[
https://issues.apache.org/jira/browse/MAPREDUCE-6626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15139317#comment-15139317
]
Akira AJISAKA commented on MAPREDUCE-6626:
------------------------------------------
Committed this to trunk, branch-2, and branch-2.8. Thanks [~linyiqun] for
creating patches and thanks [~brahmareddy] for the review.
> Reuse ObjectMapper instance in MapReduce
> ----------------------------------------
>
> Key: MAPREDUCE-6626
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6626
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: performance
> Affects Versions: 2.7.1
> Reporter: Lin Yiqun
> Assignee: Lin Yiqun
> Priority: Minor
> Fix For: 2.8.0
>
> Attachments: MAPREDUCE-6626.002.patch, MAPREDUCE-6626.003.patch,
> MAPREDUCE-6626.004.patch, 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
