Lin Yiqun created HDFS-9768:
-------------------------------

             Summary: Reuse objectMapper instance in HDFS to improve the 
performance
                 Key: HDFS-9768
                 URL: https://issues.apache.org/jira/browse/HDFS-9768
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: performance
    Affects Versions: 2.7.1
            Reporter: Lin Yiqun
            Assignee: Lin Yiqun


In HDFS-9724, it have reused the ObjectMapper instance to improve the 
performance in {{WebHDFS}}. But in other places, it still using ObjectMapper by 
{{new ObjectMapper()}}. We probably need a comprehensive review across the 
whole codebase to look for this pattern and modify them. In MAPREDUCE-6626, 
YARN-4668, these jiras also work for this.



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