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Posted to commits@samza.apache.org by "Vishal Kuo (JIRA)" <ji...@apache.org> on 2016/04/15 04:47:25 UTC
[jira] [Updated] (SAMZA-935) hello-samza add kafka wait for
dependent services
[ https://issues.apache.org/jira/browse/SAMZA-935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vishal Kuo updated SAMZA-935:
-----------------------------
Description:
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 ?
{code}
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";
}
{code}
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.
was:
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.
> 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 ?
> {code}
> 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";
> }
> {code}
> 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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