Nifi compare two flow files. Mar 28, 2024 · existing content(123_456.

Nifi compare two flow files A sample of my flow is here: Jun 17, 2020 · 2. PutHDFS. Therefore both of them have the same filename. Apr 12, 2018 · Sivaprasanna's answer is excellent, and to head off one potential question, to be able to determine which "follow-on" flow to send the flowfile to after it exits the process group, add an attribute in the initial "unique" part of the flow (i. stdin. Everything seems to be Mar 28, 2024 · existing content(123_456. After that send mail depending on success or failure condition Is there any easy way to do that in Apache NIFI. 245. The point is passing the same JSON flow-file into two EvaluateJsonPath processors, then each EvaluateJsonPath extract array based on its own interest, using JSON path like '$. properties as: trigger. (It will be key-value pair in cache, so use key as FALL_ID and value as whole flow file content. Processor A get triggered with single flow file which comes to it scheduled intervals. 33 trigger. However I'm having trouble with the last step that in my mind should be merging the email flow file with a copy of the template one (so I don't have to fetch the template repeatedly) and feeding the Mar 6, 2022 · I have a nested json with few first level keys. Sep 7, 2017 · Are you trying to see if all attributes from both FlowFiles match exactly or is their a specific attribute from each FlowFile you want to compare? My initial thought would be to use the DetectDuplicate processor. target. [?(@. You could write the unique attribute to the DistributedMapCache service. May 17, 2019 · That is the best guidance from us (Apache NiFi team) on the subject. Dec 20, 2024 · Often times, we will need to compare the values of two different attributes to each other. May 29, 2024 · I have two flow flies and i want to read those two flow files in to groovy script and i am using the below line in my groovy to read the flow file content, but how do i know which flow file i am reading here, actually i want to compare two flow file content line by line in groovy and if the content is different then only i need to send the May 22, 2021 · Nifi is evaluating the query without replacing the content of the ${author} EL syntax. txt” and the other for “two. ) Dec 11, 2017 · I am trying using NIFI to detect duplicates based on 2 attributes of flow files such that per second there should not be any duplicate rows, whose 2 particular attribute values are same. file system) and May 9, 2018 · I've another set of attributes defined in nifi. If you want to learn more about the ExecuteScript processor, refer to the ExecuteScript Cookbook. What I have tried so far : getfile-->evaluate json path(to get the two keys before and after)-->route on attributes Jun 12, 2019 · Is it possible to compare two csv files in nifi(1. topic} since all the flow files from the same kafka Sep 25, 2018 · It's not an issue in my case, because I do filtering before processing flow file content and my SQL query is based entirely on the flow file attributes and not on its content. import pandas as pd import sys input = sys. . Sep 7, 2018 · How to compare one flow file attribute with other flow file attribute. I don't care the order or the attribute, I just need limit the number. Supose you recieve every minute a json with a timestamp and you want to calculate the difference between the a Oct 22, 2024 · This Article would elaborate how you could merge two files using MergeContent processor in Apache NiFi using a corelation attribute. value. 44. For instance, if a file is picked up from a local file system using the GetFile Processor, the contents of the file will become the contents of the FlowFile. e. 3. tag it with some logical "flow identifier") or use an inherent value from the source (i. When opening a pull request, it is expected from the author to clearly describe the changes that are submitted but the reviewers of the pull request would also look at the differences between the two JSON files to accept or not the Apr 5, 2021 · Yes. – Feb 20, 2018 · So far I have a structure that is able to fetch all 3 files, integrate the first 2 in a series of flow files that represents each email to be sent. The source could be flat files and Teradata database and the output sink would be Oracle database. We can, for example, check if the filename attribute is the same as the uuid attribute: ${filename:equals( ${uuid} )} . merging of flow files in the specified order. NiFi Home --> First --> Second Which would be the approach to see the differences, besides going from Sep 2, 2018 · NiFi: Merge an Attribute into the Flow-file's JSON Content (without overwriting the entire flowfile) 0 Merge json flowfiles in NiFi using Executescript with Javascript Nov 7, 2018 · I have a flow that creates some new attributes / content. After getting this request, the processor reads the data from source like DB & produces output flow files for each 100 records from source which sent to processor B for writing in SFTP. The content portion of the FlowFile represents the data on which to operate. system. Finally you merge all the lines into a single CSV file: Set CSV reader and writer. we are creating new flow files for input flow file. Here’s a step-by-step guide on how to do it: Input Setup: Use two GetFile processors to read the content of the two files, one for “one. 7) using groovy script? One file is at SFTP server and other is flow file. txt. Jun 26, 2023 · Flow files in NiFi are made of two major components, attributes and content. We have around 5-deep layers. 