Unable to return a scalar value for the expression nifi. This value must be exactly 1 character.

Unable to return a scalar value for the expression nifi PutFile //configure directory Hi guys, When I secure a three nodes nifi cluster, I got below errors during start up. if you have {"data": "{\"created_at -- the original scalar function CREATE FUNCTION dbo. I guess if every message must be unique, but I think with Expression Language there is probably an opportunity to decrease that I remove the http port from nifi. NIFI: get value from json. 0. When 'Destination' is set to 'flowfile-attribute,' a return type of 'scalar' will be used. . This allows you to quickly use the JOLT The NiFi Expression Language always begins with the start delimiter ${and ends with the end delimiter }. 77 5 5 bronze badges. Kusto: How to convert table value to scalar and return from user defined function. cloud. A value of 1 will return the first field, a value of 2 will return the second field, and so on. But it doesn't detect the value as null, rather considers it as empty string set. I've set the destination of EvaluateJsonPath as "flow-file attribute" and I added new properties with the required JsonPath. 174 Views 1 Kudo 1 ACCEPTED SOLUTION before the final PutSQL to delete all sql placeholder arguments with the following Regix in the "Delete Attribute Expression . Nifi - SplitJson retaining NiFi: Unable to read expression language variables from external properties files. Server [03/50] incubator-nifi git commit: Adjusting comments and providing a test to ensure a non-scalar value for a specified scalar return type is routed to failure. They do not communicate with one another to share cached data. In its most basic form, the Expression can consist of just an attribute name. json as Return type; Share. Flow: 1. "book": [ @Anil Reddy. (I checked a few). Here is what I have as an requirement. My logic is shown in a Scala code below. Will register this node to become the active Cluster Coordinator and will attempt to connect to cluster again [Heartbeat Monitor Thread-1] o. It returns the array from splitjson processor. fields. Apache Nifi: How to convert string (text/plain) to JSON type using Nifi processor? 3. I tried a Apr 21, 2017 · Hi I have created data flow which will transfer SQL server data from DB to DB in nifi and there a datetime column and it also contains some null value in source table, now i want to transfer that column with datetime value and also null You can't corralate scalar subquery expression with outer query. Here is my JSON. In this case, we reference the filename attribute and then manipulate this value by using the toUpper function. UPDATE: Detailed requirement: The Nifi If QueryText field value is not enclosed in any quote character, then it would be confusing for CSV parser whether to treat comma as delimiter or part of data. Benoit NIFI: Unable to extract values from JSON. input. name and active to $. These peers files allow a NiFi instance to share peer information across multiple identical S2S Jun 7, 2022 · This often happens upon restart of NiFi when running an embedded ZooKeeper. t2(@param1 INT) RETURNS TABLE AS RETURN (SELECT @param1 + 1 AS [r1], @param1 + 2 AS [r2]) GO -- the modified Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. This is because the output of ConvertRecord - CSVtoJSON is a record-oriented flow file (that is, a single flow file containing I have JSON objects coming into Nifi via MQTT from two different inputs - for instance, let's say one is from a top sensor, and one is from a bottom sensor. + "A Return Type of JSON can return scalar values if the provided JsonPath evaluates to the specified value and will be routed as a match. 1. I have updated the nifi. remote. Due to an oversight, the new module(s) were not included with the Groovy Jan 24, 2018 · @Anil Reddy. 1,203 9 9 silver badges 19 19 bronze badges. nifi: how to change value of json? 1. headers. In NiFi Expression Language (in UpdateAttribute for example), you can use substringBeforeLast(',('), that should return all the elements in the list except the last one. 7. For example, after creating Rooms, create this function that takes a room id and returns cost per hour:. c. Ask Question Asked 5 years ago. Apache Nifi: How to convert string (text/plain) to JSON type using Nifi processor? 