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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10560) DiskBalancer: Reuse ObjectMapper instance to improve the performance
Date Tue, 16 Aug 2016 17:26:22 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anu Engineer updated HDFS-10560:
--------------------------------
      Resolution: Fixed
    Hadoop Flags: Reviewed
          Status: Resolved  (was: Patch Available)

[~linyiqun] Thanks for the contribution. [~ajisakaa], [~jojochuang] Thanks for the reviews
and comments. I have committed this to trunk.

> 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,
HDFS-10560-HDFS-1312.003.patch, HDFS-10560.004.patch, HDFS-10560.005.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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