Vishal Kuo created SAMZA-935:
--------------------------------
Summary: hello-samza add kafka wait for dependent services
Key: SAMZA-935
URL: https://issues.apache.org/jira/browse/SAMZA-935
Project: Samza
Issue Type: Improvement
Components: hello-samza
Reporter: Vishal Kuo
Priority: Minor
When working with a modified bin/grid script found in
https://github.com/theduderog/hello-samza-confluent we found that attempting to
start confluent's schemaregistry service immediately after starting the other
services resulted in failure since schemaregistry is dependent on kafka which
takes a couple seconds to start up.
Would it make sense to add a wait option for kafka like we have added here:
https://github.com/theduderog/hello-samza-confluent/blob/master/bin/grid#L118-L132
?
```
wait_kafka() {
echo "Waiting for kafka broker to start..."
until $(nc -w 2 localhost 9092); do
printf '.'
sleep 1
done
printf '\n'
echo "Kafka broker is listening";
}
```
This way, dependent services started right after ./bin/grid bootsrap won't fail
intermittently.
I don't mind adding this if it can be considered useful.
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