avrow | pure Rust implementation of the avro specification https | Serialization library
kandi X-RAY | avrow Summary
kandi X-RAY | avrow Summary
Avrow is a pure Rust implementation of the Avro specification: a row based data serialization system. The Avro data serialization format finds its use quite a lot in big data streaming systems such as Kafka and Spark. Within avro's context, an avro encoded file or byte stream is called a "data file". To write data in avro encoded format, one needs a schema which is provided in json format. Here's an example of an avro schema represented in json:. The above schema is of type record with fields and represents a linked list of 64-bit integers. In most implementations, this schema is then fed to a Writer instance along with a buffer to write encoded data to. One can then call one of the write methods on the writer to write data. One distinguishing aspect of avro is that the schema for the encoded data is written on the header of the data file. This means that for reading data you don't need to provide a schema to a Reader instance. The spec also allows providing a reader schema to filter data when reading.
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QUESTION
Sorry for my noob rust question.
I'm working on a project regarding avro file manipulation tool based on avrow. I see the popular compile error happen on header reading. I see avrow_cli works good but I don't understand why avrow_cli handles that well. Could someone please point out what's wrong? Thank you.
Below is a piece of code and error msg.
...ANSWER
Answered 2021-Jun-20 at 15:42OpenOptions::open()
returns a io::Result
instead of just File
. You have to check if the open()
operation was successful before being able to work with the file.
The simplest way to get the file is to call .unwrap()
or .expect()
on the result, which will cause the application to panic (i.e. crash) in case open()
returned an error
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Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.
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