service and that
-service is not responding, the Processor cannot make any progress. As a result, the Processor should ‘yield,’ which will
-prevent the Processor from being scheduled to run for some period of time. That period of time is specified by setting
-the ‘Yield duration.’ The default value is 1 second.</p>
-</div>
-<div class="paragraph">
-<p>The last configurable option on the left-hand side of the Settings tab is the Bulletin level. Whenever the Processor writes
-to its log, the Processor also will generate a Bulletin. This setting indicates the lowest level of Bulletin that should be
-shown in the User Interface. By default, the Bulletin level is set to WARN.</p>
-</div>
-<div class="paragraph">
-<p>The right-hand side of the dialogue provides an ‘Auto-terminate relationships’ section. Each of the Relationships that is
-defined by the Processor is listed here, along with its description. In order for a Processor to be considered valid and
-able to run, each Relationship defined by the Processor must be either connected to a downstream component or auto-terminated.
-If a Relationship is auto-terminated, any FlowFile that is routed to that Relationship will be removed from the flow and
-its processing considered complete. Any Relationship that is already connected to a downstream component cannot be auto-terminated.
-The Relationship must first be removed from any Connection that uses it. Additionally, for any Relationship that is selected to be
-auto-terminated, the auto-termination status will be cleared if the Relationship is added to a Connection.</p>
-</div>
-</div>
-<div class="sect3">
-<h4 id="_scheduling_tab">Scheduling Tab</h4>
-<div class="paragraph">
-<p>The second tab in the Processor Configuration dialog is the Scheduling Tab:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/scheduling-tab.png" alt="Scheduling Tab">
-</div>
-</div>
-<div class="paragraph">
-<p>The first configuration option is the Scheduling Strategy. There are three options for scheduling components:</p>
-</div>
-<div class="ulist">
-<ul>
-<li>
-<p><strong>Timer driven</strong>: This is the default mode. The Processor will be scheduled to run on a regular interval. The interval
-at which the Processor is run is defined by the ‘Run schedule’ option (see below).</p>
-</li>
-<li>
-<p><strong>Event driven</strong>: When this mode is selected, the Processor will be triggered to run by FlowFiles entering the Connections
-that have this Processor as their destination. This mode is not supported by all Processors. When this mode is
-selected, the ‘Run schedule’ option is not configurable, as the Processor is not triggered to run periodically but
-rather is triggered to run as the result of an event. Additionally, this is the only mode for which the ‘Concurrent tasks’
-option can be set to 0. In this case, the number of threads is limited only by the size of the Event-Driven Thread Pool that
-the administrator has configured.</p>
-</li>
-<li>
-<p><strong>CRON driven</strong>: When using the CRON driven scheduling mode, the Processor is scheduled to run periodically, similarly to the
-Timer driven scheduling mode. However, the CRON driven mode provides significantly more flexibility at the expensive of
-increasing the complexity of the configuration. This value is made up of 6 fields, each separated by a space. These
-fields represent the following fields:</p>
-<div class="olist arabic">
-<ol class="arabic">
-<li>
-<p>Seconds</p>
-</li>
-<li>
-<p>Minutes</p>
-</li>
-<li>
-<p>Hours</p>
-</li>
-<li>
-<p>Day of Month</p>
-</li>
-<li>
-<p>Month</p>
-</li>
-<li>
-<p>Day of Week</p>
-</li>
-<li>
-<p>Year</p>
-</li>
-</ol>
-</div>
-<div class="paragraph">
-<p>The value for each of these fields should be a number, range, or increment.
-Range here refers to a syntax of <number>-<number>.
-For example,the Seconds field could be set to 0-30, meaning that the Processor should only be scheduled if the time is 0 to 30 seconds
-after the minute. Additionally, a value of <code>*</code> indicates that all values are valid for this field. Multiple values can also
-be entered using a <code>,</code> as a separator: <code>0,5,10,15,30</code>.
