<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>UpdateAttribute</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">UpdateAttribute</h1><h2>Description: </h2><p>Updates the Attributes for a FlowFile by using the Attribute Expression Language and/or deletes the attributes based on a regular expression</p><p><a href="additionalDetails.html">Additional Details...</a></p><h3>Tags: </h3><p>attributes, modification, update, delete, Attribute Expression Language, state</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Display Name</th><th>API Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name">Delete Attributes Expression</td><td>Delete Attributes Expression</td><td></td><td id="allowable-values"></td><td id="description">Regular expression for attributes to be deleted from FlowFiles.  Existing attributes that match will be deleted regardless of whether they are updated by this processor.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Store State</strong></td><td>Store State</td><td id="default-value">Do not store state</td><td id="allowable-values"><ul><li>Do not store state</li><li>Store state locally</li></ul></td><td id="description">Select whether or not state will be stored. Selecting 'Stateless' will offer the default functionality of purely updating the attributes on a FlowFile in a stateless manner. Selecting a stateful option will not only store the attributes on the FlowFile but also in the Processors state. See the 'Stateful Usage' topic of the 'Additional Details' section of this processor's documentation for more information</td></tr><tr><td id="name">Stateful Variables Initial Value</td><td>Stateful Variables Initial Value</td><td></td><td id="allowable-values"></td><td id="description">If using state to set/reference variables then this value is used to set the initial value of the stateful variable. This will only be used in the @OnScheduled method when state does not contain a value for the variable. This is required if running statefully but can be empty if needed.</td></tr><tr><td id="name"><strong>Cache Value Lookup Cache Size</strong></td><td>canonical-value-lookup-cache-size</td><td id="default-value">100</td><td id="allowable-values"></td><td id="description">Specifies how many canonical lookup values should be stored in the cache</td></tr></table><h3>Dynamic Properties: </h3><p>Supports Sensitive Dynamic Properties: <strong>No</strong></p><p>Dynamic Properties allow the user to specify both the name and value of a property.<table id="dynamic-properties"><tr><th>Name</th><th>Value</th><th>Description</th></tr><tr><td id="name">A FlowFile attribute to update</td><td id="value">The value to set it to</td><td>Updates a FlowFile attribute specified by the Dynamic Property's key with the value specified by the Dynamic Property's value<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr></table></p><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>All successful FlowFiles are routed to this relationship</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3><table id="writes-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>See additional details</td><td>This processor may write or remove zero or more attributes as described in additional details</td></tr></table><h3>State management: </h3><table id="stateful"><tr><th>Scope</th><th>Description</th></tr><tr><td>LOCAL</td><td>Gives the option to store values not only on the FlowFile but as stateful variables to be referenced in a recursive manner.</td></tr></table><h3>Restricted: </h3>This component is not restricted.<h3>Input requirement: </h3>This component requires an incoming relationship.<h3>System Resource Considerations:</h3>None specified.</body></html>