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https://issues.apache.org/jira/browse/HDFS-11712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15986754#comment-15986754
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Yiqun Lin edited comment on HDFS-11712 at 4/27/17 2:51 PM:
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While working on this, I found that ozone is still using the old jackson
version API. And {{ObjectMapper}} is under the package
{{org.codehaus.jackson.map.ObjectMapper}}, however jackson version has been
upgraded to jackson2 across project. In the latest patch, I have upgraded most
of places which using the old {{ObjectMapper}}. Only some few places I didn't
update since I haven't find corresponding APIs in new version.
Attach the patch.
was (Author: linyiqun):
While woking on this, I found that ozone is still using the old jackson version
API. And {{ObjectMapper}} is under the package
{{org.codehaus.jackson.map.ObjectMapper}}, however jackson version has been
upgraded to jackson2. In the latest patch, I have upgraded most of places which
using the old {{ObjectMapper}}.
Attach the patch.
> Ozone: Reuse ObjectMapper instance to improve the performance
> -------------------------------------------------------------
>
> Key: HDFS-11712
> URL: https://issues.apache.org/jira/browse/HDFS-11712
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Yiqun Lin
> Assignee: Yiqun Lin
> Attachments: HDFS-11712-HDFS-7240.001.patch
>
>
> In the ozone, there are many places using {{ObjectMapper}} to do the
> object-json transformation. From the page of {{ObjectMapper}}
> (https://github.com/FasterXML/jackson-docs/wiki/Presentation:-Jackson-Performance),
> {{ObjectMapper}} is a heavy-weight object, it not a good bevahiour to
> create this instance everywhere.
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