Harsh J created HADOOP-8323:
-------------------------------

             Summary: Revert HADOOP-7940
                 Key: HADOOP-8323
                 URL: https://issues.apache.org/jira/browse/HADOOP-8323
             Project: Hadoop Common
          Issue Type: Bug
          Components: io
    Affects Versions: 2.0.0
            Reporter: Harsh J
            Assignee: Harsh J
            Priority: Critical


Per [~jdonofrio]'s comments on HADOOP-7940, we should revert it as it has 
caused a performance regression (for scenarios where Text is reused, popular in 
MR).

The clear() works as intended, as the API also offers a current length API.

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