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https://issues.apache.org/jira/browse/HADOOP-3822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618654#action_12618654
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Steve Loughran commented on HADOOP-3822:
----------------------------------------
This is what an @Internal attribute would look like
@Retention(RetentionPolicy.SOURCE)
public @interface Internal {
String value() default "";
}
It could then be used to annotate classes, methods, interfaces, etc
@Internal
public interface HealthChecks {
boolean healthy() throws IOException;
}
Even member variables you want better access to
public class NameNode {
@Internal("namesystem should be accessed through getNamesystem()");
FSNamesystem namesystem;
....
}
The attribute would not do anything, except to say "be careful when you use
this, we may change it"
> Create a public scheduler API
> -----------------------------
>
> Key: HADOOP-3822
> URL: https://issues.apache.org/jira/browse/HADOOP-3822
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: Tom White
> Fix For: 0.19.0
>
> Attachments: hadoop-3822.patch, hadoop-3822.sh
>
>
> The work in HADOOP-3412 provided an API to support pluggable schedulers.
> However implementations have to be in the org.apache.hadoop.mapred package,
> which is undesirable. The goal of this issue is to create a public API for
> scheduler writers to code against.
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