Simon0806 edited a comment on pull request #897:
URL: https://github.com/apache/hadoop-ozone/pull/897#issuecomment-624422878
> Hi @Simon0806
> Thanks for the contribution and welcome to Ozone.
>
> OzoneConfiguration() calls loadDefaults() and in loadDefaults() we add
ozone-site.xml.
> I see this has been already taken care of by the below code.
>
> ```
> public OzoneConfiguration() {
> OzoneConfiguration.activate();
> loadDefaults();
> }
> ```
>
> ```
> private void loadDefaults() {
> try {
> //there could be multiple ozone-default-generated.xml files on the
> // classpath, which are generated by the annotation processor.
> // Here we add all of them to the list of the available
configuration.
> Enumeration<URL> generatedDefaults =
> OzoneConfiguration.class.getClassLoader().getResources(
> "ozone-default-generated.xml");
> while (generatedDefaults.hasMoreElements()) {
> addResource(generatedDefaults.nextElement());
> }
> } catch (IOException e) {
> e.printStackTrace();
> }
> addResource("ozone-site.xml");
> }
> ```
Hi Bharat
Actually it's true but they are different behaviors. the line you mentioned
was add ozone-site.xml into resources belong to OzoneConfiguration but will not
add ozone-site.xml into defaultResources belong to Configuration. The
initialize process of S3Gateway will use UserGroupInformation.isSecurityEnable
to check if security has been configured.
Here is the key point code:
```
private static void ensureInitialized() {
if (!isInitialized()) {
synchronized(UserGroupInformation.class) {
if (!isInitialized()) { // someone might have beat us
initialize(new Configuration(), false);
}
}
}
}
```
Here it called new Configuration() which will load defaultResources, which
only contains
core-site.xml, hdfs-site.xml, core-default.xml, hdfs-default.xml and
ozone-default.xml.
While when initializing OM and SCM it will pass the OzoneConfiguration to do
initialize but S3Gateway it use Configuration by default.
Or I can call a UserGroupInformation.setConfiguration(conf) when startup a
S3Gateway service to pass the OzoneConfiguration to UserGroupInformation.
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