elek commented on a change in pull request #773: HDDS-1469. Generate default
configuration fragments based on annotations
URL: https://github.com/apache/hadoop/pull/773#discussion_r278874474
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File path:
hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/conf/OzoneConfiguration.java
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@@ -161,14 +285,14 @@ public static void activate() {
Configuration.addDefaultResource("hdfs-default.xml");
Configuration.addDefaultResource("hdfs-site.xml");
Configuration.addDefaultResource("ozone-default.xml");
- Configuration.addDefaultResource("ozone-site.xml");
Review comment:
We should. But in fact I didn't remove the possibility to use ozone-site.xml
I just _moved_ it.
The problem here is that the hadoop Configuration is not designed to be
reused. We can use multiple `Configuration.addDefaultResource(String)` but
there is no `Configuration.addDefaultResource(URL)` (and we can't create one as
all the required methods are private :-( ).
With using configuration fragments we have multiple files with the same name
(String) but with different URL (eg.
jar://hadoop-ozone-ozone-manager.jar!/ozone-default-generated.xml).
To support this, but _keep_ the same precedence I modified the configuration
loading:
```
Configuration.addDefaultResource("hdfs-default.xml");
Configuration.addDefaultResource("hdfs-site.xml");
Configuration.addDefaultResource("ozone-default.xml");
conf.addResource("jar://ozone-manager.jar!/ozone-site-generated.xml");
conf.addResource("jar://storage-container-manager.jar!/ozone-site-generated.xml");
conf.addResource("ozone-site.xml");
```
The last three lines are in the constructor of OzoneConfiguration and as I
would like to load `ozone-site.xml ` at the end I moved it to there.
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