1. I like compute these dates ONCE and to use them into the template as much as I need. To get more records, you can use ScrollElasticsearchHttp afterwards. My Idea is to do something like: dateStart = ${now():toNumber():minus(86400):format("YYYY-MM-dd'T'hh:mm:'00'")} then use ${dateStart} I'm working on a sample NiFi flow where I get a Json file as input. Commented 2019 at 14:02. Share. Unable to successfully use SQL processors after returning from batch processor group considering I'm am using NiFi version 2. org. If not specified, a comma will be used. Jan 6, 2022 · I am trying to split an JSON Object using split json processor but I am unable to do this I want key in my attribute and the attribute value will be JSON array. Dec 20, 2024 · In a slightly more complex example, we can instead return a manipulation of this value. Asking for help, clarification, or responding to other answers. parseLong. We can, for example, return an all Your expression language statement grabs the value from FlowFile Attribute "grn", passes it the escapeCsv NEL function and then appends a ";" to the returned result. do you know why? Hence the attribute always returns/set to false although the value is null Firstly, @OneCricketeer is correct that you have to use SplitJson processor for the same, but expression is very important in that. curl 'https://<nifi-server>:807 NiFi uses the setObject() method with the SQL type populated, and this method is not supported by the GridDB driver. Authentication issues 2022-06-16 11:50:05,119 WARN [Heartbeat Monitor Thread-1] o. How to split a json string value by character into some substrings in Apache Nifi. 1 Evaluate value of Public signup for this instance is disabled. create function f_get_Rooms_CostPerHour (@Room_ID int) returns money as return I need to extract the "json" value so that it looks like this after unescaping: {"created_at":"Sun Sep 24 11:10:52 +0000 2017"} I tried using JoltTransformJSON and EvaluateJsonPath, but both methods return this, with {" and "} at the beginning and end use EvaluateJsonPath with $. RouteText 3. Regexp Replace strategy. NET project, things are a bit confusing. Example: But Starting from NiFi-1. n. Egg: "superDate":"2021-03-07 23:59:00" Thanks in advance! you can use this sequence of processors: EvaluateJsonPath to get value of attribute, UpdateAttribute to change it, and ReplaceText to substitute old value in content with new one using regular expression. storyBoard. NiFi EvaluateJSONPath loop through array to get correct value. Splitting Json to multiple jsons in NIFI. There are a number of NiFi Expression language functions that work with Mar 23, 2017 · @Diego Labrador. NIFI: How to wait for all the previous processors to finish execution and then do something just once? 1 Get source/upstream connection's processor name in nifi I am trying to split an JSON Object using split json processor but I am unable to do this I want key in my attribute and the attribute value will be JSON array. You will have to create scalar functions first. But lets say that I have a stored proc that returns the value using a select statement: CREATE PROC spReturnNumber AS SELECT 1 Is it possible to get this value from within another stored proc? NIFI: Unable to extract values from JSON. The magic being done here is "Take value of group slap around it #{ and _value1 } to make it valid NiFi Expression Language statement and then evaluate it. client. 2 NiFi EvaluateJSONPath loop through array to get If input data is string, then try to get format string for it, and then if the format string is valid formatter, then get date using it. How to use user-defined scalar inside datatable creation in Kusto. You need to either perform explicit casting of the corresponding field with something like this: It will only return up to the value of index. Between the start and end delimiters is the text of the Expression itself. Report potential security issues privately The value of the property must be a valid JsonPath expression. Ask Question Asked 4 years, 9 months ago. NiFi convert json to csv using ConvertRecord. yourfield" You have just to configure the EvaluateJsonPath processor by changing the return type property value to We have multiple team nifi applications running in same nifi machine Is there an opportunity to combine those into a single PutEmail with parameterized values? – Andy. When your computed columns refer to other tables, you cannot implement this directly. For the ReplaceText processor use following parameters: . For example, ${filename} will return the value of the filename attribute. If you need the results in the content of the Evaluates one or more JsonPath expressions against the content of a FlowFile. "book": [ In NiFi 1. Created property name becomes the FlowFile attribute name and the resulting string Jan 8, 2025 · The value of the property must be a valid JsonPath expression. 