The Avro Enchiridion

Enchiridion: A small manual or handbook. It's a bit like a tech cook book, but a bigger, fancier, SEO-optimizabler word.

This project describes how to do many common Java tasks using the Avro serialization library.

The main project uses the latest release of Avro 1.11.0, but includes modules that run the same tests on previous versions of Avro.

Modules

module	description
avro-resources	Reusable resources for testing Avro (Schema JSON strings, etc).
core	Unit tests and examples for the Avro Java SDK.
core17x	Helper project for running tests in Avro 1.7.x
core18x	Helper project for running tests in Avro 1.8.x
core19x	Helper project for running tests in Avro 1.9.x
core-master-snapshot	Helper project for running tests in the latest SNAPSHOT releases from the Avro master branch.
ipc	Unit tests and examples for client/server communication with Avro protocols.
plugin	Using the maven plugin to generate Avro classes.

Java Topics

I want to...	See...
Read/write one datum to a byte array	SerializeToBytesTest
Read/write one datum to a ByteBuffer	SerializeToBytesTest
Read/write one datum to an Avro JSON String	SerializeToJsonTest
Read from/write to an Avro file	AvroFileTest
Append a record to an Avro file	AvroFileTest

Logical Types (spec)

I want to...	See...
Use BigDecimal datum with a GenericData model	DecimalPrecisionAndScaleTest (see the static block)
Create my own logical type	TODO

Schema resolution (spec)

I want to...	See...
Evolve my schema by adding a field	EvolveAddAFieldTest
... by removing a field	EvolveRemoveAFieldTest
... by renaming a field	EvolveRenameAFieldTest
... by reordering fields	EvolveReorderFieldsTest
... by widening a primitive	EvolveWidenPrimitivesTest
... by adding a union	EvolveUnionTest
... by adding an enum symbol
... by removing an enum symbol

Building an Apache Avro SNAPSHOT locally.

# Get the Avro source code.
git clone git@github.com:apache/avro.git

# Create an Avro docker image with all of the necessary tools. 
cd avro
./build.sh docker

# Run a container with your local .m2 mounted
docker run --rm -t -i \
  -v $PWD:$HOME/avro -w $HOME/avro \
  -v $HOME/.m2:$HOME/.m2 \
  -u $USER avro-build-$USER \
  ./build.sh test

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