I have a JSON file. I'm looking for any program/tool which helps to generate AVRO schema based on that JSON file. I do not care about the data type. It can all be string as long as the AVRO schema structure is generated based on JSON.
The objective is, I'm trying to create a avro file using only json file. To do this, I would require avro schema.
so if I have an avro schema, using avro-tool, I'll be able to generate AVRO file by giving Avro schema and JSON file as input.
Any help/suggestions to proceed further will be greatly appreciated.
Thanks in Advance!
https://github.com/romaanankin/avro-schema-manager
you can generate in from a simple .CSV. Just use the tool above
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I need some guidance on how to proceed with a problem.
Our integration team receives xml files which are converted to json and sent to pub/sub. We then ingest the json files (or are supposed to) into bigquery.
The problem is that the xml files do not include all possible objects or values all the time. So, I cant create a correct schema in bq to receive the json files. I got the xsd file with an extension file which gives me all possible objects but I don't know how to convert this to a correct bq schema.
Do you have any suggestions on how to create a bq schema from xsd files? I was thinking that if I create an xml file with dummy data (including all objects and more than one object when creating repeated objects) with help of the xsd maybe that xml file may be converted to json and then use the auto-schema detection of bq.
Any suggestions?
Thanks,
Cris
If you have the XSD schema files, you can convert these to a valid JSON schema. There are a few tools that can help you to accomplish this.
Keep in mind that the tools are for general purposes and not for the particular case of BigQuery, so you'll have to tune the result to get a valid JSON schema. For this check the components of a BigQuery schema, and for quick reference the sample provided in the documentation.
I want to convert JSON files to CSV in nifi. We can achieve this in Python and other programming languages and have multiple articles on it. I have multiple JSON files and each file has different schema(one specific file will have one schema only). I can see there are templates to convert CSV to JSON and other conversions. But I didn't see any template to convert JSON data to CSV. I have gone through the article https://community.hortonworks.com/articles/64069/converting-a-large-json-file-into-csv.html ,however here we are hard coding the schema. As I have multiple files and each file has different schema, I can't hardcode the schema. Any suggestions please.
Conversion between formats is typically done through ConvertRecord by plugging in the appropriate record reader and record writer, in this case a JSON reader and CSV writer.
To make use of the record processors you need to defined Avro schemas for your data and put them in a schema registry, NiFi provides a local one.
There are lots of examples and posts out there about the record stuff, this slide deck shows an example of CSV to JSON, but would be easy to reverse the situation for your scenario:
https://www.slideshare.net/BryanBende/apache-nifi-record-processing
This post has some other info:
https://bryanbende.com/development/2017/06/20/apache-nifi-records-and-schema-registries
I want to convert a JSON object to PDF such that the resultant PDF contains Tree representation of JSON. Please help me with any online utility or tool for it.
You can use the ObjectMapper in JAVA, then create the PDF File of it.or you can use this link for online :https://mygeodata.cloud/converter/json-to-pdf
The avro format is used in hadoop as a header to describe the contents of the binary file that follows. My question is whether the json part of the avro file can be extended to include information that is not necessary for hadoop? The typical use case would be to attach meta-data like the originator of the file and a date to the file without it needing to be data and part of the file.
Yes. Avro files can be annotated with additional information in the json schema or with specific additional name:value pairs. Additionally, we have been able to read these avro files with Pentaho and Google Big Query. One caveat is that the schema and name:value pairs are discarded during the import process. So if you feel you will need them later, you should extract and store local copies of them.
I'm looking for a library that would convert a JSON to a schema.
jsonschema.net is an online tool, but what I want is a library I could use in my code. Similarly, to convert CSV and TSV to JSON schema as well.
Feel free to contribute to Schemify . Demo on Demo page.