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https://issues.apache.org/jira/browse/HDFS-10533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15332569#comment-15332569
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Chris Nauroth commented on HDFS-10533:
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Is this targeted to 3.0.0-alpha1 so that there is freedom to make a
backward-incompatible change? If so, then I know at least Hive and Falcon
would be impacted, and possibly Oozie too.
https://github.com/apache/hive/blob/release-2.0.1/shims/0.23/src/main/java/org/apache/hadoop/hive/shims/Hadoop23Shims.java#L1262-L1279
https://github.com/apache/falcon/blob/release-0.9-rc0/replication/src/main/java/org/apache/falcon/replication/FeedReplicator.java#L187-L239
https://github.com/apache/oozie/blob/release-4.2.0/sharelib/distcp/src/main/java/org/apache/oozie/action/hadoop/DistcpMain.java#L74-L96
If downstream projects expect a stable interface, then we should update the
interface audience and stability annotations too.
> Make DistCpOptions class immutable
> ----------------------------------
>
> Key: HDFS-10533
> URL: https://issues.apache.org/jira/browse/HDFS-10533
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: distcp
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
>
> Currently the {{DistCpOptions}} class encapsulates all DistCp options, which
> may be set from command-line (via the {{OptionsParser}}) or may be set
> manually (eg construct an instance and call setters). As there are multiple
> option fields and more (e.g. [HDFS-9868], [HDFS-10314]) to add, validating
> them can be cumbersome. Ideally, the {{DistCpOptions}} object should be
> immutable. The benefits are:
> # {{DistCpOptions}} is simple and easier to use and share, plus it scales well
> # validation is automatic, e.g. manually constructed {{DistCpOptions}} gets
> validated before usage
> # validation error message is well-defined which does not depend on the order
> of setters
> This jira is to track the effort of making the {{DistCpOptions}} immutable by
> using a Builder pattern for creation.
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