0 0 how to make jsonpath work for name-value pair. xml to create again with my user, they are In NiFi, I have a JSON data coming in, and I am using SplitJson and EvaluateJson to store the required components of the Json data in my own variable. The results of those expressions are assigned to FlowFile Attributes or are written to the content of the + "If the JsonPath evaluates to a JSON array or JSON object and the Return Type is set to 'scalar' the FlowFile will be unmodified and will be routed to failure. " Despite extensive searching, I'm still unable to determine what "Variable Registry Only" means. 2. 1. But you have to type Basic syntax (&H000002287A44BDB0)!. Apache Nifi EvaluateJsonPath with Multiple Inputs . Ask Question Asked 6 years, 4 months ago. 0 JoltTransformJson Nifi expression language for jsonpath - string manipulation, split. Report potential security issues privately If you happen to be in a VB. This is the point. Is it a bug in NIFI? The answer in this StackOverflow post refers to documentation saying an array will be returned; this appears to be happening after the JSONPath is I'm trying to extract a value from JSON to a flowfile-attribute. Add a If QueryText field value is not enclosed in any quote character, then it would be confusing for CSV parser whether to treat comma as delimiter or part of data. The TLS is configured, ldap connection works when I'm not trying to configure an initial admin (obviously I can manage nifi). thats easy for some. Provide details and share your research! But avoid . Hot You can use the EvaluateJsonPath processor to evaluate JsonPath expressions against the content of the flowfile. Problem 1 So I'm using the evaluateJsonPath processor to add these values as attributes in my flowfile. A function call consists of 5 elements. As per the json provided by @Meghashaym, i would suggest to wrap the array into one NIFI: Unable to extract values from JSON. This "mini-language" does not support all fields/operators (see here for more details). " + "If Destination is flowfile-attribute and the expression matches EvaluateJsonPath unable to return a scalar. Route attribute value to dynamically save the files into Directories. I believe your issue is that you are trying to do this at the same effective time as defining the other attributes, so this I have a csv, which looks like this: name,code,age Himsara,9877,12 John,9437721,16 Razor,232,45 I have to replace the column code according to some regular expressions. 2023-02-13 13:27:57,134 WARN [Http Site-to-Site PeerSelector] o. Obs: I'm testing using a splitjson, but it only returns the value and I need the variable ocorrencias. " + "If Destination is 'flowfile-content' and the JsonPath does not evaluate to a defined path, the FlowFile will be routed to 'unmatched' without having its contents modified. jsonPath Expression for json and json of json parameter using NIFI expression Langauge . Each of the sensors has its own MQTT topic, so I am using two So the task is to be able to extract some json attribute values into a CSV format or a text format that will be used for inserting into file, db ,etc. username. Rodrigo Hajime Himauari Rodrigo Hajime Himauari. 5. Your AS statements are computed columns. thank you for your return. A Return Type of 'auto-detect' will make a determination based off the configured destination. Clear expression about dynamic fields: (ex: mySchema) and for the value, give the Avro schema expected for your input JSON. NOTE: QueryElasticsearchHttp expects a query that will work as the "q" parameter of the URL. 0 jsonPath Expression for json and json of json parameter using NIFI expression Langauge. New Contributor. Then you can work with expression language to get the value. Works fine with single element to be returned but when I add more properties and change to flow file attribute. nifi. Follow answered Jun 20, 2022 at 5:46. ProcessException: Unable to evaluate new value for attribute 'processing_end_time': In your case, you want to use the PutDatabaseRecord processor instead of ConvertJSONToSQL. Follow answered Mar 12, 2019 at Record does not have a value for the PrimaryKey column 'ID' Which is false because I can see the column and the value in the JSON FlowFile. I Need this value to generate a specific number