Nifi rename attribute You may also use expression language such as ${file. If you are using GetFile then it also has file. OBX_1. The individual processor configurations are below: GenerateFlowFile: This generates a flow file with some content. The incoming jpg file has a GUID. csv (original name) + january (name that provides the inc Jul 6, 2017 · I am aware of how to delete a single attribute in Nifi, but what is the proper syntax to delete multiple attributes? Do I have to use multiple UpdateAttributes transformations or is there a delimit Mar 8, 2023 · I'm wondering if there is any way to rename the field by concatenating the values of JSON attributes into existing attribute names using JOLT transformation Aug 12, 2016 · NiFi supports several methods of creating and updating attributes, depending on the data source you wish to use. I thought I could simply use the UpdateAttribute Processor to set my attribute to '["arrayItem1", "arrayItem2"]' and then I could used AttributeToJSON to convert the attribute to JSON and it would convert to an array. Sep 30, 2021 · The only Attribute it reads by default is filename - please see the Reads Attributes section of the docs. gz file. 1. 0 JoltTransformJson processor not accepting attributes in jolt specification property value. NiFi keeps all of the attributes of the flow files in the graph in the JVM memory configured in the bootstrap. Create your different combined attributes upstream from the isEmpty logic. You might be able to refine this to perform all substitutions in a single pass, but after fuzzing the regex with the look-ahead and look-behind groups for a few minutes, re-routing was fast Jul 3, 2018 · I would like to be able to do something similar to the following where I loop through all key-value pairs and if the key has value zero then replace it to any numerical value. I believe you could eventually craft a regular expression which would match what you are looking for, but as you note, the performance is not going to be good, and if a larger flowfile came in, you may crash the heap. 0, the NiFi: Merge an Attribute into the Flow-file's JSON Content (without overwriting the entire flowfile) Rename JSON field in NiFi flow. – Aug 31, 2018 · I created a template using ReplaceText and RouteOnContent to perform this task. However, the below example only works with the top level attributes and does not allow modifying or removing a specific key-value pair in the attribute value. 832 -0800. Nov 18, 2019 · Simply add a property, e. For example, $ {filename} will return the value of the filename attribute. For complete listing of the core attributes check out the FlowFile section of the Developer’s Guide. Seems from the code that it uses the uuid attribute. Aug 11, 2017 · Apache NiFi, write attribute to flowfile content. Please suggest any procesor in nifi which is suitable for my case. . Now in reader controller service use the Schema Access strategy as Use Schema Name Property and Schema Registry as AvroSchemaRegistry` that has already setup. Hot Network Questions Covering a smoke alarm horn How to achieve infinite rage? Body/shell of bottom bracket cartridge stuck inside Aug 17, 2019 · We cannot change the existing filename in HDFS but we can do alternate solution in NiFi as below. log) using expression language and possibly UpdateAttribute processor? Dec 18, 2018 · A more dynamic answer when using UpdateAttribute is to use NiFi expressions to change the filename: So to change dynamc_name. You can however, change the uuid attribute using UpdateAttribute as @Andy mentioned. txt” appended to the end of it, add a new property and make the property name “filename” (to reference the desired attribute), and as the value, use the NiFi Expression Language statement shown below: So it definitely looks like I will need a way to rename the fields so they don't contain spaces (to be Avro friendly and renamed to be the right field names for data import. I then want to rename the file with this new filename. EvaluateJsonFlow //Extract all json data attributes as flowfile attributes 3 Aug 1, 2018 · ListFile will generate a flow file for each file it finds in the directory, but the flow file will not have any content, it will just put the filename in an attribute. It will do the Update and then the Delete - so it effectively renames the attribute. Provide a name, like latestTimestamp or lastProcessedTime Configure RouteOnAttribute Feb 21, 2018 · The date. Sep 3, 2020 · Depending on what processor you used to get the tar. In the documentation,I see notes about renaming attributes using dynamic properties. Mar 3, 2019 · You cannot change the uuid of a FlowFile. In addition if you want to keep this attributes unique then you can add the timestamp value at the end like. e. ip":"192. Note on many operating systems Nifi must be running as a super-user to have the permissions to set the file owner. Supports Expression Language: true (will be evaluated using flow file attributes and variable registry) Group Jun 23, 2017 · As of NiFi 1. 