-An increment is written as <start value>/<increment>. For example, settings a value of <code>0/10</code> for the seconds fields means that valid
-values are 0, 10, 20, 30, 40, and 50. However, if we change this to <code>5/10</code>, valid values become 5, 15, 25, 35, 45, and 55.</p>
-</div>
-<div class="paragraph">
-<p>For the Month field, valid values are 1 (January) through 12 (December).</p>
-</div>
-<div class="paragraph">
-<p>For the Day of Week field, valid values are 1 (Sunday) through 7 (Saturday). Additionally, a value of <code>L</code> may be appended to one of these
-values to indicate the last occurrence of this day in the month. For example, <code>1L</code> can be used to indicate the last Monday of the month.</p>
-</div>
-</li>
-</ul>
-</div>
-<div class="paragraph">
-<p>Next, the Scheduling Tab provides a configuration option named ‘Concurrent tasks.’ This controls how many threads the Processor
-will use. Said a different way, this controls how many FlowFiles should be processed by this Processor at the same time. Increasing
-this value will typically allow the Processor to handle more data in the same amount of time. However, it does this by using system
-resources that then are not usable by other Processors. This essentially provides a relative weighting of Processors — it controls
-how much of the system’s resources should be allocated to this Processor instead of other Processors. This field is available for
-most Processors. There are, however, some types of Processors that can only be scheduled with a single Concurrent task.</p>
-</div>
-<div class="paragraph">
-<p>The “Run schedule” dictates how often this Processor should be scheduled to run. The valid values for this field depend on the selected
-Scheduling Strategy (see above). If using the Event driven Scheduling Strategy, this field is not available. When using the Timer driven
-Scheduling Strategy, this value is a time duration specified by a number followed by a time unit. For example, <code>1 second</code> or <code>5 mins</code>.
-The default value of <code>0 sec</code> means that the Processor should run as often as possible as long as it has data to process. This is true
-for any time duration of 0, regardless of the time unit (i.e., <code>0 sec</code>, <code>0 mins</code>, <code>0 days</code>). For an explanation of values that are
-applicable for the CRON driven Scheduling Strategy, see the description of the CRON driven Scheduling Strategy itself.</p>
-</div>
-<div class="paragraph">
-<p>The right-hand side of the tab contains a slider for choosing the ‘Run duration.’ This controls how long the Processor should be scheduled
-to run each time that it is triggered. On the left-hand side of the slider, it is marked ‘Lower latency’ while the right-hand side
-is marked ‘Higher throughput.’ When a Processor finishes running, it must update the repository in order to transfer the FlowFiles to
-the next Connection. Updating this repository is expensive, so the more work that can be done at once before updating the repository
-the more work the Processor can handle (Higher throughput). However, this means that the next Processor cannot start processing
-those FlowFiles until the previous Process updates this repository. As a result, the latency will be longer (the time required to process
-the FlowFile from beginning to end will be longer). As a result, the slider provides a spectrum from which the DFM can choose to favor
-Lower Latency or Higher Throughput.</p>
-</div>
-</div>
-<div class="sect3">
-<h4 id="_properties_tab">Properties Tab</h4>
-<div class="paragraph">
-<p>The Properties Tab provides a mechanism to configure Processor-specific behavior. There are no default properties. Each type of Processor
-must define which Properties make sense for its use case. Below, we see the Properties Tab for a RouteOnAttribute Processor:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/properties-tab.png" alt="Properties Tab">
-</div>
-</div>
-<div class="paragraph">
-<p>This Processor, by default, has only a single property: ‘Routing Strategy.’ The default value is ‘Route on Property name.’ Next to
-the name of this property is a small question-mark symbol (
-<span class="image"><img src="images/iconInfo.png" alt="Question Mark"></span>
-). This help symbol is seen in other places throughout the application, as well, and indicates that more information is available.
