[HDFS-5236] Change PathBasedCacheDirective APIs to be a single value rather than batch

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: HDFS-4949
• Fix Version/s: HDFS-4949
• Component/s: datanode, namenode
• Assignee: Andrew Wang
• Reporter: Andrew Wang
• Created: 19/Sep/13 23:13
• Updated: 27/Sep/13 22:11
• Resolved: 21/Sep/13 00:23

Description

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.

Issue Links

• breaks: HDFS-5269 Attempting to remove a cache directive fails with NullPointerException.