Make sure you have avro-tools installed.
brew install avro-tools
# or...
mvn dependency:get -Dartifact=org.apache.avro:avro-maven-plugin:1.8.2
cp ~/.m2/repository/org/apache/avro/avro-tools/1.8.2/avro-tools-1.8.2.jar /usr/local/bin/avro-tools
Find the file you want to download:
gsutil ls gs://bucket
Download the Avro file to a local directory:
gsutil cp gs://bucket/objectname.avro ~/Downloads/example.avro
Read using avro-tools:
# update this as needed.
avro-tools tojson example.avro | head -n1 | jq '.emails'