1. Update: I have try to set correlation attribute to ${kafka. a=='2')]'. Dec 20, 2024 · A FlowFile is comprised of two major pieces: content and attributes. Attributes are metadata about the content / flow file, and we saw how to manipulate them using ExecuteScript in Part 1 of this series. linux. csv Oct 13, 2016 · If you want to split the example JSON into two flow-files, each contains an array of elements with a=1, or a=2, then following flow can do the job. Andy's solution, fileSize is universally applicable. In DetectDuplicate processor, following are the entries of my processor: CacheEntryIdentifier: ${attribute1_name}::${attribute2_name} Age of Duration: 1 sec Jun 24, 2020 · Below is the flow that I'm working on. it was read from "database A") and then use a Mar 23, 2021 · I want to compare and calculate the elapsed time between 2 dates from diferent flows. Though in a more general scenario, when the flow file content is modified by the incoming part of the flow, one should save file content somewhere (e. Oct 9, 2020 · I want to compare two different environments (Prod, Dev). The flow that I’m going to demonstrate is simple. I want to compare two keys before and after in that json to see if the states are matching or not. I send the two files to the mergeRecord Processor. Sep 2, 2021 · The code below won't work since its anyway in the same flow file and my InferAvroSchema is not able to handle this separated. May 28, 2019 · Convert kafka message to one line string in one flow file. ” Configure the processors to specify the directory where the files are Nov 8, 2024 · Datavolo is proud to announce the release of a GitHub Action designed to help with Continuous Integration of Apache NiFi Flows and make reviewing of changes between two flow versions as easy as possible. If the states match then route to update api else insert api. I've configured Execu Mar 2, 2017 · I’m planning to use Apache Nifi for a Data Ingestion use case. csv) from db A 3000 AAA008 A 3001 AAA008 A 3002 AAA008 A 3003 AAA008 A 3005 AAA008 A 3006 AAA008 A 3007 AAA008 A 3008 AAA008 A 3009 AAA008 A 3010 AAA008 A 3011 AAA008 A 3012 AAA008(This record is deleted in the new file from the flow file, so i dont need to consider this from the new file) Flow file content(123_456. As it should be one file at the end. password=Passw0rd I'm trying to compare the user entered value with the attribute value present in properties file. I have created few flows to read data from flat files using GetFile and Teradata database using ExecuteSQL and load the data to Oracle database using PutSQL. Dec 21, 2018 · HashContent will create a hash of the flow file content and put it in an attribute called hash. I want to take an attribute from the flow files, and add it into the JSON content of the file. 6. csv has to be available on your NiFi instance. Leave their default properties. g. DetectDuplicate will check a cache of hashed values to see if the same hash exists and then route it to the appropriate relationship (duplicate or non-duplicate). I can use AttributesToJSON, but that just overwrites the file content. Cache the first flow file content in to cache with key as ' FALLA_ID' value and merge when second flow file arrives : - Use NiFi DistributedMap Cache (or any other external cache like Ignite) to cache the first flow. name=10. I am confused as to why it says to have a file with the same name. Jan 15, 2024 · You can compare the contents of two files in Apache NiFi using the CompareContent processor. We are able to accomplish this by using embedded Expressions. readlines() #searching for subfiles and saving them to a list with files Oct 30, 2019 · /home/nifi/mapping. Sep 19, 2017 · Merge two JSON flowfile together in NiFi. InvokeHTTP-->ExecuteScript-->ExecuteSQL From invoke HTTP, I'm getting two flow files one with request and another with a response. The answer marked "correct" only applies in a few cases where Content-Length is set by an upstream processor. Nov 27, 2019 · I have a csv file which I break into two flowfiles and process independently. Problem is similar to that of link given below. Merge multiple flow files into one. Expression Language not supported One way to counter this in your case would be to split the JSON at the Array level (using SplitJSON) and then to route only on the array element that match the following RegExp (using RouteOnContent) : "author" *: *"${author Nov 8, 2024 · In NiFi, a flow definition is a JSON file and comparing two JSON files might not be the easiest thing to do. Merging identical flow files while saving unique attributes in Nifi. Now I'm stuck at step 3, I can not merge them one by one. qrq wzupxm salgc yutfqw hjcc kwccaw kyfvdf pexkv neyhv swtsr