-Hovering over this symbol with the mouse will provide additional details about the property and the default value, as well as
-historical values that have been set for the Property.</p>
-</div>
-<div class="paragraph">
-<p>Clicking on the value for the property will allow a DFM to change the value. Depending on the values that are allowed for the property,
-the user is either provided a drop-down from which to choose a value or is given a text area to type a value:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/edit-property-dropdown.png" alt="Edit Property with Dropdown">
-</div>
-</div>
-<div class="paragraph">
-<p>In the top-right corner of the tab is a button for adding a New Property. Clicking this button will provide the DFM with a dialog to
-enter the name and value of a new property. Not all Processors allow User-Defined properties. In this case, the Processor would become
-invalid when the properties are applied. RouteOnAttribute, for example, does allow User-Defined properties. In fact, this Processor
-will not be valid until the user has added a property.</p>
-</div>
-<div class="paragraph">
-<p><span class="image"><img src="images/edit-property-textarea.png" alt="Edit Property with Text Area"></span></p>
-</div>
-<div class="paragraph">
-<p>Not that after a User-Defined property has been added, an icon will appear on the right-hand side of that row (
-<span class="image"><img src="images/iconDelete.png" alt="Delete Icon"></span>
-). Clicking this button will remove the User-Defined property from the Processor.</p>
-</div>
-</div>
-<div class="sect3">
-<h4 id="_comments_tab">Comments Tab</h4>
-<div class="paragraph">
-<p>The last tab in the Processor configuration dialog is the Comments tab. This tab simply provides an area for users to provide
-whatever comments are appropriate for this component:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/comments-tab.png" alt="Comments Tab">
-</div>
-</div>
-</div>
-</div>
-<div class="sect2">
-<h3 id="_additional_help">Additional Help</h3>
-<div class="paragraph">
-<p>Each Processor has the ability to provide additional documentation about its usage. This documentation can be found by right-clicking
-on the Processor and then selecting the ‘Usage’ item from the context menu. Alternatively, clicking the ‘Help’ link in the top-right
-corner of the application will provide a Help page with all of the Processors that are available. Clicking on the Processor in the list
-will then show its usage.</p>
-</div>
-</div>
-<div class="sect2">
-<h3 id="_connecting_components">Connecting Components</h3>
-<div class="paragraph">
-<p>After the appropriate Processors have been added to the graph and configured to meet your needs, they will have to be connected
-to one another so that NiFi knows what to do with each FlowFile after it has been processed. This is accomplished by creating a
-Connection between two components. When the mouse hovers over a component, a new Connection icon (
-<span class="image"><img src="images/addConnect.png" alt="Connection Bubble"></span>
-) will appear in the middle of the component:</p>
-</div>
-<div class="paragraph">
-<p><span class="image"><img src="images/processor-connection-bubble.png" alt="Processor with Connection Bubble"></span></p>
-</div>
-<div class="paragraph">
-<p>This Connection bubble can then be dragged from this component to another component, which will provide to the user a
-‘Create Connection’ dialog. This dialog consists of two tabs: ‘Details’ and ‘Settings’.</p>
-</div>
-<div class="sect3">
-<h4 id="_details_tab">Details Tab</h4>
-<div class="paragraph">
-<p>The Details Tab provides information about the source and destination components, including the component name, the
-component type, and the Process Group in which the component lives:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/create-connection.png" alt="Create Connection">
-</div>
-</div>
-<div class="paragraph">
-<p>Additionally, this tab provides the ability to choose which Relationships should be included in this Connection. At least one
-Relationship must be selected. If only one Relationship is available, it is automatically selected.</p>
-</div>
-<div class="paragraph">
-<p><strong>Note</strong>: If multiple Connections are added with the same Relationship, any FlowFile that is routed to that Relationship will
-automatically be ‘cloned’, and a copy will be sent to each of those Connections.</p>
-</div>
-</div>
-<div class="sect3">
-<h4 id="_settings">Settings</h4>
-<div class="paragraph">
-<p>The Settings Tab provides the ability to configure the Connection’s name, FlowFile expiration, back pressure thresholds, and
-Prioritization:</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>The Connection name is optional. If not specified, the name shown for the Connection will be names of the Relationships
-that are active for the Connection.</p>
-</div>
-<div class="paragraph">
-<p>File expiration is a concept by which data that cannot be processed in a timely fashion can be automatically destroyed.
-This is useful, for example, when the volume of data is expected to exceed the volume that can be sent to a remote site.
-In this case, the expiration can be used in conjunction with Prioritizers to ensure that the highest priority data is
-processed first and then anything that cannot be processed within one hour, for example, can be dropped. The default
-value of <code>0 sec</code> indicates that the data will never expire.</p>
-</div>
-<div class="paragraph">
-<p>NiFi provides two different configuration elements for back pressure. These thresholds indicate how much data should be
-allowed to exist in the queue before the component that is the source of the Connection is no longer scheduled to run.
-This allows the system to avoid being overrun with data. The first option provided is the “Back pressure object threshold.”
-This is the number of FlowFiles that can be in the queue before back pressure is applied. The second configuration option
-is the “Back pressure data size threshold.”
