[jira] [Created] (HDFS-10556) DistCpOptions should be validated automatically

["Mingliang Liu (JIRA)" <ji...@apache.org>]

Mingliang Liu created HDFS-10556:
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             Summary: DistCpOptions should be validated automatically
                 Key: HDFS-10556
                 URL: https://issues.apache.org/jira/browse/HDFS-10556
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.8.0
            Reporter: Mingliang Liu
            Assignee: Mingliang Liu


{{DistCpOptions}} can be set from command-line or may be set manually. In [HDFS-10397], we refactored the validation to make it simpler and more efficient. However, the newly added {{validate()}} method may not be automatically revoked. This is the major concern for existing downstreams that create the {{DistCpOptions}} manually instead of by parser, and have conflicting options.

This jira is to make the validation happen automatically. A simple fix is to use the approach that validates in individual setters. This is a fix for {{branch-2}}. As a long-term fix, in [HDFS-10533], we're making the {{DistCpOptions}} immutable so that it will be hard, if not impossible, to use it wrongly by downstream applications. However, that code will only go to {{trunk}} branch as it breaks backwards-compatibility.



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