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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10560) DiskBalancer: Reuse ObjectMapper instance to improve the performance
Date Thu, 23 Jun 2016 21:11:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15347194#comment-15347194

Anu Engineer commented on HDFS-10560:

[~linyiqun] Thank you for updating the patch. +1, LGTM. [~arpitagarwal] asked to freeze all
check-ins in this branch till he finishes merge. So we will merge this into trunk as soon
as this branch is merged.

> DiskBalancer: Reuse ObjectMapper instance to improve the performance
> --------------------------------------------------------------------
>                 Key: HDFS-10560
>                 URL: https://issues.apache.org/jira/browse/HDFS-10560
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer & mover
>    Affects Versions: HDFS-1312
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>         Attachments: HDFS-10560-HDFS-1312.001.patch, HDFS-10560-HDFS-1312.002.patch,
> In branch HDFS-1312, there are many places use {{ObjectMapper}} instances to do the json-object
transform. But {{ObjectMapper}} instance is relatively heavy, we should reuse them as possible.
And In addition, {{ObjectMapper}} is thread safe, can see this link:http://wiki.fasterxml.com/JacksonFAQ.
> Here are related issues: HDFS-9724, HDFS-9768. We can see detail info in this issues.

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