In the above expression language we are checking any id, age attribute having empty values for them and routing them to emptyattribute relation. ${allAttributes("id","age"):isEmpty()} By using and function ${id:isEmpty():and(${age:isEmpty()})} this expression routes only when both id,age Description. Relationship Name. Attribute Expression Language. Routes FlowFiles whose attributes match the Attribute Expression Language specified in the Dynamic Property Value to the Relationship specified in the Dynamic Property Key. Supports Expression Language: true (will be evaluated using flow file attributes and Environment variables) We use Apache Nifi for our data ingestion. We extract data from multiple sources, especially oracle databases. A lot of the extracted tables contain timestamps The NiFi Expression Language always begins with the start delimiter and ends with the end delimiter. Between the start and end delimiters is the text of the Expression itself. In its most basic form, the Expression can consist of just an attribute name. For example, $ {filename} will return the value of the The NiFi Expression Language provides the ability to reference these attributes, compare them to other values, and manipulate their values. Structure of a NiFi Expression The Use the below expression in ROUTE1 property value. ROUTE1 ${literal(${[HOST]:equals('XXX'):and(${txt:contains('YES')})}):or(${[HOST]:equals('YYY'):and(${txt:contains('NO')})})}
Expression Language with Jolt in Apache NiFi - Cloudera Community
Overview. All data in Apache NiFi is represented by an abstraction called a FlowFile. A FlowFile is comprised of two major pieces: content and attributes. The content portion of Plus the updateAttribute processor can only manipulate FlowFile attributes via the NiFi Expression Language (EL). So you need to extract the json value to a FlowFile attribute in the EvaluateJsonPath processor. Then manipulate that attributes value and then use UpdateRecord to update the actual content of your FlowFile using that I have tried to achieve this using the UpdateAttribute process configured as follows: Property Value. A ${"B":isNull():ifElse(null, ${"B"})} But syntax checker gives a red curly brace at the end of the line (I've tried null, Null, NULL). And if I run it anyway, I get a processor exception - unable to evaluate expression due to Unexpected token
Solved: NiFi Expression - Multiple OR - Cloudera Community
1 ACCEPTED SOLUTION. The NiFi expression Language is used to evaluate and operate against the attributes of a FlowFile, Variable Registry key/value pair, a NiFi JVM pre-defined property, or a pre-defined system environment variable. What you are trying to operate against is the content of a FlowFile. Processor like RouteText and You are writing a NiFi Expression Language (NEL) statement to an attribute via your python script so it is not being evaluated by the NEL process. I am not clear on The ${} in the second part of that string is NiFi Expression Language. This adds the value of the attribute twitterFilterAttribute to the string. Once you have entered the regular expression, click the OK button. You should see something similar to this: You don't need to change any other settings. Click the APPLY button It should be possible to do all the if/else logic in a single NiFi Expression Language string. Sometimes the issue could be a simple (: or ' missing or misplaced. However, I would maybe do this a different way. Create your different combined attributes upstream from the isEmpty logic SplitText with a Line Count of 1 is generally the approach to split a text file line-by-line. It will use \r, \n, or \r\n as the end of a line. ExtractText would be used to parse each line and extract parts of the line into flow file attributes. You need to come up with a regular expression that uses capture groups to capture the parts you are Apache NiFi Expression Language Overview. All data in Apache NiFi is represented by an abstraction called a FlowFile. A FlowFile is comprised of two major