Lin Yiqun created HDFS-9747:
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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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