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https://issues.apache.org/jira/browse/HDFS-9768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15145732#comment-15145732
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Lin Yiqun commented on HDFS-9768:
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Thanks [~ajisakaa] for commit!
> 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
> Fix For: 2.8.0
>
> Attachments: HDFS-9768.001.patch, HDFS-9768.002.patch,
> HDFS-9768.003.patch
>
>
> 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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