0. 0. If you have an existing Attibute, and you want to push the value of this Attribute into the metadata, you must add a Dynamic Property to PutS3Object and reference the value of the Attribute. Sometimes the issue could be a simple (, :, or ' missing or misplaced. name attribute(for ex: with value sch) to the flowfile. For example, to rename the `addr` field to whatever value is stored in the `preferred_address_name` attribute, add a property with a name of `/name` and a value of `${preferred_address_name}`. *$)" and ReplacementValue of "$1,"version":"${version}"". Apache NiFi: Adding flow file attribute to ExecuteStreamCommand processor. Any other Jun 22, 2018 · You can use the following flow as an example to achieve the regex replacement. json. owner}. The 2nd step changes the filename property with the cu Nov 30, 2018 · I am trying to modify the name of some files with NiFi getting a value from a JSON an adding to the original filename (for example filename. The FlowFile will also have an attribute named uuid, which is a unique identifier for this FlowFile. 8. But I am not sure how to set it up in NIFI. OBX_8. First use a ReplaceText processor to append the desired flow-file attribute to the file-content. Dec 23, 2020 · You would then add two custom dynamic properties where you would use NiFi Expression Language to populate the values from other attributes/metadata on the source FlowFile: You could then configure your AttributesToJson processor to build the JSON content using only those two new attributes you just constructed: Jul 19, 2019 · Depends what the format of the content is and where you want the attribute to go. Jan 2, 2020 · I have some files in my sftp path and i want to rename the files in same location using Ni-Fi. Apr 18, 2016 · According to the documentation, I think you need a single processor to feed the MergeContent processor so you can use an empty updateAttribute processor. Solution 2 - complicated and uglier Use a sequence Nifi ReplaceText Processor. Apr 18, 2016 · Hi, I am new to NiFi and want to rename a file based on a SQL query. Example: But Starting from NiFi-1. 0+, Matt's way is better. Set your NiFi UpdateAttribute filename to: ${filename:substring(0,11). Many properties can be added following this pattern in order to rename multiple fields. 1"} As an example, to alter the standard "filename" attribute so that it has ". we can use ${mapping} starting from How do I rename a NiFi attribute. So {"host. Update Attribute . json} Sep 5, 2017 · You can use an UpdateAttribute processor to provide whatever value you like for this attribute. EDIT-1: Date:${now():format('yyyyMMdd') As an example, to alter the standard "filename" attribute so that it has ". 0 JoltTransformJson processor will be evaluated using flow file attributes and variable registry. You can add as many properties with one processor. Oct 21, 2024 · Additionally, the FlowFile will have a path attribute that reflects the directory on the file system that this file lived in. After UpdateAttribute processor use AttributesToJson processor and recreate your Output JSON content. You're probably wanting to also route the original file to an UpdateAttribute processor which replaces the filename attribute with the name extracted from the AVRO the sql query produces. 1"} -> {"host_ip":"192. Combined with the NiFi Schema Registry, this gives NiFi the ability to traverse, recurse, transform, and modify nearly any data format that can be described in AVRO or, using JSON as an intermediary step. replace_text_processor_1. Jan 7, 2019 · In NiFi-1. Additional Details Tags: attributes, modification, update, delete, Attribute Expression Language, state. attribute} will make the flow file content be the value of my. Supports Expression Language: true (will be evaluated using flow file attributes and variable registry) Order Attribute: order-attribute: A name of FlowFile attribute whose value will be used to enforce order of FlowFiles within a group. Should these be set under properties as key value pairs? Jun 11, 2019 · There are many processors which can manipulate the content of a flowfile, but the simplest processors would be GenerateFlowFile (to create a flowfile with custom static/dynamic text) and ReplaceText (to replace the content of an existing flowfile). 1 --> OBX_8_Set ID. jpg filename which I then extract the filename and query a table which returns the new filename. If you just want simply get an attribute value in the content and replace whatever was there, then ReplaceText with the Replacement Value of ${my. " as I am inserting into MongoDB which does not support periods in key names. SSS Z')} which will result in content like This is a message generated at 2018/02/21 09:25:16. we are going to update the filename before putparquet processor so that everytime when file goes to putparquet processor will have same file name every time. In a slightly more complex example, we can instead return a manipulation of this value. For example, I used a GenerateFlowFile processor to create flowfiles which contain the text This is a message generated at ${now():format('yyyy/MM/dd HH:mm:ss. If a FlowFile does not have this attribute, or its value is not an integer, the FlowFile will be routed to Dec 16, 2019 · NiFi Version 1. If you are generating a totally new JSON, this May 4, 2017 · How to parse the NiFi filename attribute that has embedded directory information ( a/b/c/file. Nov 1, 2017 · Note: If using a version of Apache NiFi 1. Any FlowFile that could not be fetched from the file system due to the user running NiFi not having sufficient permissions will be transferred to this Relationship. 