-This specifies the maximum amount of data that should be queued up before
-applying back pressure. This value is configured by entering a number followed by a data size (<code>B</code> for bytes, <code>KB</code> for
-kilobytes, <code>MB</code> for megabytes, <code>GB</code> for gigabytes, or <code>TB</code> for terabytes).</p>
-</div>
-<div class="paragraph">
-<p>The right-hand side of the tab provides the ability to prioritize the data in queue so that higher priority data is
-processed first. Prioritizers can be dragged from the top (‘Available prioritizers’) to the bottom (‘Selected prioritizers’).
-Multiple prioritizers can be selected. The prioritizer that is at the top of the ‘Selected prioritizers’ list is the highest
-priority. If two FlowFiles have the same value according to this prioritizer, the second prioritizer will determine which
-FlowFile to process first, and so on. If a prioritizer is no longer desired, it can then be dragged from the ‘Selected
-prioritizers’ list to the ‘Available prioritizers’ list.</p>
-</div>
-</div>
-</div>
-<div class="sect2">
-<h3 id="_processor_validation">Processor Validation</h3>
-<div class="paragraph">
-<p>Before trying to start a Processor, it’s important to make sure that the Processor’s configuration is valid.
-A status indicator is shown in the top-left of the Processor. If the Processor is invalid, the indicator
-will show a yellow Warning indicator with an exclamation mark indicating that there is a problem:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/invalid-processor.png" alt="Invalid Processor">
-</div>
-</div>
-<div class="paragraph">
-<p>In this case, hovering over the indicator icon with the mouse will provide a tooltip showing all of the validation
-failures for the Processor. Once all of the validation errors have been addressed, the status indicator will change
-to a Stop icon, indicating that the Processor is valid and ready to be start but currently is not running:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/valid-processor.png" alt="Valid Processor">
-</div>
-</div>
-</div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_command_and_control_of_dataflow">Command and Control of DataFlow</h2>
-<div class="sectionbody">
-<div class="paragraph">
-<p>When a component is added to the NiFi canvas, it is in the Stopped state. In order to cause the component to
-be triggered, the component must be started. Once started, the component can be stopped at any time. From a
-Stopped state, the component can then be configured, started, or disabled.</p>
-</div>
-<div class="sect2">
-<h3 id="_starting_a_component">Starting a Component</h3>
-<div class="paragraph">
-<p>In order to start a component, the following conditions must be met:
-- The component’s configuration must be valid.
-- All defined Relationships for component must be connected to another component or auto-terminated.
-- The component must be stopped.
-- The component must be enabled.
-- The component must have no active tasks. For more information about active tasks, see the “Anatomy of …​”
-sections under <a href="#monitoring">Monitoring of DataFlow</a> (<a href="#processor_anatomy">Anatomy of a Processor</a>, <a href="#process_group_anatomy">Anatomy of a Process Group</a>, <a href="#remote_group_anatomy">Anatomy of a Remote Process Group</a>).</p>
-</div>
-<div class="paragraph">
-<p>Components can be started by selecting all of the components to start and then clicking the Start icon (
-<span class="image"><img src="images/iconRun.png" alt="Start"></span>
-) in the
-Actions Toolbar or by right-clicking a single component and choosing Start from the context menu.</p>
-</div>
-<div class="paragraph">
-<p>If starting a Process Group, all components within that Process Group (including child Process Groups) will
-be started, with the exception of those components that are invalid or disabled.</p>
-</div>
-<div class="paragraph">
-<p>Once started, the status indicator of a Processor will change to a Play symbol (
-<span class="image"><img src="images/iconRun.png" alt="Run"></span>
-).</p>
-</div>
-</div>
-<div class="sect2">
-<h3 id="_stopping_a_component">Stopping a Component</h3>
-<div class="paragraph">
-<p>A component can be stopped any time that it is running. A component is stopped by right-clicking on the component
-and clicking Stop from the context menu, or by clicking the Stop icon (
-<span class="image"><img src="images/iconStop.png" alt="Stop"></span>
-) in the Actions Toolbar.</p>
-</div>
-<div class="paragraph">
-<p>If a Process Group is stopped, all of the components within the Process Group (including child Process Groups)
-will be stopped.</p>
-</div>
-<div class="paragraph">
-<p>Once stopped, the status indicator of a Processor will change to the Stop symbol (
-<span class="image"><img src="images/iconStop.png" alt="Stop"></span>
-).</p>
-</div>
-<div class="paragraph">
-<p>Stopping a component does not interrupt its currently running tasks. Rather, it stops scheduling new tasks to
-be performed. The number of active tasks is shown in the top-right corner of the Processor (see <a href="#processor_anatomy">Anatomy of a Processor</a>
-for more information).</p>
-</div>
-</div>
-<div class="sect2">
-<h3 id="_enabling_disabling_a_component">Enabling/Disabling a Component</h3>
-<div class="paragraph">
-<p>When a component is enabled, it is able to be started. Components may be disabled when part of a
-dataflow is still being assembled, for example, and as a result should not be started. Typically,
-if a component is not intended to be run, the component is disabled, rather than being left in the
-Stopped state. This helps to distinguish between components that are intentionally not running and
-those components that may have been stopped temporarily (for instance, to change the component’s
-configuration) and inadvertently were never restarted.</p>
-</div>
-<div class="paragraph">
-<p>When it is desirable to re-enable a component, it can be enabled by selecting the component and
-clicking the Enable icon (
-<span class="image"><img src="images/iconEnable.png" alt="Enable"></span>
-) in the Actions Toolbar. This is available only when the selected component or components are disabled.
