Andrew Wang created HDFS-5236:
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             Summary: Change PathBasedCacheDirective APIs to be a single value 
rather than batch API
                 Key: HDFS-5236
                 URL: https://issues.apache.org/jira/browse/HDFS-5236
             Project: Hadoop HDFS
          Issue Type: Sub-task
    Affects Versions: HDFS-4949
            Reporter: Andrew Wang
            Assignee: Andrew Wang


It's kind of awkward that APIs like {{addPathBasedCacheDirective}} take a list 
of Directives and return a list of Fallibles, since end users don't see a 
checked exception and need to check each Fallible. It also complicates HDFS 
code. Let's think about switching these APIs to instead take only a single 
Directive.

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