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From "Lin Yiqun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9747) Reuse objectMapper instance in MapReduce
Date Wed, 03 Feb 2016 06:06:39 GMT
Lin Yiqun created HDFS-9747:
-------------------------------

             Summary: Reuse objectMapper instance in MapReduce
                 Key: HDFS-9747
                 URL: https://issues.apache.org/jira/browse/HDFS-9747
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: performance
    Affects Versions: 2.7.1
            Reporter: Lin Yiqun
            Assignee: Lin Yiqun


Now in MapReduce, there are some places creating a new ObjectMapper instance every time. In
wiki of ObjectMapper, it suggested:
{code}
Further: it is beneficial to use just one instance (or small number of instances) for data
binding; many optimizations for reuse (of symbol tables, some buffers) depend on ObjectMapper
instances being reused. 
{code}
http://webcache.googleusercontent.com/search?q=cache:kybMTIJC6F4J:wiki.fasterxml.com/JacksonFAQ+&cd=4&hl=ja&ct=clnk&gl=jp,
it's similar to HDFS-9724.



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