-Alternatively, a component can be enabled by checking the checkbox next to the “Enabled” option in
-the Settings tab of the Processor configuration dialog or the configuration dialog for a Port.</p>
-</div>
-<div class="paragraph">
-<p>Once enabled, the component’s status indicator will change to either Invalid (
-<span class="image"><img src="images/iconAlert.png" alt="Invalid"></span>
-) or Stopped (
-<span class="image"><img src="images/iconStop.png" alt="Stopped"></span>
-), depending on whether or not the component is valid.</p>
-</div>
-<div class="paragraph">
-<p>A component is then disabled by selecting the component and clicking the Disable icon (
-<span class="image"><img src="images/iconDisable.png" alt="Disable"></span>
-) in the Actions Toolbar, or by clearing the checkbox next to the “Enabled” option in the Settings tab
-of the Processor configuration dialog or the configuration dialog for a Port.</p>
-</div>
-<div class="paragraph">
-<p>Only Ports and Processors can be enabled and disabled.</p>
-</div>
-</div>
-<div class="sect2">
-<h3 id="_remote_process_group_transmission">Remote Process Group Transmission</h3>
-<div class="paragraph">
-<p>Remote Process Groups provide a mechanism for sending data to or retrieving data from a remote instance
-of NiFi. When a Remote Process Group (RPG) is added to the canvas, it is added with the Transmision Disabled,
-as indicated by the icon (
-<span class="image"><img src="images/iconTransmissionInactive.png" alt="Transmission Disabled"></span>
-) in the top-left corner. When Transmission is Disabled, it can be enabled by right-clicking on the
-RPG and clicking the “Enable Transmission” menu item. This will cause all ports for which there is a Connection
-to begin transmitting data. This will cause the status indicator to then change to the Transmission Enabled icon (
-<span class="image"><img src="images/iconTransmissionActive.png" alt="Transmission Enabled"></span>
-).</p>
-</div>
-<div class="paragraph">
-<p>If there are problems communicating with the Remote Process Group, a Warning indicator (
-<span class="image"><img src="images/iconAlert.png" alt="Warning"></span>
-) may instead be present in the top-left corner. Hovering over this Warning indicator with the mouse will provide
-more information about the problem.</p>
-</div>
-<div class="sect3">
-<h4 id="_individual_port_transmission">Individual Port Transmission</h4>
-<div class="paragraph">
-<p>There are times when the DFM may want to either enable or disable transmission for only a specific
-Port within the Remote Process Group. This can be accomplished by right-clicking on the Remote Process Group
-and choosing the “Remote ports” menu item. This provides a configuration dialog from which each Port can be
-configured:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/remote-group-ports-dialog.png" alt="Remote Process Groups">
-</div>
-</div>
-<div class="paragraph">
-<p>The left-hand side lists all of the Input Ports that the remote instance of NiFi allows data to be sent to.
-The right-hand side lists all of the Output Ports from which this instance is able to pull data.