0 attribute is what you are likely interested in. This list of attributes is case sensitive. – Adam Commented Jan 26, 2019 at 20:47 Jun 2, 2017 · i tried with update attribute to include version with the value of 8(static) and then replacetext with the properties of SearchValue of "(?s)(^. Apr 8, 2017 · Having a large number of flow files with very large attributes will require a large size JVM for NiFi to run smoothly. So the basic flow would be something like - ListFile => FetchFile => UpdateAttribute (derive desired filename) OR GetFile => UpdateAttribute May 30, 2020 · It should be possible to do all the if/else logic in a single NiFi Expression Language string. Dec 10, 2018 · In the existing flow you are changing the value of the attribute associated to the flowfile not the actual content of the flowfile. attribute. Mar 3, 2021 · You can use 1 UpdateAttribute processor to create a new Attribute called B with the value of A, then add A to the "Delete Attributes Expression". g. Attributes Regular Expression: attributes-to-json-regex: Regular expression that will be evaluated against the flow file attributes to select the matching attributes. One option is to use an ExecuteStreamCommand processor with a custom script to accomplish this use case. Thanks in Advance. Oct 21, 2024 · In its most basic form, the Expression can consist of just an attribute name. I'm trying to build our my json, and one of my fields needs to be an array. log ) and extract only the file name (file. Jan 10, 2022 · 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'. flow file contents) with ${filename}. com/watch?v=yEE7Tgc4bh8 --~--NiFi a Apache project supports powerful and sca Supports Expression Language: true (will be evaluated using flow file attributes and variable registry) Move Conflict Strategy: Move Conflict Strategy: Rename: Rename ; Replace File ; Keep Existing ; Fail Aug 21, 2018 · Put Cache Value In Attribute - Whatever name you give here will be added as a FlowFile attribute with its value being the Cache value. Jul 20, 2022 · Have a look at Apache NiFi Expression Language Guide to extract date/time part from file. Supports Expression Language: true (will be evaluated using flow file attributes and variable registry) Destination: destination: flowfile-attribute: flowfile-attribute Jun 28, 2017 · I am trying to convert an avro object from one schema to another and rename few attributes using NIFI ConvertAvroSchema. Updates the Attributes for a FlowFile by using the Attribute Expression Language and/or deletes the attributes based on a regular expression. Our output flowfile will be in avro format to view the flowfile content we are using ConvertAvroToJSON processor to view each processor output. new_attribute ${tab_name}_${fragment. My recommendation would be to use an ExecuteScript processor and use Groovy to do this. Jolt Spec - How to insert element into Array. D Date:${now():format('yyyyMMdd') Then finally use routeonattribute to check like below. 7. UpdateAttributeConfigs:-in delete attribute expression mentioned id,age attributes need to delete. conf file. The final output will contain a combination of matches found in the ATTRIBUTE_LIST and ATTRIBUTE_REGEX. How to rename a flow in NiFi Sep 21, 2017 · it means: taking the value from a certain Attribute to update all other attributes. failure Any FlowFile that could not be fetched from the file system for any reason other than insufficient permissions or the file not existing will be transferred to this Relationship. 168. Feb 12, 2019 · If the attribute is named json then this should work: Update Json-Attributes in Apache-Nifi: Jolt. 2 --> OBX_1_ValueType. D' in one attribute name like below. May 29, 2019 · This is the question about MergeContent processor in Nifi. 2. For instance if: #1: hostname = Mickey Mouse #2: hostname = James Bond I want to use a 'contains' statement (or similar ) to cha May 18, 2018 · This worked for me even when storing the entire JSON, path of "$", in a flow-file attribute. index}_${now():toNumber()} Jan 2, 2020 · Since my attributes are set on the fly based on the spark processing result, I can't simply add to the variable registry and restart nodes for each flowfile (which from my limited understanding is what using the variable registry requires). 