of dummy files to insert flowfiles that are created later on. Unable to evaluate the expression. Improve this answer . Main difference between scalar subquery expression and corraleted subquery expression is that the first one can't be join. I use TLS tool to create certificates, and use client-certificate for authentication. delimiter: Optional argument that provides the character to use as a field I'm able to get the current timestamp using now() in NIFI. data expression. For ex: Property name: username, value: $. exception. CuratorLeaderElectionManager Unable to determine leader for role 'Cluster Coordinator'; returning null KeeperErrorCode = ConnectionLoss Oct 30, 2023 · The DistributedMapCacheServer starts up a separate Distributed Map Cache server on each host in the NiFi cluster. analytics-prod. 1 NIFI: Extract particular value from JSON array using EvaluateJsonPath Processor? 8 EvaluateJsonPath unable to return a scalar. How can I implement an if-elseif-else condition on the Json data value? For example, if attributeA==0, relationship = pass, else fail, and so on. Modified 3 months ago. Description: Parses the Subject as a delimited line of text and returns just a single field from that delimited text. I use EvaluateJsonPath processor to get the value of the desired path. Modified 6 years, 1 month ago. HandleHttpRequest -> RouteOnAttribute -> HandleHttpResponse My RouteOnAttribute property is test and value is ${http. ", you are having an authorization issue. If either format string is not specified, or it's not valid, then NiFi is trying to convert it using Long. I need to use wildcard syntax in a JSON path to return the color of the bike as a scalar value. password. e. tonykoval. Property Value A ${"B":isNull():ifElse(null, ${"B"})} But syntax checker gives a red curly brace at the end of the line (I've tried null, Null, NULL). We still need to keep literal jolt specification in property value. In Apache NiFi, My Mongo DB is returning Array of Objects as shown below [ { fname:john, city:Nyc }, { lname:doe, city:Nj } ] I am trying to assign the entire array of Objects to an Attrbiute using In NiFi-1. Check the below link for the nifi template and python codes to solve this issue: I am using the below Nifi processors. If the Nov 14, 2018 · In NiFi 1. If you join scalar subquery expression automaticly it changes in corraleted subquery expression. use 9$ instead of 3$ ${myattr:prepend('$$$$$'):append('$$$$$')} in expression language if you use 3$ are results as 1$ so we need to use 9$ if you want 3$ sign to be added to the attribute value. But lets say I need to give the attribute 'address' the value of "1234 Fulcrum lane". When 'Destination' is set to 'flowfile-content,' a return type of 'JSON' will be used. xml and authorizations. Oct 27, 2024 · The value of the property must be a valid JsonPath expression. The Memory window shows the address in C(++)/C# syntax (for instance 0x000002287A44BDB0). We can, for example, return an all upper-case version of the filename by calling the toUpper function: ${filename:toUpper()}. How to access a value in a kusto table at a specific row number and at a specific column number? 6. 0 Apache Nifi EvaluateJsonPath with Multiple Inputs. apache. For site-to-site, NiFi attempts to create peers files inside a "state" directory within the NiFi conf directory. l. At solution 2 I took the flowfile-content (json) and set it into an attribute. In addition you have to change the properties Destination 2021-02-09 11:34:47,421 ERROR [Timer-Driven Process Thread-5] o. asked Oct 25, 2022 at 11:56. Set the Destination value to flowfile-attribute to extract the value into an attribute which will be added to the flowfile, or flowfile-content to generate a new flowfile with the extracted I'm using Nifi's Expression Language to compute 2 dates in order to stick them into a template. 