cloventt opened a new pull request #10595:
URL: https://github.com/apache/druid/pull/10595


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   ### Description
   
   <!-- Describe the goal of this PR, what problem are you fixing. If there is 
a corresponding issue (referenced above), it's not necessary to repeat the 
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   Previously, when the Docker entrypoint script generated the config files, it 
would append the configuration without including a newline. This could result 
in incorrect configuration. This has been fixed by always appending a newline 
before any edited configuration.
   
   For example, if a variable was set in Docker to change the zookeeper URL to 
`zookeeper`, the script would edit the `_common/common.runtime.properties` file 
so that the last line looked like this:
   
   ```
   druid.lookup.enableLookupSyncOnStartup=falsedruid.zk.service.host=localhost
   ```
   
   On startup, Druid would crash because it would try to parse the string 
`falsedruid.zk.service.host=localhost` as a Boolean.
   
   After this change, the script now correctly outputs this at the end of the 
file:
   
   ```
   druid.lookup.enableLookupSyncOnStartup=false
   druid.zk.service.host=localhost
   ```
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   <hr>
   
   This PR has:
   - [x] been self-reviewed.
   - [x] been tested in a test Druid cluster.
   
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