payert opened a new pull request #3290:
URL: https://github.com/apache/ambari/pull/3290
When installing Druid the `druid.emitter.ambari-metrics.hostname` property
is set to the first character of the hostname of the AMS collector host even
though the property in Ambari is set to `metric_collector_host`.
/etc/druid/conf/_common/common.runtime.properties file contains:
```
druid.emitter=ambari-metrics
druid.emitter.ambari-metrics.eventConverter={"type":"whiteList"}
druid.emitter.ambari-metrics.hostname=c
druid.emitter.ambari-metrics.port=6188
druid.emitter.ambari-metrics.protocol=https
druid.emitter.ambari-metrics.trustStorePassword=clientTrustStorePassword
druid.emitter.ambari-metrics.trustStorePath=/etc/security/clientKeys/all.jks
druid.emitter.ambari-metrics.trustStoreType=jks
```
## What changes were proposed in this pull request?
The extraction of the first hostname from the list if metric collector hosts
has been fixed.
## How was this patch tested?
Tested manually by installing/restarting Druid when one, two or zero Metrics
Collector is present in the cluster and watched the content of
'/etc/druid/conf/_common/common.runtime.properties' file.
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