2 How to read the values of attributes in Apache NiFi. Any help much appreciated Set up the Nifi Workflow as shown below : Set your input directory in the GetFile Processor. In the first UpdateRecord Processor concatenate the flow and flow_id columns and assign it into flow. For instance if: #1: hostname = Mickey Mouse #2: The quick answer is that NiFi Expression Language is not supported in the script body or within a script file provided by an ExecuteScript property, but what you want can still definitely be done. The results of those expressions are assigned to FlowFile Attributes or are written to the content of the You could set the Destination to flowfile-attribute instead, then each JSON Path will be extracted to the named attribute value. All we need to do is to use the dynamic properties in RouteOnAttribute That returned value will then be used to change the existing value assigned to the FlowFile attribute "bytes" or create a new FlowFile attribute with property name "bytes" and assign the value to that. Use the evaluate json path processor configs as shown below, Now we are extracting all the text values from the hashtags array and keeping as flowfile attribute. Insert fails with: Record does not have a value for the Required I do the same as you suggested and for values like above with null, in the next step, i use the expression language like ${ATTR_NAME:isNull()} on UpdateAttribute processor. EvaluateJsonPath unable to return a scalar. xml is below: <accessPolicyProvider> <identifier>file-access-policy-provider</identifier> <class> Please note, that the return value of jsonPath is an array, "Unable to get a scalar value for expression $. I can just set name equal to $. By parsing the nifi log, you can separate the logs which is specific to your team applications, by using the processor group id and using Nifi Rest API. Correct: A,B. The setting in my authorizers. Follow edited Oct 27, 2022 at 7:21. We can, for For example, ${filename} will return the value of the filename attribute. attributes. a. I know the preferred method for returning scalar values from stored procs is either using RETURN or an OUTPUT parameter. Following other posts in HCC, I'm first using the below call to get the access token, which is successful, it returns a token. NiFi | Json Parsing using Nifi Expression. 0 JoltTransformJson processor not accepting attributes in jolt specification property value. I have a requirement to validate the flow file attribute value and route based on that. 0 (), which itself moved the date utils out to a module which is not included with groovy-all by default. Contact the system administrator. Even when you just press Enter inside the Address textbox on the existing value, you will get:. Hello, I'm getting the "Unable to validate the access token" when calling NiFi API, for all API end points that I checked. UpdateAttribute UpdateAttribute[id=e3d11ce6-327b-1b5b-e764-xxx] Failed to process session due to org. When I run the EvaluateJsonPath processor I get an error stating "Unable to get a scalar value for expression $. properties with the following. mc NiFi Expression Language has a hostname function that can return the fully qualified hostname: You could add a user-defined property to the config of InvokeHttp and set the value to ${hostname(true)} and then make sure to include that property name as one of the properties to send as a header. properties, delete the users. Viewed 1k times 1 . + "A Return Type of JSON can For example, $ {filename} will return the value of the filename attribute. com:443 to determine which node(s) exist in the I am currently using a function in SQL Server to get the max-value of a certain column. Am I forced to hard-code the kerberos values? I have got json file with nested structure. In such case you have to write a custom cleaning script before the ConvertRecord processor to escape comma belongs to data part, but again how does your custom script will know that whether comma is Unable to get scalar value of a query on cosmos db in azure data factory. Use the ERP/MARKETING connections connect to PutFile processor and use RouteText. Evaluate value of JSON Key using NIFI. PeerSelector Could not communicate with nifi2. p. Modified 9 months ago. I am trying to get the I'm trying to configure ldap authentication on Apache Nifi 1. Viewed 440 times 0 I am trying to externalize the hard coded values into a properties file and use expression language syntax in my nifi workflows. 10 we updated Groovy to 2. How do I assign that attribute the proper charVal value that matches up with the Join the Cloudera Community where our members learn, share and collaborate on the use of our hybrid data platform. Do this by At solution 1 the value is set into an array. And if I run it anyway, I get a processor exception - unable to evaluate expression due to Unexpected token 'null'. Share Improve this answer Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; I am new to apache nifi, expression languages. 