Andrew Wang created HDFS-13601:
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             Summary: Optimize ByteString conversions in PBHelper
                 Key: HDFS-13601
                 URL: https://issues.apache.org/jira/browse/HDFS-13601
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.9.1, 3.1.0
            Reporter: Andrew Wang
            Assignee: Andrew Wang


While doing some profiling of the NN with JMC, I saw a lot of time being spent 
on String->ByteString conversions. These are often the same strings being 
converted over and over again, meaning there's room for optimization.



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