2 --> OBX_8_ValueType. Use Empty Relationship and connect that to Update Attribute processor and delete the attributes that you want to delete. After unpacking you may find that the filename attribute is overwritten (not sure though), so before unpacking, copy the filename attribute into some other attribute using UpdateAttribute. 1 --> OBX_1_Set ID. txt" appended to the end of it, add a new property and make the property name "filename" (to reference the desired attribute), and as the value, use the NiFi Expression Language statement shown below: "Nifi - Using Jolt Transform Json to prepare your Big Data " https://www. ConsumeKafkaData 2. However, I would maybe do this a different way. This property can be used in combination with the attributes list property. Dec 11, 2018 · After GetFile Processor use UpdateAttribute processor and add schema. creationTime attribute. The loop is required because the regex only replaces the first . If an attribute specified in the list is not found it will be be emitted to the resulting JSON with an empty string or NULL value. 0 Jun 6, 2018 · I'm assuming the tab_name is the table name attribute and Add new property in update attribute processor and . Requirements: Only field names are modified, not content. gz file, you likely already have a FlowFile attribute called filename set to the name of the tar. . 3. We still need to keep literal jolt specification in property value. 6. Flow: 1. txt to dynamc_name. Mar 1, 2018 · I have json content streaming in, and I would like to rename the field names, specifically I need to remove ". You need to use UpdateAttribute processor before PutParquet processor. But not for my case What I've done so far: I have set each Attribute using evaluateJSONPath processor. GetFile will read the original filename of the file on disk into this attribute, but because FetchFile expects the filename as an incoming attribute on the flowfile, it does not write the value back as an attribute. Then you can use ReplaceText to replace the entire text (i. youtube. fileStartsWith:Incoming. Currently, I need to combine all flowfiles with one particular attribute in one shot manner. Sets the owner on the output file to the value of this attribute. 1. I could find examples using JoltTransformer-Processor that works well when the update is only adding a string. txt" appended to the end of it, add a new property and make the property name "filename" (to reference the desired attribute), and as the value, use the NiFi Expression Language statement shown below: Property: filename May 8, 2016 · So, using an UpdateAttributes processor, I'm able to rename the columns as follows: OBX_1. in the JSON key on each pass. Dec 23, 2020 · In AttributesToJSON processor configuration there is option to extract pipeline attributes and can create json files/object, if we set Include Core Attributes to true, it will read some of the file properties and forms the json file. Feb 17, 2018 · I'd recommend using a different format for the incoming template (something NiFi doesn't automatically interpret as Expression Language) and then use a ReplaceText processor to substitute the attribute values (use a regex pattern to identify all variables in the template and use the capture group to replace them with an arbitrary attribute named the same thing). Aug 1, 2017 · I use a GetHTTPS--> UpdateAttribute --> PutHDFS flow in order to read json files from an API every lets say 30 secs and put the files in HDFS. customName, to the processor and reference the old attribute using the NiFi Expression Language: ${JsonAttribute} In that case you may also simplify your deletion regex to also delete the JsonAttribute flow file attribute: Jul 22, 2023 · The NiFi JoltTransform uses the powerful Jolt language to parse JSON. Sep 20, 2018 · The answer above by Shu is correct for how to manipulate the filename attribute in NiFi, but if you have already written a file to HDFS and then use UpdateAttribute, it is not going to change the name of the file in HDFS, it will only change the value of the filename attribute in NiFi. Properties: In the list below, the names of required properties appear in bold. However when I use the ExecuteSQL_main process Feb 3, 2018 · this expression routes only when both id,age attributes are empty. Mar 21, 2017 · You have to use the updateAttribute to store the 'Incoming. So you can just set property name of UpdateAttribute as uuid and value as ${filename} or just the filename you wish to put and it should do the job. but it is getting inserted as new value at the end of the json instead of searching the version and changing the corresponding value. Some general purpose processors include: UpdateAttribute - Updates attributes on flow files using both static values and NiFi's expression language. May 7, 2018 · In this field value we are concatenating id,filename,state,UUID() values with - to make the value unique and assigning the value to unique_id field. As an example, to alter the standard “filename” attribute so that it has “. ${filename:contains(${fileStartsWith:append(${date})})} You cann't be concat with '+' in Nifi. xrvrxfrpqkshbgzhupihetkpqyvnekevzckrialepau