7), it says that the fields only support "Variable Registry Only. jsonPath Expression for json and json of json parameter using NIFI expression Langauge. Arguments: index: The index of the field to return. Improve this question. Reply. delimiter: Optional argument that provides the character to use as a field separator. Due to an oversight, the new module(s) were not included with the Groovy index: The index of the field to return. Search Value : (?s)("version"\s*:\s*)(\d+) Replacement Value : You can absolutely evaluate other attributes within the Expression Language of Apache NiFi. what expression should be given for getting yesterday's timestamp at NIFI processor. Anytime you encounter the message "Unable to perform the desired action due to insufficient permissions. I use splitjson first and then evaluatejsonpath processor to select element I am interested in. If the Dec 7, 2019 · @xpelive . However, the problem is that when I use wildcard syntax with the Evaluates one or more JsonPath expressions against the content of a FlowFile. This value must be exactly 1 character. Apache Nifi - ConvertJSONToSQL - JSON Does not have a value for the required column. 4. Kusto query (KQL) iterate over scalar values in subquery. file defined? Is it a user-defined property on the ExecuteScript processor? If so, the problem is getting access to a variable that has Groovy i have a stream of json in apache nifi that contain dynamic fields (maximum 11 fields) and i want to convert it to csv file. GetFile 2. properties, change the Inital Admin Identity, use the same that is in the Manager DN in nifi. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Aug 10, 2017 · Hi I have created data flow which will transfer SQL server data from DB to DB in nifi and there a datetime column and it also contains some null value in source table, now i want to transfer that column with datetime value and also null values same time to Jan 26, 2017 · NULL indicates there is no value set, while EMPTY means a value of type new line, carriage return, tab, or space has been set as the value. You add one user-defined property per value you want to extract. In such case you have to write a custom cleaning script before the ConvertRecord processor to escape comma belongs to data part, but again how does your custom script will know that whether comma is Public signup for this instance is disabled. Improve this answer. " (Notice - the word hash and function replace is there since I Hello all Within NiFi, updateAttribute processor I am trying to change an attribute called 'hive_database' based on the value of another attribute called 'hostname'. type:contains('test')} I have attached nifi template in this url nifi template The processor can make use of Nifi expression language and attributes in both left or right hand side of the specification syntax. json; extract; etl; apache-nifi; Share . 0-M4, is there a bug somewhere? Thanks. max_result_window for that index. (You can use InferAvroSchema processor to generate Avro schema for your JSON) i have a attribute (that produced by a REST service and catched by invokeHTTP processor) in JSON format like this: test => {"key":"value"} and then i want to put it in flows JSON content using NIFI: Unable to extract values from JSON. t1(@param1 INT) RETURNS INT AS BEGIN RETURN @param1 + 1 END GO -- a new table valued function, that returns 2 values in a single row CREATE FUNCTION dbo. 0. Jan 16, 2020 · Nifi Extract Text - Match on text and return the characters that follow Labels: Labels: Apache NiFi; JamesE. 0 Specify alternate JSONpaths. active. In a slightly more complex example, we can instead return a manipulation of this value. It may be possible for NiFi to catch this and instead try one of the supported methods, feel free to file a Jira for this improvement. CuratorLeaderElectionManager Unable to determine leader for role 'Cluster Coordinator'; returning null . But I want to get the yesterday's timestamp in the below format and could not achieve it. Now, I will be needing 'Return Type' to 'json' If EvaluateJsonPath processor could not find the field or element, then the value of dynamic property will be set to empty string. How is config. processor. Viewed 1k times Part of Microsoft Azure Collective 3 . 6. how to make jsonpath work for name-value pair. -NiFi The Nifi documentation says that these fields support expression language, but in Nifi itself (version 1. Posted to commits@nifi. Go to our Self serve sign up page to request an account. So here is what i got so far: How do I assign array of Objects as value to an Attribute in Apache NiFi. fvxgj djpw llpgu txrt xfajhnal cqaov sag akgzf dihb nbow