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https://issues.apache.org/jira/browse/HDFS-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15129872#comment-15129872
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Lin Yiqun commented on HDFS-9747:
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Who can help me to transfer this jira to MAPREDUCE, thanks.
> 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
> Attachments: MAPREDUCE.001.patch
>
>
> 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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