-If the remote instance is using secure communications (the URL of the NiFi instance begins with <code>https://</code>,
-rather than <code>http://</code>), any Ports that the remote instance has not made available to this instance will not
-be shown.</p>
-</div>
-<div class="paragraph">
-<p><strong>Note</strong>: If a Port that is expected to be shown is not shown in this dialog, ensure that the instance has proper
-permissions and that the Remote Process Group’s flow is current. This can be checked by closing the Port
-Configuration Dialog and looking at the bottom-right corner of the Remote Process Group. The data at which
-the flow was last refresh is shown. If the flow appears to be outdated, it can be updated by right-clicking
-on the Remote Process Group and selecting “Refresh flow.” (See <a href="#remote_group_anatomy">Anatomy of a Remote Process Group</a> for more information).</p>
-</div>
-<div class="paragraph">
-<p>Each Port is shown with the Port name, followed by its description, currently configured number of Concurrent
-tasks, and whether or not data sent to this port will be compressed. To the left of this information is a switch
-to turn the Port on or off. Those Ports that have no Connections attached to them are grayed out:</p>
-</div>
-<div class="imageblock">
-<div class="content">
-<img src="images/remote-port-connection-status.png" alt="Remote Port Statuses">
-</div>
-</div>
-<div class="paragraph">
-<p>The on/off switch provides a mechanism to enable and disable transmission for each Port in the Remote
-Process Group independently. Those Ports that are connected but are not currently transmitting can be
-configured by clicking the pencil icon (
-<span class="image"><img src="images/iconEdit.png" alt="Edit"></span>
-) below the on/off switch. Clicking this icon will allow the DFM to change the number of Concurrent tasks and whether
-or not compression should be used when transmitting data to or from this Port.</p>
-</div>
-</div>
-</div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="monitoring">Monitoring of DataFlow</h2>
-<div class="sectionbody">
-<div class="sect2">
-<h3 id="processor_anatomy">Anatomy of a Processor</h3>
-
-</div>
-<div class="sect2">
-<h3 id="process_group_anatomy">Anatomy of a Process Group</h3>
-
-</div>
-<div class="sect2">
-<h3 id="remote_group_anatomy">Anatomy of a Remote Process Group</h3>
-
-</div>
-<div class="sect2">
-<h3 id="_status_page">Status Page</h3>
-
-</div>
-<div class="sect2">
-<h3 id="_historical_statics_of_a_component">Historical Statics of a Component</h3>
-
-</div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_templates">Templates</h2>
-<div class="sectionbody">
-<div class="sect2">
-<h3 id="_creating_a_template">Creating a Template</h3>
-
-</div>
-<div class="sect2">
-<h3 id="_instantiating_a_template">Instantiating a Template</h3>
-
-</div>
-<div class="sect2">
-<h3 id="_managing_templates">Managing Templates</h3>
-<div class="sect3">
-<h4 id="_importing_a_template">Importing a Template</h4>
-
-</div>
-<div class="sect3">
-<h4 id="_exporting_a_template">Exporting a Template</h4>
-
-</div>
-<div class="sect3">
-<h4 id="_removing_a_template">Removing a Template</h4>
-
-</div>
-</div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_data_provenance">Data Provenance</h2>
-<div class="sectionbody">
-<div class="sect2">
-<h3 id="_searching_for_events">Searching for Events</h3>
-
-</div>
-<div class="sect2">
-<h3 id="_details_of_an_event">Details of an Event</h3>
-
-</div>
-<div class="sect2">
-<h3 id="_viewing_flowfile_content">Viewing FlowFile Content</h3>
-
-</div>
-<div class="sect2">
-<h3 id="_replaying_a_flowfile">Replaying a FlowFile</h3>
-
-</div>
-<div class="sect2">
-<h3 id="_viewing_flowfile_lineage">Viewing FlowFile Lineage</h3>
-<div class="sect3">
-<h4 id="_find_parents">Find Parents</h4>
-
-</div>
-<div class="sect3">
-<h4 id="_expanding_an_event">Expanding an Event</h4>
-
-</div>
-</div>
-</div>
-</div>
-</div>
-<div id="footer">
-<div id="footer-text">
-Last updated 2014-12-19 12:44:48 EST
-</div>
-</div>
+<body>
+<a href="http://nifi.incubator.apache.org/docs/nifi-docs/user-guide.html">http://nifi.incubator.apache.org/docs/nifi-docs/user-guide.html</a>
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-</html>
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+</html>