[jira] [Commented] (HDFS-11233) Fix javac warnings related to the deprecated APIs after upgrading Jackson

["Yiqun Lin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-11233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15743894#comment-15743894 ] 

Yiqun Lin commented on HDFS-11233:
----------------------------------

Thanks for the review and commit the patch. 
{quote}
Hi Yiqun Lin, would you provide a patch for branch-2?
{quote}
I am preparing to provide the patch for branch-2, but I found the Jackson version in branch-2 is 1.9.13 and there aren't {{ObjectReader#readerFor(Class<?> type)}} and {{ObjectWriter#writerFor(JavaType)}}.

> Fix javac warnings related to the deprecated APIs after upgrading Jackson
> -------------------------------------------------------------------------
>
>                 Key: HDFS-11233
>                 URL: https://issues.apache.org/jira/browse/HDFS-11233
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>             Fix For: 3.0.0-alpha2
>
>         Attachments: HDFS-11233.001.patch
>
>
> After HADOOP-12705, the Jackson version upgraded from 2.2.3 to 2.7.8. This lead many APIs which we are used in hadoop being deprecated. Since 2.5, these two APIs are deprecated: {{ObjectReader#readerFor(Class<?> type)}},{{ObjectWriter#writerWithType(JavaType rootType)}}(http://fasterxml.github.io/jackson-databind/javadoc/2.6/com/fasterxml/jackson/databind/ObjectMapper.html).
> According to the doc of ObjectMapper, we can use {{ObjectReader#readerFor(Class<?> type)}} and {{ObjectWriter#writerFor(JavaType)}} instead.



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