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https://issues.apache.org/jira/browse/CASSANDRA-20249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-20249:
--------------------------------------------
    Summary: Add a check that properties defined in Config.java but not 
mentioned in cassandra.yaml  (was: Add a check what properties defined in 
Config.java but not mentioned in cassandra.yaml)

> Add a check that properties defined in Config.java but not mentioned in 
> cassandra.yaml
> --------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-20249
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20249
>             Project: Apache Cassandra
>          Issue Type: Task
>          Components: Build
>            Reporter: Dmitry Konstantinov
>            Priority: Normal
>         Attachments: config_discrepancy.txt
>
>
> Triggered by https://lists.apache.org/thread/ror3ynqthssf4yghq3o2hlbd9jyx8y0l
> It is quite frequent case when a new property is added to Config.java but not 
> mentioned in cassandra.yaml and cassandra_latest.yaml. Sometimes, it is made 
> intentionally for some non-public parameters.
> We need to find a way to detect such discrepancies between Config.java vs 
> cassandra.yaml and cassandra_latest.yaml automatically.
> A sketch of the check idea:
> {code}
> String configUrl = "file:///..cassandra-trunk/conf/cassandra.yaml";
> Field[] allFields = Config.class.getFields();
> List<String> topLevelPropertyNames = new ArrayList<>();
> for(Field field : allFields)
> {
>     if (!Modifier.isStatic(field.getModifiers()))
>     {
>         topLevelPropertyNames.add(field.getName());
>     }
> }
> URL url = new URL(configUrl);
> List<String> lines = Files.readAllLines(Paths.get(url.toURI()));
> int missedCount = 0;
> for (String propertyName : topLevelPropertyNames)
> {
>     boolean found = false;
>     for (String line : lines)
>     {
>         if (line.startsWith(propertyName + ":")
>             || line.startsWith("#" + propertyName + ":")
>             || line.startsWith("# " + propertyName + ":")) {
>             found = true;
>             break;
>         }
>     }
>     if (!found)
>     {
>         missedCount++;
>         System.out.println(propertyName);
>     }
> }
> System.out.println("Total missed:" + missedCount);
> {code}
> Output example:  [^config_discrepancy.txt] 



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